Other Clean Water Act Test Methods: Chemical

Not Approved Under 40 CFR Part 136

In addition to developing and approving methods for use in compliance monitoring, the EPA may develop methods to support studies of specific industries (e.g., the Effluent Guidelines program) or for use in broad national surveys. If such studies or surveys lead to regulatory limits of new contaminants, the EPA approves the applicable methods for nationwide or industry-specific use through rulemaking which includes an opportunity for public comment.

Although the following methods are not in regulations developed by the EPA, they may be of interest to regulated entities, permitting authorities, and the public. The presence of a method here does not imply a regulatory requirement for its use.

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• Method 1634: 6PPD-q by using Liquid Chromatography with Tandem Mass Spectroscopy (LC/MS/MS) (January 2024)
• Method 1628: PCB Congeners by Low-Resolution GC-MS (July 2021)
• 200.13: Determination of Trace Elements in Marine Waters by Off-Line Chelation Preconcentration with Graphite Furnace Atomic Absorption (pdf) (288.41 KB, November 1992)
• 200.15: Determination of Metals and Trace Elements in Water by Ultrasonic Nebulization Inductively Coupled Plasma-Atomic Emission Spectrometry; Rev. 1.2 (pdf) (399 KB, 1994)
• 1614A: Brominated Diphenyl Ethers in Water, Soil, Sediment, and Tissue by HRGC/HRMS (pdf) (916.37 KB, May 2010, 821-R-10-005)
• 1630: Methyl Mercury in Water by Distillation, Aqueous Ethylation, Purge and Trap, and Cold Vapor Atomic Fluorescence Spectrometry (pdf) (392.92 KB, August 1998)
• 1632: Chemical Speciation of Arsenic in Water and Tissue by Hydride Generation Quartz Furnace Atomic Absorption Spectrometry; Rev. A (pdf) (135.46 KB, August 1998)
• 1636: Determination of Hexavalent Chromium by Ion Chromatography (pdf) (119.97 KB, January 1996)
• 1637: Trace Elements in Ambient Waters by Off-Line Chelation Preconcentration and Stabilized Temperature Graphite Furnace Atomic Absorption (pdf) (243.81 KB, January 1996)
• 1638: Trace Elements in Ambient Waters by Inductively Coupled Plasma—Mass Spectrometry (pdf) (194.82 KB, January 1996)
• 1639: Trace Elements in Ambient Waters by Stabilized Temperature Graphite Furnace Atomic Absorption (pdf) (190.88 KB, January 1996)
• 1640: Trace Elements in Water by Preconcentration and Inductively Coupled Plasma-Mass Spectrometry (pdf) (241.11 KB, April 1997)
• 1650: Adsorbable Organic Halides by Adsorption and Coulometric Titration; Rev. C (pdf) (205.06 KB, August 1997)
• 1654: PAH Content of Oil by HPLC/UV; Rev. A (pdf) (425.39 KB, December 1992)
• 1662: Total Extractable Material in Drilling Mud by SDS Extraction and Gravimetry (pdf) (117.09 KB, December 1992)
• 1663: Differentiation of Diesel and Crude Oil by GC/FID (pdf) (150.42 KB, December 1992)
• 1668C: Chlorinated Biphenyl Congeners in Water, Soil, Sediment, Biosolids, and Tissue by HRGC/HRMS (pdf) (1.54 MB, April 2010, 820-R-10-005)
• 1668A Interlaboratory Validation Study Report (pdf) (488.25 KB, March 2010, 820-R-10-004)
• Addendum to the Method 1668A Interlaboratory Validation Study Report (pdf) (50.64 KB, March 2010, 820-R-10-003)
• 1669: Sampling Ambient Water for Trace Metals at EPA Water Quality Criteria Levels (pdf) (145.61 KB, July 1997)
• 1694: Pharmaceuticals and Personal Care Products in Water, Soil, Sediment, and Biosolids by HPLC/MS/MS (pdf) (629.03 KB, December 2007, 821-R-08-002)
• 1698: Steroids and Hormones in Water, Soil, Sediment, and Biosolids by HRGC/HRMS (pdf) (462.64 KB, December 2007, 821-R-08-003)
• 1699: Pesticides in Water, Soil, Sediment, Biosolids, and Tissue by HRGC/HRMS (pdf) (899.73 KB, December 2007, 821-R-08-001)