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40 CFR § 444.16 - Pretreatment standards for existing sources (PSES).

---
identifier: "/us/cfr/t40/s444.16"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 444.16 - Pretreatment standards for existing sources (PSES)."
title_number: 40
title_name: "Protection of Environment"
section_number: "444.16"
section_name: "Pretreatment standards for existing sources (PSES)."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "444"
part_name: "WASTE COMBUSTORS 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, 306, 307, 308, 402, and 501 of the Clean Water Act, as amended; 33 U.S.C. 1311, 1314, 1316, 1317, 1318, 1342, and 1361."
regulatory_source: "65 FR 4381, Jan. 27, 2000, unless otherwise noted."
cfr_part: "444"
---

# 444.16 Pretreatment standards for existing sources (PSES).

Except as provided in 40 CFR 403.7 and 403.13, any source that introduces wastewater pollutants into a POTW must comply with part 403 and achieve the following pretreatment standards:

Pretreatment Standards

| Regulatedparameter | Maximum daily | Maximum monthly avg. |
| --- | --- | --- |
| Arsenic | 84 | 72 |
| Cadmium | 71 | 26 |
| Chromium | 25 | 14 |
| Copper | 23 | 14 |
| Lead | 57 | 32 |
| Mercury | 2.3 | 1.3 |
| Silver | 13 | 8 |
| Titanium | 60 | 22 |
| Zinc | 82 | 54 |
| Micrograms per liter (ppb) |  |  |