40 CFR § 425.15
Pretreatment standards for existing sources (PSES)
June 9, 2020
(a) Except as provided in §425.04 and 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 achieve the following pretreatment standards:
Open Table
| Pollutant or pollutant property | PSES | |
|---|---|---|
| Maximum for any 1 day | Maximum for monthly average | |
| Milligrams per liter (mg/l) | ||
| Sulfide | 24 | |
| Total chromium | 12 | 8 |
| pH | (1) | (1) |
1Not less than 7.0.
(b) Any existing source subject to this subpart which processes less than 275 hides/day shall comply with §425.15(a), except that the total chromium limitations contained in §425.15(a) do not apply.
[47 FR 52870, Nov. 23, 1982; 48 FR 30116, June 30, 1983, as amended at 53 FR 9182, Mar. 21, 1988; 61 FR 35685, July 8, 1996]
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