Frequent Questions

Can a system receive 40/30 certification if individual samples exceed 40/30 levels, but annual averages for TTHM and HAA5 are below these levels?

No, a system cannot receive 40/30 certification if any samples exceed 40/30, even if the system?s averages are below 40/30. For additional guidance on the Stage 2 Disinfectants and Disinfection Byproducts rule please visit
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