Frequent Questions

Which systems are required to perform OEL evaluations? It seems this is only required for those near the MCL.

All systems subject to Stage 2 requirements on quarterly monitoring must perform an OEL calculation in the 3rd quarter after beginning Stage 2 TTHM/HAA5 monitoring and every subsequent quarter. If the OEL has been exceeded, the system must report the exceedance to the state, conduct an OE, and turn in an OEL report within 90 days.
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