40 CFR § 425.95 - Pretreatment standards for existing sources (PSES).

---
identifier: "/us/cfr/t40/s425.95"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 425.95 - Pretreatment standards for existing sources (PSES)."
title_number: 40
title_name: "Protection of Environment"
section_number: "425.95"
section_name: "Pretreatment standards for existing sources (PSES)."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "425"
part_name: "LEATHER TANNING AND FINISHING POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1311, 1314 (b), (c), (e) and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361."
regulatory_source: "47 FR 52870, Nov. 23, 1982, unless otherwise noted."
cfr_part: "425"
---


# 425.95 Pretreatment standards for existing sources (PSES).

(a) 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 must achieve the following pretreatment standards:

|  |  |  |
| --- | --- | --- |
|  | Milligrams per liter (mg/l) |  |
| Total Chromium | 19 | 12 |
| pH | () | () |
| Within the range 6.0 to 10.0. |  |  |

(b) Any existing source subject to this subpart which processes less than 3,600 splits/day shall comply with § 425.95(a), except that the total chromium limitations contained in § 425.95(a) do not apply.

[47 FR 52870, Nov. 23, 1982; 48 FR 30117, June 30, 1983, as amended at 53 FR 9183, Mar. 21, 1988]