33 CFR § 159.123 - Coliform test: Type I devices.

---
identifier: "/us/cfr/t33/s159.123"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 159.123 - Coliform test: Type I devices."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "159.123"
section_name: "Coliform test: Type I devices."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "O"
subchapter_name: "POLLUTION"
part_number: "159"
part_name: "MARINE SANITATION DEVICES"
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. 1322(b)(1); 49 CFR 1.45(b). Subpart E also issued under authority of sec. 1(a)(4), Pub. L. 106-554, 114 Stat. 2763; DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGD 73-83, 40 FR 4624, Jan. 30, 1975, unless otherwise noted."
cfr_part: "159"
---


# 159.123 Coliform test: Type I devices.

(a) The arithmetic mean of the fecal coliform bacteria in 38 of 40 samples of effluent discharged from a Type I device during the test described in § 159.121 must be less than 1000 per 100 milliliters when tested in accordance with 40 CFR part 136.

(b) The 40 samples must be taken from the device as follows: During each of the 10-test days, one sample must be taken at the beginning, middle, and end of an 8-consecutive hour period with one additional sample taken immediately following the peak capacity processing period.

[CGD 73-83, 40 FR 4624, Jan. 30, 1975, as amended by CGD 75-213, 41 FR 15326, Apr. 12, 1976]