Frequent Questions

How should systems monitor during the interval between the end of IDSE monitoring and the beginning of Stage 2 DBPR compliance sampling?

Systems must continue Stage 1 DBPR monitoring and could work with their primacy agency to begin Stage 2 DBPR compliance sampling earlier than required.  This interval is built into the Stage 2 DBPR to accommodate systems that may need to make large changes to their distribution system to meet the requirements of the Stage 2 DBPR.

For additional guidance on the Stage 2 Disinfectants and Disinfection Byproducts rule please visit

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