Stage 2 Disinfection Byproduct Rule Proposal . Stage 1 Disinfection Byproducts Rule (DBPR). DBP MCLs: TTHM 80 ug/L as a running annual average (RAA) HAA5 60 ug/L as an RAA Bromate 10 ug/L as a RAA Enhanced Coagulation/Softening Treatment Technique requirement.
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* Sys 500-9,999: State may determine that highest HAA5 & highest TTHM are at same location.
** Sys <500: State may determine that highest HAA5 & highest TTHM are at different locations.