Free Chlorine Distribution System Influent Hold Study Protocol
This document provides an approach that a drinking water system may use to simulate free chlorine decay (and/or disinfection by-product formation (DBP)) in the distribution system.
This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2025. This website is no longer updated and links to external websites and some internal pages may not work. More information »