40 CFR § 437.35
Pretreatment standards for existing sources (PSES)
June 9, 2020
Except as provided in 40 CFR 403.7, 403.13 or §437.30(b), and no later than December 22, 2003, any existing source subject to this subpart must achieve the following pretreatment standards: Standards for o-cresol, p-cresol, 2,4,6-trichlorophenol are the same as the corresponding limitation specified in §437.31.
[65 FR 81300, Dec. 22, 2000, as amended at 68 FR 71023, Dec. 22, 2003]