StacksVerified U.S. regulatory reference

40 CFR §420.45

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 which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources.
  1. (a)Electric arc furnace steelmaking—semi-wet. No discharge of process wastewater pollutants to navigable waters.
  2. (b)Basic oxygen furnace steelmaking—wet-suppressed combustion.
  3. (c)Basic oxygen furnace steelmaking—wet open combustion; and electric arc furnace steelmaking—wet.
  4. (d)Basic oxygen furnace steelmaking—semi-wet.
    1. (1)No discharge of process wastewater pollutants to navigable waters.
    2. (2)If the permittee demonstrates to the satisfaction of the pretreatment control authority that safety considerations prevent attainment of these limitations, the pretreatment control authority may establish alternative limitations on a best professional judgment basis.