My Water
- Status
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- What is Flushing?
- Current Flushing Schedule
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- ESWA Monitoring
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- Lead Overview
- Water Quality Reports
TTHM & HAA5 Monitoring
Trihalomethanes (TTHM) and Halo acetic Acids (HAA5) are by-products of disinfection. The PA Department of Environmental Protection requires the testing of four samples per quarter to verify maximum contaminant levels of less than 0.080 mg/L for TTHM and 0.060mg/L for HAA5.
However, if the running annual average of TTHM or HAA5 is less than 75% of the maximum contaminant level, DEP can reduce the required monitoring to one sample per quarter. Because of its continued low levels of TTHM and HAA5, ESWA has been on a DEP-sanctioned reduced monitoring schedule of one sample per quarter for TTHM and HAA5 since 2005.