Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart that introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403, and achieve the following pretreatment standards:
| Pollutant or pollutant property | PSES | |
|---|---|---|
| Maximum for any 1 day | Maximum for monthly average | |
| Milligrams per liter (mg/l) | ||
| Total chromium | 19 | 12 |
| pH | (1) | (1) |