CFR /  Title 40  /  Part 60  /  Sec. 60.1420 If a semiannual report is required, when must I

(a) For data collected during the first half of a calendar year, submit your semiannual report by August 1 of that year.

(b) For data you collected during the second half of the calendar year, submit your semiannual report by February 1 of the following year.