EPA’s proposed updates on analysis of effluent
Periodically, the EPA updates the guidelines for establishing test procedures for the analysis of pollutants under 40 CFR Part 136. The latest set of proposed updates were published to the federal register on February 21, 2023. These guidelines apply to the required testing methods used by industries and municipalities that must comply with EPA’s National Pollutant Discharge Elimination System (NPDES) permit program. These procedures for analysis are a central element of the NPDES permit program.
The first set of updates apply to currently used methods under 40 CFR part 136. The second set of proposed updates apply to new or revised approaches that are similar to previously approved methods. For example, revisions include standardizing language between the related methods, updating to reflect current lab practices and clarifying edits. The third category of updates apply to methods the agency have preliminarily concluded are appropriate for nationwide use, after they have been reviewed under the national Alternate Test Procedure (ATP) program. Additionally, the EPA is proposing amendments to the text and tables in the regulation aimed at improving data quality.
In order to ensure compliance with the technology and water quality-based requirements of the Clean Water Act NPDES permits include restrictions on the quality of designated pollutants that can be discharged. The NPDES permit generally includes the pollutant measurement and reporting requirements. Often times entities subject to compliance have a choice in which approved test method to utilize for a specific pollutant because the Agency has approved more than one method. These EPA-approved analytical methods must be used in applications for NPDES permits; sampling or other reports required under NPDES permits; other requests for quantitative or qualitative effluent data under the NPDES regulations; State CWA 401 certifications; and sampling and analysis required under EPA’s General Pretreatment Regulations for Existing and New Sources of Pollution.
According to the EPA these proposed changes would provide increased flexibility for the regulated community in meeting monitoring requirements while improving data quality. This proposed rule is open for comment on or before April 24, 2023.
Key to remember: The EPA is proposing updates to the required testing methods central to compliance under the NPDES permit program.

















































