401 KAR 8:250. Inorganic chemical sampling for drinking water.

The system shall collect one sample at initiation of water system operation.  Thereafter, the system shall collect one sample during the first three-year compliance period of each nine-year compliance cycle (2002-2004, 2011-2013, etc). 

If the system is vulnerable to asbestos contamination due to raw water source only, the system shall sample from the entry point to the distribution system. 

If the system is vulnerable to asbestos contamination due to raw water source and distribution system (e.g., asbestos-cement pipe), the system shall sample in the distribution system under conditions where asbestos contamination is most likely to occur. 

If a sample exceeds the maximum contaminant level (MCL) of 7 million fibers per liter, the system shall initiate quarterly monitoring. 

A surface water system shall sample for a minimum of four consecutive quarters with results less than the MCL.  A groundwater system shall sample for a minimum of two consecutive quarters with results less than the MCL. Afterwards, with Drinking Water Branch approval, the system may return to base monitoring requirements. A confirmation sample collected within two weeks at the same sampling point as an MCL exceedance may be averaged with the first sample to determine compliance.