In addition to requiring sampling and analysis for any PFAS for which there is a state maximum contaminant level (MCL) as defined in Env-Dw 700 or AGQS as defined in Env-Or 603.03, upon written request by the department, a responsible party shall be required to sample and test for PFAS analytes and any PFAS or PFAS precursor, detectable by the following methods:

1. (a) EPA Method 533, November 2019, referenced in 40 CFR Part 141 and available as noted in Appendix B;
2. (b) EPA Method 537.1 Version 2.0, March 2020, referenced in 40 CFR Part 141 and available as noted in Appendix B; and
3. (c) EPA Method 1633A, December 2024, in EPA Document EPA 820-R-24-007, available as noted in Appendix B.

Source. #14159, eff 12-25-24; ss by #14419, eff 11-4-25, EXPIRES: 11-4-35