Section 611.592  Frequency of State Monitoring

This Section applies to State-only MCLs marked as "additional State requirements" in Section 611.300 and for which there are no specific monitoring, reporting, or public notice requirements among the NPDWRs.

a)         A CWS supplier using surface water sources must repeat analyses for the State-only MCLs at yearly intervals.

b)         A CWS supplier using groundwater sources must repeat analyses for the State-only MCLs at three-year intervals.

BOARD NOTE:  This is an additional State requirement.

(Source:  Amended at 47 Ill. Reg. 16486, effective November 2, 2023)