Does a public water system (PWS) serving fewer than 10,000 persons that purchases all it's water from a wholesaler and adds a small amount of chlorine to maintain disinfection in the distribution system need to comply with the Stage 1 Disinfectant and Dis
The Stage 1 D/DBP rule applies to all community water systems (CWSs) and nontransient, noncommunity water systems (NTNCWSs) that add a chemical disinfectant to the water during any part of the treatment process. The PWS must begin compliance with the Stage 1 D/DBP rule on January 1, 2004 (40 CFR 141.130(a)(1) and (b)(1)).
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