40 CFR § 141.562 - My system only has two or fewer filters—is there any special provision regarding individual filter turbidity monitoring?

---
identifier: "/us/cfr/t40/s141.562"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 141.562 - My system only has two or fewer filters—is there any special provision regarding individual filter turbidity monitoring?"
title_number: 40
title_name: "Protection of Environment"
section_number: "141.562"
section_name: "My system only has two or fewer filters—is there any special provision regarding individual filter turbidity monitoring?"
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"
---


# 141.562 My system only has two or fewer filters—is there any special provision regarding individual filter turbidity monitoring?

Yes, if your system only consists of two or fewer filters, you may conduct continuous monitoring of combined filter effluent turbidity in lieu of individual filter effluent turbidity monitoring. Continuous monitoring must meet the same requirements set forth in § 141.560(a) through (d) and § 141.561.