40 CFR 425.05 - Compliance dates.
The compliance date for new source performance standards (NSPS) and pretreatment standards for new sources (PSES) is the date the new source commences discharge. The compliance date for BPT effluent limitations and guidelines and pretreatment standards for existing sources to no later than March 31, 1989.
Title 40 published on 2015-08-22.
No entries appear in the Federal Register after this date, for 40 CFR Part 425.