U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 04, 2022

§ 425.85 - Pretreatment standards for existing sources (PSES).

Except as provided in § 425.04 and 40 CFR 403.7 and § 403.13, any existing source subject to this subpart that introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403, and achieve the following pretreatment standards:

Pollutant or pollutant property PSES
Maximum for any 1 day Maximum for monthly average
Milligrams per liter (mg/l)
Sulfide24
Total chromium128
pH( 1)( 1)

1 Not less than 7.0.

[47 FR 52870, Nov. 23, 1982, as amended at 61 FR 35685, July 8, 1996]