Section 611.7901  Analytical Requirements

a)         General.  

1)         Suppliers must use only the analytical methods this Section specifies, each incorporated by reference in Section 611.102, to demonstrate compliance with the requirements of this Subpart AZ.

2)         The following documents are incorporated by reference with the approval of USEPA in compliance with 5 U.S.C. 552(a) and 1 CFR part 51. This material is available for inspection at the EPA and at the National Archives and Records Administration (NARA).  Contact the USEPA's Drinking Water Docket at: 1301 Constitution Avenue NW., EPA West, Room 3334, Washington, DC 20460; phone: 202-566-2426. For information on the availability of this material at NARA, email: fr.inspection@nara.gov, or go to: www.archives.gov/federal-register/cfr/ibr-locations.  The material may be obtained from the USEPA at 1301 Constitution Avenue NW, the EPA West, Room 3334, Washington, DC 20460; phone: 202-566-2426; website: https://www.epa.gov/pfas/epa-pfas-drinking-water-laboratory-methods.

A)        EPA Method 533: Determination of Per- and Polyfluoroalkyl Substances in Drinking Water by Isotope Dilution Anion Exchange Solid Phase Extraction and Liquid Chromatography/Tandem Mass Spectrometry, 815-B-19-020, November 2019.

B)        Method 537.1, Version 2.0: Determination of Selected Per- and Polyfluorinated Alkyl Substances in Drinking Water by Solid Phase Extraction and Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS), EPA/600/R-20/006, March 2020.

b)         PFAS

1)         Analytical methods. Suppliers must measure regulated PFAS by the methods listed in the following Table 1:

Section 611.7901(b)(1) Table 1:  Analytical Methods for PFAS Contaminants

2)         Laboratory certification.  Analyses under this Section for regulated PFAS must only be conducted by laboratories that have been certified by USEPA or the Agency.  To receive certification to conduct analyses for the regulated PFAS, the laboratory must:

A)        Analyze Performance Evaluation (PE) samples that are acceptable to the Agency at least once during each consecutive 12-month period by each method for which the laboratory desires certification.

B)        Within 30 days of the effective date of this Subpart AZ, achieve quantitative results on the PE sample analyses that are within the following acceptance limits:

Section 611.7901(b)(2)(B) Table 1:  Acceptance Limits for PFAS Performance Evaluation Samples

C)        For all samples analyzed for regulated PFAS in compliance with Section 611.7902, report data for concentrations as low as the trigger levels as defined in Section 611.7902(a)(5).

BOARD NOTE:  This Section derives from 40 CFR 141.901

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