Analytical Method Source
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Chlorophyll Methods
- Applicability of Chlorophyll a Methods (DEP/SAS/002/10, May 2026)
SW-846 Methods
Test Methods for Evaluating Solid Waste, Physical/Chemical Methods
40 CFR Part 136.3 Methods List
- Full list of approved methods at 40 CFR Part 136.3
- Download method files at https://www.epa.gov/measurements/collection-methods#2
EPA Method Update Rules
- Federal Register, 5/19/21
- Federal Register, 4/16/24 (Note: 2023 MUR not yet incorporated in Department Wastewater Rule.)
40 CFR Parts 141 & 143 Methods
National Primary Drinking Water Regulations
National Secondary Drinking Water Regulations
Clean Water Act (CWA) Analytical Methods for testing water
National Environmental Methods Index (NEMI)
Use this link to search all chemical, microbiological, biological, toxicity, and physical methods in NEMI
US Geological Survey (USGS) Methods for testing (Field and Lab)
APHA Standard Methods
Standard Methods for the Examination of Water and Wastewater methods list
ASTM Methods (American Society of Testing Materials)
AOAC Methods
Official Methods of Analysis text by the Association of Analytical Communities
Petroleum Methods
**The DEP FL-PRO method was revised as of November 2018. Please visit the FL-PRO Revision page where you can read a summary of the changes included in the revised method.**
Un-ionized Ammonia SOP - Discussion of the calculation of this species