35 Ill. Adm. Code 611.592
Frequency of State Monitoring
Section 611
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.