MassDEP has revised WSC-CAM-X A, Quality Control Requirements and Performance Standards for the Analysis of Per- and Polyfluoroalkyl Substances (PFAS) by Liquid Chromatography/Dual Mass Spectrometry (LC-MS/MS) in Support of Response Actions under the MCP, now posted at https://www.mass.gov/info-details/compendium-of-analytical-methods-cam#pfas-methods.

For aqueous samples with elevated levels of total suspended solids, Section 1.6 of the CAM Protocol was updated to clarify that the solvent rinse should be performed with the typical solvent used for the extraction of solid materials (e.g., methanolic ammonium hydroxide).

Effective January 29, 2026, this revised CAM protocol, WSC-CAM-X A, replaces the previous version of the PFAS CAM document, WSC-CAM-X A (effective date, September 30, 2025). Refer to WSC-CAM-I A for an overview of the CAM process. Please note that while this protocol must be followed on and after the effective date of January 29, 2026 for the purpose of “Presumptive Certainty,” the protocol may be used optionally prior to its effective date upon its publication on October 29, 2025.