StacksVerified U.S. regulatory reference

40 CFR §421.292

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:
  1. (a)Tin smelter SO2 scrubber.
  2. (b)Dealuminizing rinse.
  3. (c)Tin mud acid neutralization filtrate.
  4. (d)Tin hydroxide wash.
  5. (e)Spent electrowinning solution from new scrap.
  6. (f)Spent electrowinning solution from municipal solid waste.
  7. (g)Tin hydroxide supernatant from scrap.
  8. (h)Tin hydroxide supernatant from plating solutions and sludges.
  9. (i)Tin hydroxide filtrate.