Not later than two years after the date of the enactment of the National Defense Authorization Act for Fiscal Year 2022, the Secretary of Defense shall complete preliminary assessment and site inspection testing for perfluoroalkyl substances and polyfluoroalkyl substances at all military installations and facilities of the National Guard located in the United States that are identified as of March 31, 2021, as having a release of perfluoroalkyl substances or polyfluoroalkyl substances.

Testing conducted under subsection (a) shall provide at least a preliminary basis for determining whether additional environmental response actions are necessary to address contamination from a perfluoroalkyl substance or polyfluoroalkyl substance.

When testing for perfluoroalkyl substances or polyfluoroalkyl substances under subsection (a) or any other provision of law, the Secretary shall use a method to measure for all perfluoroalkyl substances or polyfluoroalkyl substances in drinking water that has been validated by the Administrator of the Environmental Protection Agency.