40 CFR § 429.95
Pretreatment standards for existing sources (PSES)
June 9, 2020
Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and meet the following pretreatment standards for existing sources (PSES):
Subpart H
[PSES Effluent Limitations]
Open Table
| Pollutant or pollutant property | Maximum for any 1 day (mg/l) |
|---|---|
| Oil and grease | 100 |
| Copper | 5 |
| Chromium | 4 |
| Arsenic | 4 |
In cases where POTWs find it necessary to impose mass limitations, the following equivalent mass limitations are provided as guidance.
Subpart H
[PSES Effluent Limitations; grams per cu m of production]
Open Table
| Pollutant or pollutant property | Maximum for any 1 day |
|---|---|
| Oil and grease | 20.5 |
| Copper | .62 |
| Chromium | .41 |
| Arsenic | .41 |
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