Section 611.7900  General Requirements

a)         The requirements of this subpart constitute the national primary drinking water regulations (NPDWRs) for PFAS.  Each CWS and NTNCWS supplier must meet the requirements of this subpart including the maximum contaminant levels for the PFAS identified in Section 611.311(c).

b)         The deadlines for complying with the provisions of this subpart are as follows:

1)         Each supplier must meet the analytical requirements in Section 611.7901 within 30 days of the effective date of this Subpart.

2)         Each supplier must report the results of initial monitoring, as described in Section 611.7902 (b)(1), to the Agency by April 26, 2027.

3)         Each supplier must meet the compliance monitoring requirements in Section 611.7902(b)(2) by April 26, 2027.

4)         Each supplier must meet the MCL compliance requirements in Section 611.7903 by April 26, 2029.

5)         Each supplier must meet the reporting and recordkeeping requirements in Section 611.7904 by April 26, 2027.

6)         Violations described in Section 611.7905 include monitoring and reporting violations and violations of MCLs.  Monitoring and reporting violations may be assessed beginning on April 26, 2027.  MCL violations may be assessed beginning on April 26, 2029.

BOARD NOTE:  This Section derives from 40 CFR 141.900.

(Source:  Added at 50 Ill. Reg. 2531, effective February 17, 2026)