40 CFR § 141.553 - My system practices lime softening—is there any special provision regarding my combined filter effluent?

---
identifier: "/us/cfr/t40/s141.553"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 141.553 - My system practices lime softening—is there any special provision regarding my combined filter effluent?"
title_number: 40
title_name: "Protection of Environment"
section_number: "141.553"
section_name: "My system practices lime softening—is there any special provision regarding my combined filter effluent?"
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"
---


# 141.553 My system practices lime softening—is there any special provision regarding my combined filter effluent?

If your system practices lime softening, you may acidify representative combined filter effluent turbidity samples prior to analysis using a protocol approved by the State.