Nebraska Administrative Code
Topic - HEALTH AND HUMAN SERVICES SYSTEM
Title 179 - PUBLIC WATER SYSTEMS
Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs)
Section 179-24-008 - CONDITIONS REQUIRING INCREASED MONITORING
Current through September 17, 2024
008.01 If a system is required to monitor at a particular location annually or less frequently than annually under 179 NAC 24-004 or 179 NAC 24-006, the system must increase monitoring to dual sample sets once per quarter (taken every 90 days) at all locations if a TTHM sample is > 0.080 mg/L or an HAA5 sample is > 0.060 mg/L at any location.
008.02 A system is in violation of the MCL when the LRAA exceeds the 179 NAC 24 MCLs in 179 NAC 2-002.04E2a, calculated based on four consecutive quarters of monitoring (or the LRAA calculated based on fewer than four quarters of data if the MCL would be exceeded regardless of the monitoring results of subsequent quarters). A system is in violation of the monitoring requirements for each quarter that a monitoring result would be used in calculating an LRAA if the system fails to monitor.
008.03 A system may return to routine monitoring once the system has conducted increased monitoring for at least four consecutive quarters and the LRAA for every monitoring location is <= 0.060 mg/L for TTHMs and <= 0.045 mg/L for HAA5s.
