40 CFR § 421.206 - Pretreatment standards for new sources.

---
identifier: "/us/cfr/t40/s421.206"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 421.206 - Pretreatment standards for new sources."
title_number: 40
title_name: "Protection of Environment"
section_number: "421.206"
section_name: "Pretreatment standards for new sources."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "421"
part_name: "NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4."
regulatory_source: "49 FR 8790, Mar. 8, 1984, unless otherwise noted."
cfr_part: "421"
---


# 421.206 Pretreatment standards for new sources.

Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in secondary mercury process wastewater introduced into a POTW shall not exceed the following values:

(a) Spent battery electrolyte.

PSNS for the Secondary Mercury Subcategory

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kg (pounds per million pounds) of mercury produced from batteries |  |
| Lead | 0.030 | 0.014 |
| Mercury | 0.016 | 0.006 |

(b) Acid wash and rinse water.

PSNS for the Secondary Mercury Subcategory

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kg (pounds per million pounds) of mercury washed and rinsed |  |
| Lead | 0.00056 | 0.00026 |
| Mercury | 0.00030 | 0.00012 |

(c) Furnance wet air pollution control.

PSNS for the Secondary Mercury Subcategory

| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
|  | mg/kg (pounds per million pounds of mercury processed through furnace |  |
| Lead | 0.000 | 0.000 |
| Mercury | 0.000 | 0.000 |