Frequent Questions

Does the Stage 1 Disinfectant and Disinfection Byproducts Rule (Stage 1 DBP) apply to ground water systems?

The Stage 1 DBP applies to all CWSs and NTCWSs that use a disinfectant to treat the water, as well as TNCWSs that use chlorine dioxide. Systems serving less than 10,000 persons and all ground water systems that use a disinfectant must comply with the Stage 1 Rule beginning January 1, 2004 (Stage 1 Disinfectants and Disinfection Byproducts Rule: A Quick Reference Guide, EPA816-F-01-010, May 2001).

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