View all text of Subpart C [§ 425.30 - § 425.36]
§ 425.35 - Pretreatment standards for existing sources (PSES).
(a) Except as provided in § 425.04 and 40 CFR 403.7 and § 403.13, any existing sources 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 limitations | Maximum for any 1 day | Maximum for monthly average | Milligrams per liter (mg/l) | Sulfide | 24 | — | Total Chromium | 12 | 8 | pH | ( 1) | ( 1) |
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1 Not less than 7.0.
(b) Any existing source subject to this subpart which processes less than 350 hides/day shall comply with § 425.35(a), except that the Total Chromium limitations contained in § 425.35(a) do not apply.