StacksVerified U.S. regulatory reference

40 CFR §421.254

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Any new source subject to this subpart shall achieve the following new source performance standards:
  1. (a)Smelter wet air pollution control.
  2. (b)Silver chloride reduction spent solution.
  3. (c)Electrolytic cells wet air pollution control.
  4. (d)Electrolyte preparation wet air pollution control.
  5. (e)Calciner wet air pollution control.
  6. (f)Calcine quench water.
  7. (g)Calciner stack gas contract cooling water.
  8. (h)Condenser blowdown.
  9. (i)Mercury cleaning bath water.