Chlorine disinfection for potable water uses in facilities regulated as “public water systems” under the U.S. Safe Drinking Water Act (or equivalent regulations outside of the US) is allowed. The US EPA defines public water systems as those that have at least 15 service connections, or regularly serve at least 25 individuals. For these facilities, chlorine disinfection may be required for regulatory compliance. However, to use this Exception, the manufacturer must exhaust all regulatory appeals short of legal appeals. The chlorine added should be the minimum amount allowed by the code. In addition, the manufacturer must include and document point-of-use dechlorination with a 0.5 micron carbon block filter or other approved dechlorination method.
