§ 444.16 Pretreatment standards for existing sources (PSES).
Except as provided in 40 CFR 403.7 and 403.13, any source that introduces wastewater pollutants into a POTW must comply with part 403 and achieve the following pretreatment standards:
| Regulated parameter | Maximum daily | Maximum monthly avg. |
|---|---|---|
| Arsenic | 84 | 72 |
| Cadmium | 71 | 26 |
| Chromium | 25 | 14 |
| Copper | 23 | 14 |
| Lead | 57 | 32 |
| Mercury | 2.3 | 1.3 |
| Silver | 13 | 8 |
| Titanium | 60 | 22 |
| Zinc | 82 | 54 |
| 1 Micrograms per liter (ppb) |