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Clean Water Act Analytical Methods
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Approved CWA Radiochemical Test Methods

Related Information
  • Questions and Answers about Approved Methods
The analytical methods promulgated under Clean Water Act section 304(h) are sometimes referred to as the "304(h)" or "Part 136" methods. The methods measure chemical and biological pollutants in media, such as wastewater, ambient water, sediment, and biosolids (sewage sludge). These various CWA methods are tested in a variety of labs and matrices.
 
In addition to Part 136 methods, some approved industry-specific methods are published or incorporated by reference at 40 CFR Parts 401 through 503.
 

  • 900.0: Gross Alpha and Gross Beta Radioactivity in Drinking Water (pdf) (1980)
  • 903.0: Alpha-Emitting Radium Isotopes in Drinking Water (pdf) (1980)
  • 903.1: Radium-226 in Drinking Water (Radon Emanation Technique) (pdf) (1980)
  • CWA Methods Home
  • PFAS Methods
  • Methods Update Rules
  • Approved Chemical Methods
  • Approved Microbiological Methods
  • Approved WET Methods
  • Approved Radiochemical Methods
  • Approved Industry-Specific Methods
  • Other CWA Methods: Chemical
  • Other CWA Methods: Microbiological
  • Other CWA Methods: Biosolids
  • Alternate Test Procedures
  • Regulatory History
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Last updated on July 22, 2020