40 CFR 425.45 - Pretreatment standards for existing sources (PSES).

Regulations last checked for updates: Dec 17, 2025

Title 40 - Protection of Environment last revised: Nov 17, 2028

View all text of Subpart D [§ 425.40 - § 425.46]

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

Except as provided in 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)
Total Chromium	19	12
pH	( ¹)	( ¹)

¹ Within the range 6.0 to 10.0.

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 425.45