Location(s) for Measurement of Filtered Water Turbidity. This policy provides the criteria by which EPA Region 8 determines whether filtered water turbidity is being measured in the appropriate location(s) for determining compliance with the Surface Water Treatment Rules. Turbidity is measured by turbidimeters (which meet the analytical requirements of 40 CFR 141.74(a)).You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
- Surface Water Treatment Rule Policy #5 (PDF)(6 pp, 241 K, 02/12/2020)