40 CFR § 141.52 - Maximum contaminant level goals for microbiological contaminants.

---
identifier: "/us/cfr/t40/s141.52"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 141.52 - Maximum contaminant level goals for microbiological contaminants."
title_number: 40
title_name: "Protection of Environment"
section_number: "141.52"
section_name: "Maximum contaminant level goals for microbiological contaminants."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "D"
subchapter_name: "WATER PROGRAMS"
part_number: "141"
part_name: "NATIONAL PRIMARY DRINKING WATER REGULATIONS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 300f, 300g-1, 300g-2, 300g-3, 300g-4, 300g-5, 300g-6, 300j-4, 300j-9, and 300j-11."
regulatory_source: "40 FR 59570, Dec. 24, 1975, unless otherwise noted."
cfr_part: "141"
---


# 141.52 Maximum contaminant level goals for microbiological contaminants.

(a) MCLGs for the following contaminants are as indicated:

| Contaminant | MCLG |
| --- | --- |
| (1) | zero |
| (2) Viruses | zero |
| (3) | zero |
| (4) Total coliforms (including fecal) | zero |
| coliforms and |  |
| (5) | zero |
| (6) | zero |

(b) The MCLG identified in paragraph (a)(4) of this section is applicable until March 31, 2016. The MCLG identified in paragraph (a)(6) of this section is applicable beginning April 1, 2016.

[78 FR 10347, Feb. 13, 2013]