StacksVerified U.S. regulatory reference

40 CFR §420.135

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart that introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and must achieve the following pretreatment standards for existing sources (PSES):
  1. (a)Direct-reduced iron. [Reserved]
  2. (b)Forging operations. [Reserved]
  3. (c)Briquetting. There shall be no discharge of process wastewater pollutants to POTWs.