CFR / 
Title 40
 / Part 421
 / 
Sec. 421.4 Compliance date for pretreatment standards for existing
The PSES compliance deadline in subparts A through M is March 8, 1987. The PSES compliance deadline for plants in subparts N through AE is September 20, 1988.
[50 FR 52776, Dec. 26, 1985]