U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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 (PSNS):
Subpart AP—Hydrogen Cyanide
Pollutant or pollutant property | PSNS effluent limitations | |
---|---|---|
Maximum for any 1 day | Average of daily values for 30 consecutive days | |
Milligrams per liter | ||
Cyanide A | 1.7 | 0.36 |
Total Cyanide | 11 | 4.0 |