40 CFR § 425.74 - New source performance standards (NSPS).

---
identifier: "/us/cfr/t40/s425.74"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 425.74 - New source performance standards (NSPS)."
title_number: 40
title_name: "Protection of Environment"
section_number: "425.74"
section_name: "New source performance standards (NSPS)."
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"
---


# 425.74 New source performance standards (NSPS).

Any new source subject to this subpart must achieve the following new source performance standards (NSPS):

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (or pound per 1,000 lb) of raw material |  |
| BOD | 13.2 | 5.9 |
| TSS | 19.1 | 8.7 |
| Oil and grease | 5.6 | 2.5 |
| Total chromium | 0.34 | 0.12 |
| pH | () | () |
| Within the range 6.0 to 9.0. |  |  |