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The Stage 2 Disinfection Byproducts Rule (DBPR) was promulgated in January 2006 and applies to all community and non-transient non-community (NTNC) water systems that add a primary or residual disinfectant other than ultraviolet light (UV) or deliver water that has been treated with a primary or residual disinfectant other than UV. Systems that purchase disinfected water are included in this rule.
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