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As required under the Clean Water Act section 304(h), EPA is amending existing regulations to provide regulated entities with more options for measuring pollutants in wastewater. This is a routine update the Office of Water performs every 3 to 5 years. This regulatory action will amend "Guidelines Establishing Test Procedures for the Analysis of Pollutants" at 40 CFR part 136 and approve test procedures (analytical methods) for use in testing water for certain constituents. The EPA's regulations require the use of these methods when measurements of waste constituents are required in applications for National Pollutant Discharge Elimination System (NPDES) permits or for reports required under NPDES permits. The regulation will also revise, clarify, and correct errors and ambiguities in existing methods