40 CFR 425.85 - Pretreatment standards for existing sources (PSES).

Regulations last checked for updates: Dec 18, 2025

Title 40 - Protection of Environment last revised: Dec 11, 2025

View all text of Subpart H [§ 425.80 - § 425.86]

§ 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
Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average
	Milligrams per liter (mg/l)
Sulfide	24
Total chromium	12	8
pH	( ¹)	( ¹)

¹ Not less than 7.0.

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

authority: 33 U.S.C. 1311,1314,c,e, 1316 (b) andc, 1317 (b) andc,1318

source: 47 FR 52870, Nov. 23, 1982, unless otherwise noted.

cite as: 40 CFR 425.85