StacksVerified U.S. regulatory reference

40 CFR §421.265

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. The mass of wastewater pollutants in secondary precious metals process wastewater introduced into a POTW must not exceed the following values:
  1. (a)Furnace wet air pollution control.
  2. (b)Raw material granulation.
  3. (c)Spent plating solutions.
  4. (d)Spent Cyanide stripping solutions.
  5. (e)Refinery wet air pollution control. 1
  6. (f)Gold solvent extraction raffinate and wash water.
  7. (g)Gold spent electrolyte.
  8. (h)Gold precipitation and filtration.
  9. (i)Platinum precipitation and filtration.
  10. (j)Palladium precipitation and filtration.
  11. (k)Other platinum group metals precipitation and filtration.
  12. (l)Spent solution from PGC salt production.
  13. (m)Equipment and floor wash.
  14. (n)Preliminary Treatment.