Analytical requirements for per- and polyfluoroalkyl substances

Analytical requirements for per- and polyfluoroalkyl substances. (1) Detection limits. For purposes of this section, “detection limit” means greater than or equal to the following concentration for each contaminant in Table Dd. (2) Analytical requirements. (a) Analytical methods. A PWS must measure regulated PFAS using the methods listed in Table De. (b) Laboratory certification. Analyses under this section for regulated PFAS must only be conducted by laboratories that have received department certification under ch. NR 149 or have been certified by the EPA or the department. To receive certification to conduct analyses for the regulated PFAS, the laboratory must comply with all of the following: 1. Analyze performance evaluation samples that are acceptable to the state at least once during each consecutive 12-month period using each method for which the laboratory desires certification. 2. Achieve quantitative results on the performance evaluation sample analyses that are within the acceptance limits shown under Table Df. 3. For all samples analyzed for regulated PFAS in compliance with s. NR 809.223 , report data for concentrations as low as the trigger levels as defined under s. NR 809.223 (1) (f) . (3) Sample collection. Samples must be collected using containers and preservatives and meet the holding times specified in Table Dg. When an approved method that is not included in Table Dg is used to analyze samples, samples must be collected using containers and preservatives and meet the holding times specified in the approved method. In all cases, samples should be analyzed as soon as possible after collection.