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We publish laboratory analytical methods that are used by industries and municipalities to analyze the chemical, physical, and biological components of wastewater and other environmental samples that are required by regulations under the authority of the Clean Water Act (CWA). All of these methods are published as regulations in the Code of Federal Regulations (CFR) at Title 40 Part 136. More information….
Approved Methods
Compliance methods to measure pollutants in various media for many Clean Water Act applications.Other Approved Methods
Compliance methods specific to pharmaceutical manufacturing and pesticide active ingredients.Other Methods
Methods published by EPA, but not promulgated.
Alternative Test Procedures
Approval & validation process for submitting new test methods or procedures for EPA approval.Detection & Quantitation
Procedures to confirm laboratory performance.Method Updates
Revises the list of approved analysis and sampling procedures.
Solutions to Analytical Chemistry Problems with Clean Water Act Methods (PDF) (458 K, 62 pp., About PDF) This EPA document is a revision of the "Pumpkin Book". It represents significant improvements to the earlier document because it includes more information on inorganic chemistry; specific references to regulatory text that supports a performance-based approach to method modifications, and offers updated solutions to analytical problems. Fact Sheet about the Revised "Pumpkin Book" (April 10, 2007)