# Clean Water Act Methods Update Rule for the Analysis of Effluent
> **Rule** · Final rule. · Published 2017-08-28 · Effective 2017-09-27 · 82 FR 40836
## Document
- **Document number:** 2017-17271
- **Category:** water-quality
- **Federal Register citation:** 82 FR 40836
- **CFR reference:** 40 CFR 136
- **Publication date:** 2017-08-28
- **Effective date:** 2017-09-27
- **EPA docket:** EPA-HQ-OW-2014-0797
## Abstract

This rule modifies the testing procedures approved for analysis and sampling under the Clean Water Act. The changes adopted in this final rule fall into the following categories: New and revised EPA methods (including new and/or revised methods published by voluntary consensus standard bodies (VCSB), such as ASTM International and the Standard Methods Committee); updated versions of currently approved methods; methods reviewed under the alternate test procedures (ATP) program; clarifications to the procedures for EPA approval of nationwide and limited use ATPs; and amendments to the procedure for determination of the method detection limit to address laboratory contamination and to better account for intra-laboratory variability.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/08/28/2017-17271/clean-water-act-methods-update-rule-for-the-analysis-of-effluent)
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