StacksVerified U.S. regulatory reference

40 CFR §421.316

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Except as provided in 40 CFR 403.7, any new 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 new sources. The mass of wastewater pollutants in secondary tungsten and cobalt process wastewater introduced into a POTW shall not exceed the following values:
  1. (a)Tungsten detergent wash and rinse.
  2. (b)Tungsten leaching acid.
  3. (c)Tungsten post-leaching wash and rinse.
  4. (d)Synthetic scheelite filtrate.
  5. (e)Tungsten carbide leaching wet air pollution control.
  6. (f)Tungsten carbide wash water.
  7. (g)Cobalt sludge leaching wet air pollution control.
  8. (h)Crystallization decant.
  9. (i)Acid wash decant.
  10. (j)Cobalt hydroxide filtrate.
  11. (k)Cobalt hydroxide filter cake wash.