Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 611 - PRIMARY DRINKING WATER STANDARDS
Subpart F - MAXIMUM CONTAMINANT LEVELS (MCLs) AND MAXIMUM RESIDUAL DISINFECTANT LEVELS (MRDLs)
Section 611.300 - State-Only MCLs for Inorganic Chemical Contaminants

Universal Citation: 35 IL Admin Code ยง 611.300

Current through Register Vol. 48, No. 38, September 20, 2024

a) The State-only MCLs listed in subsection (b) for inorganic chemical contaminants (IOCs) are additional State requirements. The State-only MCLs apply only to CWS suppliers. The supplier must determine compliance with the State-only MCLs for inorganic chemicals under Section 611.612.

b) State-only MCLs for IOCs

Contaminant

Level, mg/L

Iron

1.0

Manganese

0.15

Zinc

5.

c) This subsection corresponds with 40 CFR 141.11(c), marked as reserved by USEPA. This statement maintains structural parity with the federal rules.

d) Nitrate

A non-CWS may exceed the MCL for nitrate under certain circumstances:

1) The nitrate level must not exceed 20 mg/L;

2) The water must not be available for consumption by children under six months of age;

3) The NCWS supplier complies with the public notification requirements under Section 611.909, including continuous posting that the nitrate level exceeds 10 mg/L with the potential health effects of exposure;

4) The supplier annually notifies local public health authorities and the Department of Public Health of nitrate levels exceeding 10 mg/L; and

5) No adverse public health effects result.

BOARD NOTE: This subsection (d) derives from 40 CFR 141.11(d). The Department of Public Health regulations may impose a nitrate limitation requirement at 77 Ill. Adm. Code 900.50.

e) Supplementary conditions apply to the MCLs for iron and manganese in subsection (b):

1) A CWS supplier serving a population of 1,000 or fewer or 300 service connections or fewer are exempt from the standards for iron and manganese.

2) The Agency may issue a SEP allowing iron and manganese in excess of the MCL if sequestration proves effective on an experimental basis. If sequestration is not effective, the supplier must provide positive iron or manganese reduction treatment, as applicable. A supplier may try experimental use a sequestering agent only if the Agency approves in a SEP.

BOARD NOTE: This subsection (e) is an additional State requirement.

Disclaimer: These regulations may not be the most recent version. Illinois may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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