(a) When is the special notice for repeated failure to monitor to be given? The owner or operator of a community or non-community water system that is required to monitor source water under Sec. 141.701 must notify persons served by the water system that monitoring has not been completed as specified no later than 30 days after the system has failed to collect any 3 months of monitoring as specified in Sec. 141.701(c). The notice must be repeated as specified in Sec. 141.203(b).
(b) When is the special notice for failure to determine bin classification or mean Cryptosporidium level to be given? The owner or operator of a community or non-community water system that is required to determine a bin classification under Sec. 141.710, or to determine mean Cryptosporidium level under Sec. 141.712, must notify persons served by the water system that the determination has not been made as required no later than 30 days after the system has failed report the determination as specified in Sec. 141.710(e) or Sec. 141.712(a), respectively. The notice must be repeated as specified in Sec. 141.203(b). The notice is not required if the system is complying with a State-approved schedule to address the violation.
(c) What is the form and manner of the special notice? The form and manner of the public notice must follow the requirements for a Tier 2 public notice prescribed in Sec. 141.203(c). The public notice must be presented as required in Sec. 141.205(c).
(d) What mandatory language must be contained in the special notice? The notice must contain the following language, including the language necessary to fill in the blanks.
(1) The special notice for repeated failure to conduct monitoring must contain the following language:
We are required to monitor the source of your drinking water for Cryptosporidium. Results of the monitoring are to be used to determine whether water treatment at the (treatment plant name) is sufficient to adequately remove Cryptosporidium from your drinking water. We are required to complete this monitoring and make this determination by (required bin determination date). We ``did not monitor or test'' or ``did not complete all monitoring or testing'' on schedule and, therefore, we may not be able to determine by the required date what treatment modifications, if any, must be made to ensure adequate Cryptosporidium removal. Missing this deadline may, in turn, jeopardize our ability to have the required treatment modifications, if any, completed by the deadline required, (date).
For more information, please call (name of water system contact) of (name of water system) at (phone number).
(2) The special notice for failure to determine bin classification or mean Cryptosporidium level must contain the following language:
We are required to monitor the source of your drinking water for Cryptosporidium in order to determine by (date) whether water treatment at the (treatment plant name) is sufficient to adequately remove Cryptosporidium from your drinking water. We have not made this determination by the required date. Our failure to do this may jeopardize our ability to have the required treatment modifications, if any, completed by the required deadline of (date). For more information, please call (name of water system contact) of (name of water system) at (phone number).
(3) Each special notice must also include a description of what the system is doing to correct the violation and when the system expects to return to compliance or resolve the situation. [71 FR 768, Jan. 5, 2006]
Appendix A to Subpart Q of Part 141--NPDWR Violations and Other
Situations Requiring Public Notice \1\ ----------------------------------------------------------------------------------------------------------------
MCL/MRDL/TT violations \2\ Monitoring & testing procedure
-------------------------------------- violations
Contaminant -------------------------------------
Tier of public Citation Tier of public
notice required notice required Citation----------------------------------------------------------------------------------------------------------------I. Violations of National Primary
Drinking Water Regulations (NPDWR):
\3\................................A. Microbiological Contaminants.....
1.a Total coliform bacteria 2 141.63(a) 3 141.21(a)-(e).
dagger;........................
1.b Total coliform (TT 2 141.860(b)(1) 3 141.860(c)(1).
violations resulting from
failure to perform assessments
or corrective actions,
monitoring violations, and
reporting violations) [Dagger].
................. ................. ................. 141.860(d)(1).
1.c Seasonal system failure to 2 141.860(b)(2) 3 141.860(d)(3).
follow State-approved start-up
plan prior to serving water to
the public or failure to
provide certification to State
[Dagger].......................
2.a Fecal coliform/E. coli 1 141.63(b) \4\ 1,3 141.21(e)
dagger;........................
2.b E. coli (MCL, monitoring, 1 141.860 (a) 3 141.860(c)(2)
and reporting violations)
[Dagger].......................
................. ................. ................. 141.860(d)(1).
................. ................. ................. 141.860(d)(2).
2.c E. coli (TT violations 2 141.860(b)(1)
resulting from failure to
perform level 2 Assessments or
corrective action) [Dagger]....
3. Turbidity MCL................ 2 141.13(a) 3 141.22
4. Turbidity MCL (average of 2 \5\ 2, 1 141.13(b) 3 141.22
days' samples 5 NTU)
5. Turbidity (for TT violations \6\ 2, 1 141.71(a)(2), 3 141.74(a)(1),
resulting from a single 141.71(c)(2)(i), 141.74(b)(2),
exceedance of maximum allowable 141.73(a)(2), 141.74(c)(1),
turbidity level)............... 141.73 (b)(2), 141.174,
141.73 (c)(2), 141.560(a)-(c),
141.73(d), 141.561.
141.173(a)(2),
141.173(b),
141.551(b)
6. Surface Water Treatment Rule 2 141.70-141.73 3 141.74
violations, other than
violations resulting from
single exceedance of max.
allowable turbidity level (TT).
7. Interim Enhanced Surface \7\ 2 141.170-141.173, 3 141.172, 141.174,
Water Treatment Rule 141.500-141.553 141.530-141.544,
violations, other than 141.560-141.564.
violations resulting from
single exceedance of max.
turbidity level (TT)...........
8. Filter Backwash Recycling 2 141.76(c) 3 141.76(b), (d)
Rule violations................
9. Long Term 1 Enhanced Surface 2 141.500-141.553 3 141.530-141.544,
Water Treatment Rule violations 141.560-141.564.
10. LT2ESWTR violations......... 2 141.710-141.720 \22\ 2, 3 141.701-141.705
and 141.708-
141.709.
11. Ground Water Rule violations 2 141.404 3 141.402(h),
141.403(d).B. Inorganic Chemicals (IOCs)
1. Antimony..................... 2 141.62(b) 3 141.23(a), (c)
2. Arsenic...................... 2 \8\ 141.62(b) 3 \11\ 141.23(a),
(c)
3. Asbestos (fibers 10 [micro]m)................
4. Barium....................... 2 141.62(b) 3 141.23(a), (c)
5. Beryllium.................... 2 141.62(b) 3 141.23(a), (c)
6. Cadmium...................... 2 141.62(b) 3 141.23(a), (c)
7. Chromium (total)............. 2 141.62(b) 3 141.23(a), (c)
8. Cyanide...................... 2 141.62(b) 3 141.23(a), (c)
9. Fluoride..................... 2 141.62(b) 3 141.23(a), (c)
10. Mercury (inorganic)......... 2 141.62(b) 3 141.23(a), (c)
11. Nitrate..................... 1 141.62(b) \12\ 1, 3 141.23(a), (d),
141.23(f)(2)
12. Nitrite..................... 1 141.62(b) \12\ 1, 3 141.23(a), (e),
141.23(f)(2)
13. Total Nitrate and Nitrite... 1 141.62(b) 3 141.23(a)
14. Selenium.................... 2 141.62(b) 3 141.23(a), (c)
15. Thallium.................... 2 141.62(b) 3 141.23(a), (c)C. Lead and Copper Rule (Action
Level for lead is 0.015 mg/L, for
copper is 1.3 mg/L)
1. Lead and Copper Rule (TT).... 2 141.80-141.85 3 141.86-141.89D. Synthetic Organic Chemicals
(SOCs)
1. 2,4-D........................ 2 141.61(c) 3 141.24(h)
2. 2,4,5-TP (Silvex)............ 2 141.61(c) 3 141.24(h)
3. Alachlor..................... 2 141.61(c) 3 141.24(h)
4. Atrazine..................... 2 141.61(c) 3 141.24(h)
5. Benzo(a)pyrene (PAHs)........ 2 141.61(c) 3 141.24(h)
6. Carbofuran................... 2 141.61(c) 3 141.24(h)
7. Chlordane.................... 2 141.61(c) 3 141.24(h)
8. Dalapon...................... 2 141.61(c) 3 141.24(h)
9. Di (2-ethylhexyl) adipate.... 2 141.61(c) 3 141.24(h)
10. Di (2-ethylhexyl) phthalate. 2 141.61(c) 3 141.24(h)
11. Dibromochloropropane........ 2 141.61(c) 3 141.24(h)
12. Dinoseb..................... 2 141.61(c) 3 141.24(h)
13. Dioxin (2,3,7,8-TCDD)....... 2 141.61(c) 3 141.24(h)
14. Diquat...................... 2 141.61(c) 3 141.24(h)
15. Endothall................... 2 141.61(c) 3 141.24(h)
16. Endrin...................... 2 141.61(c) 3 141.24(h)
17. Ethylene dibromide.......... 2 141.61(c) 3 141.24(h)
18. Glyphosate.................. 2 141.61(c) 3 141.24(h)
19. Heptachlor.................. 2 141.61(c) 3 141.24(h)
20. Heptachlor epoxide.......... 2 141.61(c) 3 141.24(h)
21. Hexachlorobenzene........... 2 141.61(c) 3 141.24(h)
22. Hexachlorocyclo-pentadiene.. 2 141.61(c) 3 141.24(h)
23. Lindane..................... 2 141.61(c) 3 141.24(h)
24. Methoxychlor................ 2 141.61(c) 3 141.24(h)
25. Oxamyl (Vydate)............. 2 141.61(c) 3 141.24(h)
26. Pentachlorophenol........... 2 141.61(c) 3 141.24(h)
27. Picloram.................... 2 141.61(c) 3 141.24(h)
28. Polychlorinated biphenyls 2 141.61(c) 3 141.24(h)
(PCBs).........................
29. Simazine.................... 2 141.61(c) 3 141.24(h)
30. Toxaphene................... 2 141.61(c) 3 141.24(h)E. Volatile Organic Chemicals (VOCs)
1. Benzene...................... 2 141.61(a) 3 141.24(f)
2. Carbon tetrachloride......... 2 141.61(a) 3 141.24(f)
3. Chlorobenzene 2 141.61(a) 3 141.24(f)
(monochlorobenzene)............
4. o-Dichlorobenzene............ 2 141.61(a) 3 141.24(f)
5. p-Dichlorobenzene............ 2 141.61(a) 3 141.24(f)
6. 1,2-Dichloroethane........... 2 141.61(a) 3 141.24(f)
7. 1,1-Dichloroethylene......... 2 141.61(a) 3 141.24(f)
8. cis-1,2-Dichloroethylene..... 2 141.61(a) 3 141.24(f)
9. trans-1,2-Dichloroethylene... 2 141.61(a) 3 141.24(f)
10. Dichloromethane............. 2 141.61(a) 3 141.24(f)
11. 1,2-Dichloropropane......... 2 141.61(a) 3 141.24(f)
12. Ethylbenzene................ 2 141.61(a) 3 141.24(f)
13. Styrene..................... 2 141.61(a) 3 141.24(f)
14. Tetrachloroethylene......... 2 141.61(a) 3 141.24(f)
15. Toluene..................... 2 141.61(a) 3 141.24(f)
16. 1,2,4-Trichlorobenzene...... 2 141.61(a) 3 141.24(f)
17. 1,1,1-Trichloroethane....... 2 141.61(a) 3 141.24(f)
18. 1,1,2-Trichloroethane....... 2 141.61(a) 3 141.24(f)
19. Trichloroethylene........... 2 141.61(a) 3 141.24(f)
20. Vinyl chloride.............. 2 141.61(a) 3 141.24(f)
21. Xylenes (total)............. 2 141.61(a) 3 141.24(f)F. Radioactive Contaminants
1. Beta/photon emitters......... 2 141.66(d) 3 141.25(a)
141.26(b)
2. Alpha emitters............... 2 141.66(c) 3 141.25(a)
141.26(a)
3. Combined radium (226 and 228) 2 141.66(b) 3 141.25(a)
141.26(a)
4. Uranium...................... \9\ 2 141.66(e) \10\ 3 141.25(a)
141.26(a)G. Disinfection Byproducts (DBPs),
Byproduct Precursors, Disinfectant
Residuals. Where disinfection is
used in the treatment of drinking
water, disinfectants combine with
organic and inorganic matter
present in water to form chemicals
called disinfection byproducts
(DBPs). EPA sets standards for
controlling the levels of
disinfectants and DBPs in drinking
water, including trihalomethanes
(THMs) and haloacetic acids (HAAs).
\13\
1. Total trihalomethanes (TTHMs) 2 \14\ 141.64(b) 3 141.132(a)-(b),
141.600-141.605,
141.620-141.629
2. Haloacetic Acids (HAA5)...... 2 141.64(b) 3 141.132(a)-(b),
141.600-141.605,
141.620-141.629
3. Bromate...................... 2 141.64(a) 3 141.132(a)-(b)
4. Chlorite..................... 2 141.64(a) 3 141.132(a)-(b)
5. Chlorine (MRDL).............. 2 141.65(a) 3 141.132(a), (c)
6. Chloramine (MRDL)............ 2 141.65(a) 3 141.132(a), (c)
7. Chlorine dioxide (MRDL), 2 141.65(a), 2 \15\, 3 141.132(a), (c),
where any 2 consecutive daily 141.133(c)(3) 141.133(c)(2)
samples at entrance to
distribution system only are
above MRDL.....................
8. Chlorine dioxide (MRDL), \16\ 1 141.65(a), 1 141.132(a), (c),
where sample(s) in distribution 141.133(c)(3) 141.133(c)(2)
system the next day are also
above MRDL.....................
9. Control of DBP precursors-- 2 141.135(a)-(b) 3 141.132(a), (d)
TOC (TT).......................
10. Bench marking and N/A N/A 3 141.172 141.530-
disinfection profiling......... 141.544.
11. Development of monitoring N/A N/A 3 141.132(f)
plan...........................H. Other Treatment Techniques
1. Acrylamide (TT).............. 2 141.111 N/A N/A
2. Epichlorohydrin (TT)......... 2 141.111 N/A N/AII. Unregulated Contaminant
Monitoring: \17\A. Unregulated contaminants......... N/A N/A 3 141.40B. Nickel........................... N/A N/A 3 141.23(c), (k)III. Public Notification for
Variances and Exemptions:A. Operation under a variance or 3 \18\ 1415, 1416, N/A N/A
exemption..........................B. Violation of conditions of a 2 1415, 1416, \19\ N/A N/A
variance or exemption.............. 142.307IV. Other Situations Requiring
Public Notification:A. Fluoride secondary maximum 3 143.3 N/A N/A
contaminant level (SMCL) exceedanceB. Exceedance of nitrate MCL for non- 1 141.11(d) N/A N/A
community systems, as allowed by
primacy agency.....................C. Availability of unregulated 3 141.40 N/A N/A
contaminant monitoring data........D. Waterborne disease outbreak...... 1 141.2, N/A N/A
141.71(c)(2)(ii)E. Other waterborne emergency \20\.. 1 N/A N/A N/AF. Source Water Sample Positive for 1 141.402(g) N/A N/A
GWR Fecal indicators: E. coli,
enterococci, or coliphage..........G. Other situations as determined by \21\ 1, 2, 3 N/A N/A N/A
primacy agency.....................----------------------------------------------------------------------------------------------------------------
Appendix A--Endnotes
[dagger] Until March 31, 2016.
[Dagger] Beginning April 1, 2016.
1. Violations and other situations not listed in this table (e.g., failure to prepare Consumer Confidence Reports), do not require notice, unless otherwise determined by the primacy agency. Primacy agencies may, at their option, also require a more stringent public notice tier (e.g., Tier 1 instead of Tier 2 or Tier 2 instead of Tier 3) for specific violations and situations listed in this Appendix, as authorized under Sec. 141.202(a) and Sec. 141.203(a).
2. MCL--Maximum contaminant level, MRDL--Maximum residual disinfectant level, TT--Treatment technique
3. The term Violations of National Primary Drinking Water Regulations (NPDWR) is used here to include violations of MCL, MRDL, treatment technique, monitoring, and testing procedure requirements.
4. Failure to test for fecal coliform or E. coli is a Tier 1 violation if testing is not done after any repeat sample tests positive for coliform. All other total coliform monitoring and testing procedure violations are Tier 3.
5. Systems that violate the turbidity MCL of 5 NTU based on an average of measurements over two consecutive days must consult with the primacy agency within 24 hours after learning of the violation. Based on this consultation, the primacy agency may subsequently decide to elevate the violation to Tier 1. If a system is unable to make contact with the primacy agency in the 24-hour period, the violation is automatically elevated to Tier 1.
6. Systems with treatment technique violations involving a single exceedance of a maximum turbidity limit under the Surface Water Treatment Rule (SWTR), the Interim Enhanced Surface Water Treatment Rule (IESWTR), or the Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR) are required to consult with the primacy agency within 24 hours after learning of the violation. Based on this consultation, the primacy agency may subsequently decide to elevate the violation to Tier 1. If a system is unable to make contact with the primacy agency in the 24-hour period, the violation is automatically elevated to Tier 1.
7. Most of the requirements of the Interim Enhanced Surface Water Treatment Rule (63 FR 69477) (Sec. Sec. 141.170-141.171, 141.173-141.174) become effective January 1, 2002 for Subpart H systems (surface water systems and ground water systems under the direct influence of surface water) serving at least 10,000 persons. However, Sec. 141.172 has some requirements that become effective as early as April 16, 1999. The Surface Water Treatment Rule remains in effect for systems serving at least 10,000 persons even after 2002; the Interim Enhanced Surface Water Treatment Rule adds additional requirements and does not in many cases supercede the SWTR.
8. The arsenic MCL citations are effective January 23, 2006. Until then, the citations are Sec. 141.11(b) and Sec. 141.23(n).
9. The uranium MCL Tier 2 violation citations are effective December 8, 2003 for all community water systems.
10. The uranium Tier 3 violation citations are effective December 8, 2000 for all community water systems.
11. The arsenic Tier 3 violation MCL citations are effective January 23, 2006. Until then, the citations are Sec. 141.23(a), (l).
12. Failure to take a confirmation sample within 24 hours for nitrate or nitrite after an initial sample exceeds the MCL is a Tier 1 violation. Other monitoring violations for nitrate are Tier 3.
13. Subpart H community and non-transient non-community systems serving =10,000 must comply with new DBP MCLs, disinfectant MRDLs, and related monitoring requirements beginning January 1, 2002. All other community and non-transient non-community systems must meet the MCLs and MRDLs beginning January 1, 2004. Subpart H transient non-community systems serving 10,000 or more persons and using chlorine dioxide as a disinfectant or oxidant must comply with the chlorine dioxide MRDL beginning January 1, 2002. Subpart H transient non-community systems serving fewer than 10,000 persons and using only ground water not under the direct influence of surface water and using chlorine dioxide as a disinfectant or oxidant must comply with the chlorine dioxide MRDL beginning January 1, 2004.
14. Sec. Sec. 141.64(b)(1) 141.132(a)-(b) apply until Sec. Sec. 141.620-141.630 take effect under the schedule in Sec. 141.620(c).
15. Failure to monitor for chlorine dioxide at the entrance to the distribution system the day after exceeding the MRDL at the entrance to the distribution system is a Tier 2 violation.
16. If any daily sample taken at the entrance to the distribution system exceeds the MRDL for chlorine dioxide and one or more samples taken in the distribution system the next day exceed the MRDL, Tier 1 notification is required. Failure to take the required samples in the distribution system after the MRDL is exceeded at the entry point also triggers Tier 1 notification.
17. Some water systems must monitor for certain unregulated contaminants listed in Sec. 141.40.
18. This citation refers to Sec. Sec. 1415 and 1416 of the Safe Drinking Water Act. Sec. Sec. 1415 and 1416 require that ``a schedule prescribed. . . for a public water system granted a variance [or exemption] shall require compliance by the system. . .''
19. In addition to Sec. Sec. 1415 and 1416 of the Safe Drinking Water Act, 40 CFR 142.307 specifies the items and schedule milestones that must be included in a variance for small systems.
20. Other waterborne emergencies require a Tier 1 public notice under Sec. 141.202(a) for situations that do not meet the definition of a waterborne disease outbreak given in 40 CFR 141.2 but that still have the potential to have serious adverse effects on health as a result of short-term exposure. These could include outbreaks not related to treatment deficiencies, as well as situations that have the potential to cause outbreaks, such as failures or significant interruption in water treatment processes, natural disasters that disrupt the water supply or distribution system, chemical spills, or unexpected loading of possible pathogens into the source water.
21. Primacy agencies may place other situations in any tier they believe appropriate, based on threat to public health.
22. Failure to collect three or more samples for Cryptosporidium analysis is a Tier 2 violation requiring special notice as specified in Sec. 141.211. All other monitoring and testing procedure violations are Tier 3. [65 FR 26035, May 4, 2000, as amended at 65 FR 76750, Dec. 7, 2000; 66 FR 7065, Jan. 22, 2001; 66 FR 31104, June 8, 2001; 67 FR 1836, Jan. 14, 2002; 69 FR 38856, June 29, 2004; 71 FR 483, Jan. 4, 2006; 71 FR 768, Jan. 5, 2006; 71 FR 65652, Nov. 8, 2006; 78 FR 10350, Feb. 13, 2013; 79 FR 10669, Feb. 26, 2014]
Appendix B to Subpart Q of Part 141--Standard Health Effects Language
for Public Notification ----------------------------------------------------------------------------------------------------------------
Standard health effects language for
Contaminant MCLG \1\ mg/L MCL \2\ mg/L public notification----------------------------------------------------------------------------------------------------------------
National Primary Drinking Water Regulations (NPDWR)
A. Microbiological Contaminants----------------------------------------------------------------------------------------------------------------1a. Total coliform [dagger]... Zero See footnote \3\ Coliforms are bacteria that are naturally
present in the environment and are used
as an indicator that other, potentially-
harmful, bacteria may be present.
Coliforms were found in more samples
than allowed and this was a warning of
potential problems.1b. Fecal coliform/E. coli Zero Zero Fecal coliforms and E. coli are bacteria
[dagger]. whose presence indicates that the water
may be contaminated with human or animal
wastes. Microbes in these wastes can
cause short-term effects, such as
diarrhea, cramps, nausea, headaches, or
other symptoms. They may pose a special
health risk for infants, young children,
some of the elderly, and people with
severely compromised immune systems.1c. Fecal indicators (GWR):... Zero TT Fecal indicators are microbes whosei. E. coli.................... None TT presence indicates that the water may beii. enterococci............... None TT contaminated with human or animaliii. coliphage................ wastes. Microbes in these wastes can
cause short-term health effects, such as
diarrhea, cramps, nausea, headaches, or
other symptoms. They may pose a special
health risk for infants, young children,
some of the elderly, and people with
severely compromised immune systems.1d. Ground Water Rule (GWR) TT None TT Inadequately treated or inadequately
violations. protected water may contain disease-
causing organisms. These organisms can
cause symptoms such as diarrhea, nausea,
cramps, and associated headaches.1e. Subpart Y Coliform N/A TT Coliforms are bacteria that are naturally
Assessment and/or Corrective present in the environment and are used
Action Violations [Dagger]. as an indicator that other, potentially
harmful, waterborne pathogens may be
present or that a potential pathway
exists through which contamination may
enter the drinking water distribution
system. We found coliforms indicating
the need to look for potential problems
in water treatment or distribution. When
this occurs, we are required to conduct
assessments to identify problems and to
correct any problems that are found.
[THE SYSTEM MUST USE THE FOLLOWING
APPLICABLE SENTENCES.]
We failed to conduct the required
assessment.
We failed to correct all identified
sanitary defects that were found during
the assessment(s).1f. Subpart Y E.coli N/A TT E. coli are bacteria whose presence
Assessment and/or Corrective indicates that the water may be
Action Violations [Dagger]. contaminated with human or animal
wastes. Human pathogens in these wastes
can cause short-term effects, such as
diarrhea, cramps, nausea, headaches, or
other symptoms. They may pose a greater
health risk for infants, young children,
the elderly, and people with severely
compromised immune systems. We violated
the standard for E. coli, indicating the
need to look for potential problems in
water treatment or distribution. When
this occurs, we are required to conduct
a detailed assessment to identify
problems and to correct any problems
that are found.
[THE SYSTEM MUST USE THE FOLLOWING
APPLICABLE SENTENCES.]
We failed to conduct the required
assessment.
We failed to correct all identified
sanitary defects that were found during
the assessment that we conducted.
1g. E. coli [Dagger].......... Zero In compliance E. coli are bacteria whose presence
unless one of indicates that the water may be
the following contaminated with human or animal
conditions wastes. Human pathogens in these wastes
occurs: can cause short-term effects, such as
(1) The system diarrhea, cramps, nausea, headaches, or
has an E. coli- other symptoms. They may pose a greater
positive repeat health risk for infants, young children,
sample following the elderly, and people with severely
a total coliform- compromised immune systems.
positive routine
sample.
(2) The system
has a total
coliform-
positive repeat
sample following
an E. coli-
positive routine
sample.
(3) The system
fails to take
all required
repeat samples
following an E.
coli-positive
routine sample.
(4) The system
fails to test
for E. coli when
any repeat
sample tests
positive for
total coliform.1h. Subpart Y Seasonal System N/A TT When this violation includes the failure
TT Violations [Dagger]. to monitor for total coliforms or E.
coli prior to serving water to the
public, the mandatory language found at
141.205(d)(2) must be used.
When this violation includes failure to
complete other actions, the appropriate
elements found in 141.205(a) to describe
the violation must be used.2a. Turbidity (MCL) \4\....... None 1 NTU \5\/5 NTU Turbidity has no health effects. However,
turbidity can interfere with
disinfection and provide a medium for
microbial growth. Turbidity may indicate
the presence of disease-causing
organisms. These organisms include
bacteria, viruses, and parasites that
can cause symptoms such as nausea,
cramps, diarrhea and associated
headaches.2b. Turbidity (SWTR TT) \6\... None TT \7\ Turbidity has no health effects. However,
turbidity can interfere with
disinfection and provide a medium for
microbial growth. Turbidity may indicate
the presence of disease-causing
organisms. These organisms include
bacteria, viruses, and parasites that
can cause symptoms such as nausea,
cramps, diarrhea and associated
headaches.
2c. Turbidity (IESWTR TT and None TT Turbidity has no health effects. However,
LT1ESWTR TT) \8\. turbidity can interfere with
disinfection and provide a medium for
microbial growth. Turbidity may indicate
the presence of disease-causing
organisms. These organisms include
bacteria, viruses, and parasites that
can cause symptoms such as nausea,
cramps, diarrhea and associated
headaches.----------------------------------------------------------------------------------------------------------------
B. Surface Water Treatment Rule (SWTR), Interim Enhanced Surface Water Treatment Rule (IESWTR), Long Term 1
Enhanced Surface Water Treatment Rule (LT1ESWTR) and the Filter Backwash Recycling Rule (FBRR) violations----------------------------------------------------------------------------------------------------------------3. Giardia lamblia (SWTR/ Zero TT \10\ Inadequately treated water may contain
IESWTR/LT1ESWTR). disease-causing organisms. These
organisms include bacteria, viruses, and
parasites which can cause symptoms such
as nausea, cramps, diarrhea, and
associated headaches.4. Viruses (SWTR/IESWTR/
LT1ESWTR).5. Heterotrophic plate count
(HPC) bacteria \9\ (SWTR/
IESWTR/LT1ESWTR).6. Legionella (SWTR/IESWTR/
LT1ESWTR).7. Cryptosporidium (IESWTR/
FBRR/LT1ESWTR).----------------------------------------------------------------------------------------------------------------
C. Inorganic Chemicals (IOCs)----------------------------------------------------------------------------------------------------------------8. Antimony................... 0.006 0.006 Some people who drink water containing
antimony well in excess of the MCL over
many years could experience increases in
blood cholesterol and decreases in blood
sugar.9. Arsenic \11\............... 0 0.010 Some people who drink water containing
arsenic in excess of the MCL over many
years could experience skin damage or
problems with their circulatory system,
and may have an increased risk of
getting cancer.10. Asbestos (10 [micro]m).... 7 MFL \12\ 7 MFL Some people who drink water containing
asbestos in excess of the MCL over many
years may have an increased risk of
developing benign intestinal polyps.11. Barium.................... 2 2 Some people who drink water containing
barium in excess of the MCL over many
years could experience an increase in
their blood pressure.12. Beryllium................. 0.004 0.004 Some people who drink water containing
beryllium well in excess of the MCL over
many years could develop intestinal
lesions.13. Cadmium................... 0.005 0.005 Some people who drink water containing
cadmium in excess of the MCL over many
years could experience kidney damage.14. Chromium (total).......... 0.1 0.1 Some people who use water containing
chromium well in excess of the MCL over
many years could experience allergic
dermatitis.15. Cyanide................... 0.2 0.2 Some people who drink water containing
cyanide well in excess of the MCL over
many years could experience nerve damage
or problems with their thyroid.16. Fluoride.................. 4.0 4.0 Some people who drink water containing
fluoride in excess of the MCL over many
years could get bone disease, including
pain and tenderness of the bones.
Fluoride in drinking water at half the
MCL or more may cause mottling of
children's teeth, usually in children
less than nine years old. Mottling, also
known as dental fluorosis, may include
brown staining and/or pitting of the
teeth, and occurs only in developing
teeth before they erupt from the gums.17. Mercury (inorganic)....... 0.002 0.002 Some people who drink water containing
inorganic mercury well in excess of the
MCL over many years could experience
kidney damage.18. Nitrate................... 10 10 Infants below the age of six months who
drink water containing nitrate in excess
of the MCL could become seriously ill
and, if untreated, may die. Symptoms
include shortness of breath and blue
baby syndrome.19. Nitrite................... 1 1 Infants below the age of six months who
drink water containing nitrite in excess
of the MCL could become seriously ill
and, if untreated, may die. Symptoms
include shortness of breath and blue
baby syndrome.
20. Total Nitrate and Nitrite. 10 10 Infants below the age of six months who
drink water containing nitrate and
nitrite in excess of the MCL could
become seriously ill and, if untreated,
may die. Symptoms include shortness of
breath and blue baby syndrome.21. Selenium.................. 0.05 0.05 Selenium is an essential nutrient.
However, some people who drink water
containing selenium in excess of the MCL
over many years could experience hair or
fingernail losses, numbness in fingers
or toes, or problems with their
circulation.22. Thallium.................. 0.0005 0.002 Some people who drink water containing
thallium in excess of the MCL over many
years could experience hair loss,
changes in their blood, or problems with
their kidneys, intestines, or liver.----------------------------------------------------------------------------------------------------------------
D. Lead and Copper Rule----------------------------------------------------------------------------------------------------------------23. Lead...................... Zero TT \13\ Infants and children who drink water
containing lead in excess of the action
level could experience delays in their
physical or mental development. Children
could show slight deficits in attention
span and learning abilities. Adults who
drink this water over many years could
develop kidney problems or high blood
pressure.24. Copper.................... 1.3 TT \14\ Copper is an essential nutrient, but some
people who drink water containing copper
in excess of the action level over a
relatively short amount of time could
experience gastrointestinal distress.
Some people who drink water containing
copper in excess of the action level
over many years could suffer liver or
kidney damage. People with Wilson's
Disease should consult their personal
doctor.----------------------------------------------------------------------------------------------------------------
E. Synthetic Organic Chemicals (SOCs)----------------------------------------------------------------------------------------------------------------25. 2,4-D..................... 0.07 0.07 Some people who drink water containing
the weed killer 2,4-D well in excess of
the MCL over many years could experience
problems with their kidneys, liver, or
adrenal glands.26. 2,4,5-TP (Silvex)......... 0.05 0.05 Some people who drink water containing
silvex in excess of the MCL over many
years could experience liver problems.27. Alachlor.................. Zero 0.002 Some people who drink water containing
alachlor in excess of the MCL over many
years could have problems with their
eyes, liver, kidneys, or spleen, or
experience anemia, and may have an
increased risk of getting cancer.28. Atrazine.................. 0.003 0.003 Some people who drink water containing
atrazine well in excess of the MCL over
many years could experience problems
with their cardiovascular system or
reproductive difficulties.29. Benzo(a)pyrene (PAHs)..... Zero 0.0002 Some people who drink water containing
benzo(a)pyrene in excess of the MCL over
many years may experience reproductive
difficulties and may have an increased
risk of getting cancer.30. Carbofuran................ 0.04 0.04 Some people who drink water containing
carbofuran in excess of the MCL over
many years could experience problems
with their blood, or nervous or
reproductive systems.31. Chlordane................. Zero 0.002 Some people who drink water containing
chlordane in excess of the MCL over many
years could experience problems with
their liver or nervous system, and may
have an increased risk of getting
cancer.32. Dalapon................... 0.2 0.2 Some people who drink water containing
dalapon well in excess of the MCL over
many years could experience minor kidney
changes.33. Di(2-ethylhexyl) adipate.. 0.4 0.4 Some people who drink water containing
di(2-ethylhexyl) adipate well in excess
of the MCL over many years could
experience toxic effects such as weight
loss, liver enlargement or possible
reproductive difficulties.
34. Di(2-ethylhexyl) phthalate Zero 0.006 Some people who drink water containing
di(2-ethylhexyl) phthalate well in
excess of the MCL over many years may
have problems with their liver, or
experience reproductive difficulties,
and may have an increased risk of
getting cancer.35. Dibromochloropropane Zero 0.0002 Some people who drink water containing
(DBCP). DBCP in excess of the MCL over many
years could experience reproductive
difficulties and may have an increased
risk of getting cancer.36. Dinoseb................... 0.007 0.007 Some people who drink water containing
dinoseb well in excess of the MCL over
many years could experience reproductive
difficulties.37. Dioxin (2,3,7,8-TCDD)..... Zero 3x10 -8 Some people who drink water containing
dioxin in excess of the MCL over many
years could experience reproductive
difficulties and may have an increased
risk of getting cancer.38. Diquat.................... 0.02 0.02 Some people who drink water containing
diquat in excess of the MCL over many
years could get cataracts.39. Endothall................. 0.1 0.1 Some people who drink water containing
endothall in excess of the MCL over many
years could experience problems with
their stomach or intestines.40. Endrin.................... 0.002 0.002 Some people who drink water containing
endrin in excess of the MCL over many
years could experience liver problems.41. Ethylene dibromide........ Zero 0.00005 Some people who drink water containing
ethylene dibromide in excess of the MCL
over many years could experience
problems with their liver, stomach,
reproductive system, or kidneys, and may
have an increased risk of getting
cancer.42. Glyphosate................ 0.7 0.7 Some people who drink water containing
glyphosate in excess of the MCL over
many years could experience problems
with their kidneys or reproductive
difficulties.43. Heptachlor................ Zero 0.0004 Some people who drink water containing
heptachlor in excess of the MCL over
many years could experience liver damage
and may have an increased risk of
getting cancer.44. Heptachlor epoxide........ Zero 0.0002 Some people who drink water containing
heptachlor epoxide in excess of the MCL
over many years could experience liver
damage, and may have an increased risk
of getting cancer.45. Hexachlorobenzene......... Zero 0.001 Some people who drink water containing
hexachlorobenzene in excess of the MCL
over many years could experience
problems with their liver or kidneys, or
adverse reproductive effects, and may
have an increased risk of getting
cancer.46. Hexachlorocyclo-pentadiene 0.05 0.05 Some people who drink water containing
hexachlorocyclopentadiene well in excess
of the MCL over many years could
experience problems with their kidneys
or stomach.47. Lindane................... 0.0002 0.0002 Some people who drink water containing
lindane in excess of the MCL over many
years could experience problems with
their kidneys or liver.48. Methoxychlor.............. 0.04 0.04 Some people who drink water containing
methoxychlor in excess of the MCL over
many years could experience reproductive
difficulties.49. Oxamyl (Vydate)........... 0.2 0.2 Some people who drink water containing
oxamyl in excess of the MCL over many
years could experience slight nervous
system effects.50. Pentachlorophenol......... Zero 0.001 Some people who drink water containing
pentachlorophenol in excess of the MCL
over many years could experience
problems with their liver or kidneys,
and may have an increased risk of
getting cancer.51. Picloram.................. 0.5 0.5 Some people who drink water containing
picloram in excess of the MCL over many
years could experience problems with
their liver.52. Polychlorinated biphenyls Zero 0.0005 Some people who drink water containing
(PCBs). PCBs in excess of the MCL over many
years could experience changes in their
skin, problems with their thymus gland,
immune deficiencies, or reproductive or
nervous system difficulties, and may
have an increased risk of getting
cancer.53. Simazine.................. 0.004 0.004 Some people who drink water containing
simazine in excess of the MCL over many
years could experience problems with
their blood.54. Toxaphene................. Zero 0.003 Some people who drink water containing
toxaphene in excess of the MCL over many
years could have problems with their
kidneys, liver, or thyroid, and may have
an increased risk of getting cancer.----------------------------------------------------------------------------------------------------------------
F. Volatile Organic Chemicals (VOCs)----------------------------------------------------------------------------------------------------------------55. Benzene................... Zero 0.005 Some people who drink water containing
benzene in excess of the MCL over many
years could experience anemia or a
decrease in blood platelets, and may
have an increased risk of getting
cancer.56. Carbon tetrachloride...... Zero 0.005 Some people who drink water containing
carbon tetrachloride in excess of the
MCL over many years could experience
problems with their liver and may have
an increased risk of getting cancer.57. Chlorobenzene (monochloro- 0.1 0.1 Some people who drink water containing
benzene). chlorobenzene in excess of the MCL over
many years could experience problems
with their liver or kidneys.58. o-Dichlorobenzene......... 0.6 0.6 Some people who drink water containing o-
dichlorobenzene well in excess of the
MCL over many years could experience
problems with their liver, kidneys, or
circulatory systems.59. p-Dichlorobenzene......... 0.075 0.075 Some people who drink water containing p-
dichlorobenzene in excess of the MCL
over many years could experience anemia,
damage to their liver, kidneys, or
spleen, or changes in their blood.60. 1,2-Dichloroethane........ Zero 0.005 Some people who drink water containing
1,2-dichloroethane in excess of the MCL
over many years may have an increased
risk of getting cancer.61. 1,1-Dichloroethylene...... 0.007 0.007 Some people who drink water containing
1,1-dichloroethylene in excess of the
MCL over many years could experience
problems with their liver.62. cis-1,2-Dichloroethylene.. 0.07 0.07 Some people who drink water containing
cis-1,2-dichloroethylene in excess of
the MCL over many years could experience
problems with their liver.63. trans-1,2-Dichloroethylene 0.1 0.1 Some people who drink water containing
trans-1,2-dichloroethylene well in
excess of the MCL over many years could
experience problems with their liver.64. Dichloromethane........... Zero 0.005 Some people who drink water containing
dichloromethane in excess of the MCL
over many years could have liver
problems and may have an increased risk
of getting cancer.65. 1,2-Dichloropropane....... Zero 0.005 Some people who drink water containing
1,2-dichloropropane in excess of the MCL
over many years may have an increased
risk of getting cancer.66. Ethylbenzene.............. 0.7 0.7 Some people who drink water containing
ethylbenzene well in excess of the MCL
over many years could experience
problems with their liver or kidneys.67. Styrene................... 0.1 0.1 Some people who drink water containing
styrene well in excess of the MCL over
many years could have problems with
their liver, kidneys, or circulatory
system.68. Tetrachloroethylene....... Zero 0.005 Some people who drink water containing
tetrachloroethylene in excess of the MCL
over many years could have problems with
their liver, and may have an increased
risk of getting cancer.69. Toluene................... 1 1 Some people who drink water containing
toluene well in excess of the MCL over
many years could have problems with
their nervous system, kidneys, or liver.70. 1,2,4-Trichlorobenzene.... 0.07 0.07 Some people who drink water containing
1,2,4-trichlorobenzene well in excess of
the MCL over many years could experience
changes in their adrenal glands.71. 1,1,1-Trichloroethane..... 0.2 0.2 Some people who drink water containing
1,1,1-trichloroethane in excess of the
MCL over many years could experience
problems with their liver, nervous
system, or circulatory system.72. 1,1,2-Trichloroethane..... 0.003 0.005 Some people who drink water containing
1,1,2-trichloroethane well in excess of
the MCL over many years could have
problems with their liver, kidneys, or
immune systems.73. Trichloroethylene......... Zero 0.005 Some people who drink water containing
trichloroethylene in excess of the MCL
over many years could experience
problems with their liver and may have
an increased risk of getting cancer.74. Vinyl chloride............ Zero 0.002 Some people who drink water containing
vinyl chloride in excess of the MCL over
many years may have an increased risk of
getting cancer.
75. Xylenes (total)........... 10 10 Some people who drink water containing
xylenes in excess of the MCL over many
years could experience damage to their
nervous system.----------------------------------------------------------------------------------------------------------------
G. Radioactive Contaminants----------------------------------------------------------------------------------------------------------------76. Beta/photon emitters...... Zero 4 mrem/yr \15\ Certain minerals are radioactive and may
emit forms of radiation known as photons
and beta radiation. Some people who
drink water containing beta and photon
emitters in excess of the MCL over many
years may have an increased risk of
getting cancer.77. Alpha emitters............ Zero 17 pCi/L \17\ Certain minerals are radioactive and may
emit a form of radiation known as alpha
radiation. Some people who drink water
containing alpha emitters in excess of
the MCL over many years may have an
increased risk of getting cancer.78. Combined radium (226 & Zero 5 pCi/L Some people who drink water containing
228). radium 226 or 228 in excess of the MCL
over many years may have an increased
risk of getting cancer.79. Uranium \16\.............. Zero 30 [micro]g/L Some people who drink water containing
uranium in excess of the MCL over many
years may have an increased risk of
getting cancer and kidney toxicity.----------------------------------------------------------------------------------------------------------------
H. Disinfection Byproducts (DBPs), Byproduct Precursors, and Disinfectant Residuals: Where disinfection is used
in the treatment of drinking water, disinfectants combine with organic and inorganic matter present in water to
form chemicals called disinfection byproducts (DBPs). EPA sets standards for controlling the levels of
disinfectants and DBPs in drinking water, including trihalomethanes (THMs) and haloacetic acids (HAAs) \18\----------------------------------------------------------------------------------------------------------------80. Total trihalomethanes N/A 0.080 \19 20\ Some people who drink water containing
(TTHMs). trihalomethanes in excess of the MCL
over many years may experience problems
with their liver, kidneys, or central
nervous system, and may have an
increased risk of getting cancer.81. Haloacetic Acids (HAA).... N/A 0.060 \21\ Some people who drink water containing
haloacetic acids in excess of the MCL
over many years may have an increased
risk of getting cancer.82. Bromate................... Zero 0.010 Some people who drink water containing
bromate in excess of the MCL over many
years may have an increased risk of
getting cancer.83. Chlorite.................. 0.08 1.0 Some infants and young children who drink
water containing chlorite in excess of
the MCL could experience nervous system
effects. Similar effects may occur in
fetuses of pregnant women who drink
water containing chlorite in excess of
the MCL. Some people may experience
anemia.84. Chlorine.................. 4 (MRDLG) \22\ 4.0 (MRDL) \23\ Some people who use water containing
chlorine well in excess of the MRDL
could experience irritating effects to
their eyes and nose. Some people who
drink water containing chlorine well in
excess of the MRDL could experience
stomach discomfort.85. Chloramines............... 4 (MRDLG) 4.0 (MRDL) Some people who use water containing
chloramines well in excess of the MRDL
could experience irritating effects to
their eyes and nose. Some people who
drink water containing chloramines well
in excess of the MRDL could experience
stomach discomfort or anemia.86a. Chlorine dioxide, where 0.8 (MRDLG) 0.8 (MRDL) Some infants and young children who drink
any 2 consecutive daily water containing chlorine dioxide in
samples taken at the entrance excess of the MRDL could experience
to the distribution system nervous system effects. Similar effects
are above the MRDL. may occur in fetuses of pregnant women
who drink water containing chlorine
dioxide in excess of the MRDL. Some
people may experience anemia.
Add for public notification only: The
chlorine dioxide violations reported
today are the result of exceedances at
the treatment facility only, not within
the distribution system which delivers
water to consumers. Continued compliance
with chlorine dioxide levels within the
distribution system minimizes the
potential risk of these violations to
consumers.86b. Chlorine dioxide, where 0.8 (MRDLG) 0.8 (MRDL) Some infants and young children who drink
one or more distribution water containing chlorine dioxide in
system samples are above the excess of the MRDL could experience
MRDL. nervous system effects. Similar effects
may occur in fetuses of pregnant women
who drink water containing chlorine
dioxide in excess of the MRDL. Some
people may experience anemia.
Add for public notification only: The
chlorine dioxide violations reported
today include exceedances of the EPA
standard within the distribution system
which delivers water to consumers.
Violations of the chlorine dioxide
standard within the distribution system
may harm human health based on short-
term exposures. Certain groups,
including fetuses, infants, and young
children, may be especially susceptible
to nervous system effects from excessive
chlorine dioxide exposure.87. Control of DBP precursors None TT Total organic carbon (TOC) has no health
(TOC). effects. However, total organic carbon
provides a medium for the formation of
disinfection byproducts. These
byproducts include trihalomethanes
(THMs) and haloacetic acids (HAAs).
Drinking water containing these
byproducts in excess of the MCL may lead
to adverse health effects, liver or
kidney problems, or nervous system
effects, and may lead to an increased
risk of getting cancer.----------------------------------------------------------------------------------------------------------------
I. Other Treatment Techniques----------------------------------------------------------------------------------------------------------------88. Acrylamide................ Zero TT Some people who drink water containing
high levels of acrylamide over a long
period of time could have problems with
their nervous system or blood, and may
have an increased risk of getting
cancer.89. Epichlorohydrin........... Zero TT Some people who drink water containing
high levels of epichlorohydrin over a
long period of time could experience
stomach problems, and may have an
increased risk of getting cancer.----------------------------------------------------------------------------------------------------------------
Appendix B--Endnotes
[dagger] Until March 31, 2016.
[Dagger] Beginning April 1, 2016.
1. MCLG--Maximum contaminant level goal
2. MCL--Maximum contaminant level
3. For water systems analyzing at least 40 samples per month, no more than 5.0 percent of the monthly samples may be positive for total coliforms. For systems analyzing fewer than 40 samples per month, no more than one sample per month may be positive for total coliforms.
4. There are various regulations that set turbidity standards for different types of systems, including 40 CFR 141.13, and the 1989 Surface Water Treatment Rule, the 1998 Interim Enhanced Surface Water Treatment Rule and the 2002 Long Term 1 Enhanced Surface Water Treatment Rule. The MCL for the monthly turbidity average is 1 NTU; the MCL for the 2-day average is 5 NTU for systems that are required to filter but have not yet installed filtration (40 CFR 141.13).
5. NTU--Nephelometric turbidity unit
6. There are various regulations that set turbidity standards for different types of systems, including 40 CFR 141.13, and the 1989 Surface Water Treatment Rule, the 1998 Interim Enhanced Surface Water Treatment Rule and the 2001 Long Term 1 Enhanced Surface Water Treatment Rule. Systems subject to the Surface Water Treatment Rule (both filtered and unfiltered) may not exceed 5 NTU. In addition, in filtered systems, 95 percent of samples each month must not exceed 0.5 NTU in systems using conventional or direct filtration and must not exceed 1 NTU in systems using slow sand or diatomaceous earth filtration or other filtration technologies approved by the primacy agency.
7. TT--Treatment technique
8. There are various regulations that set turbidity standards for different types of systems, including 40 CFR 141.13, the 1989 Surface Water Treatment Rule (SWTR), the 1998 Interim Enhanced Surface Water Treatment Rule (IESWTR) and the 2002 Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR). For systems subject to the IESWTR (systems serving at least 10,000 people, using surface water or ground water under the direct influence of surface water), that use conventional filtration or direct filtration, after January 1, 2002, the turbidity level of a system's combined filter effluent may not exceed 0.3 NTU in at least 95 percent of monthly measurements, and the turbidity level of a system's combined filter effluent must not exceed 1 NTU at any time. Systems subject to the IESWTR using technologies other than conventional, direct, slow sand, or diatomaceous earth filtration must meet turbidity limits set by the primacy agency. For systems subject to the LT1ESWTR (systems serving fewer than 10,000 people, using surface water or ground water under the direct influence of surface water) that use conventional filtration or direct filtration, after January 1, 2005, the turbidity level of a system's combined filter effluent may not exceed 0.3 NTU in at least 95 percent of monthly measurements, and the turbidity level of a system's combined filter effluent must not exceed 1 NTU at any time. Systems subject to the LT1ESWTR using technologies other than conventional, direct, slow sand, or diatomaceous earth filtration must meet turbidity limits set by the primacy agency.
9. The bacteria detected by heterotrophic plate count (HPC) are not necessarily harmful. HPC is simply an alternative method of determining disinfectant residual levels. The number of such bacteria is an indicator of whether there is enough disinfectant in the distribution system.
10. SWTR, IESWTR, and LT1ESWTR treatment technique violations that involve turbidity exceedances may use the health effects language for turbidity instead.
11. These arsenic values are effective January 23, 2006. Until then, the MCL is 0.05 mg/L and there is no MCLG.
12. Millions fibers per liter.
13. Action Level = 0.015 mg/L
14. Action Level = 1.3 mg/L
15. Millirems per years
16. The uranium MCL is effective December 8, 2003 for all community water systems.
17. Picocuries per liter
18. Surface water systems and ground water systems under the direct influence of surface water are regulated under subpart H of 40 CFR 141. Subpart H community and non-transient non-community systems serving =10,000 must comply with subpart L DBP MCLs and disinfectant maximum residual disinfectant levels (MRDLs) beginning January 1, 2002. All other community and non-transient non-community systems must comply with subpart L DBP MCLs and disinfectant MRDLs beginning January 1, 2004. Subpart H transient non-community systems serving =10,000 that use chlorine dioxide as a disinfectant or oxidant must comply with the chlorine dioxide MRDL beginning January 1, 2002. All other transient non-community systems that use chlorine dioxide as a disinfectant or oxidant must comply with the chlorine dioxide MRDL beginning January 1, 2004.
19. Community and non-transient non-community systems must comply with subpart V TTHM and HAA5 MCLs of 0.080 mg/L and 0.060 mg/L, respectively (with compliance calculated as a locational running annual average) on the schedule in Sec. 141.620.
20. The MCL for total trihalomethanes is the sum of the concentrations of the individual trihalomethanes.
21. The MCL for haloacetic acids is the sum of the concentrations of the individual haloacetic acids.
22. MRDLG--Maximum residual disinfectant level goal.
23. MRDL--Maximum residual disinfectant level. [65 FR 26043, May 4, 2000; 65 FR 38629, June 21, 2000; 65 FR 40521, 40522, June 30, 2000, as amended at 65 FR 76751, Dec. 7, 2000; 66 FR 7065, Jan. 22, 2001; 66 FR 31104, June 8, 2001; 67 FR 1838, Jan. 14, 2002; 67 FR 70857, Nov. 27, 2002; 68 FR 14507, Mar. 25, 2003; 69 FR 38856, June 29, 2004; 71 FR 483, Jan. 4, 2006; 71 FR 65653, Nov. 8, 2006; 78 FR 10351, Feb. 13, 2013]
Sec. Appendix C to Subpart Q of Part 141--List of Acronyms Used in
Public Notification Regulation CCR Consumer Confidence ReportCWS Community Water SystemDBP Disinfection ByproductEPA Environmental Protection AgencyGWR Ground Water RuleHPC Heterotrophic Plate CountIESWTR Interim Enhanced Surface Water Treatment RuleIOC Inorganic ChemicalLCR Lead and Copper RuleMCL Maximum Contaminant LevelMCLG Maximum Contaminant Level GoalMRDL Maximum Residual Disinfectant LevelMRDLG Maximum Residual Disinfectant Level GoalNCWS Non-Community Water SystemNPDWR National Primary Drinking Water RegulationNTNCWS Non-Transient Non-Community Water SystemNTU Nephelometric Turbidity UnitOGWDW Office of Ground Water and Drinking WaterOW Office of WaterPN Public NotificationPWS Public Water SystemSDWA Safe Drinking Water ActSMCL Secondary Maximum Contaminant LevelSOC Synthetic Organic ChemicalSWTR Surface Water Treatment RuleTCR Total Coliform RuleTT Treatment TechniqueTWS Transient Non-Community Water SystemVOC Volatile Organic Chemical [65 FR 26035, May 4, 2000, as amended at 71 FR 65653, Nov. 8, 2006] Subpart R [Reserved]