EPA Method 1633 is the multi-laboratory validated method for per- and polyfluoroalkyl substances, covering roughly 40 compounds including PFOA, PFOS, PFHxS, PFNA, PFBS, GenX, and the fluorotelomer and sulfonamide precursors. This kit applies it to surface water. Each compound is reported individually with its own detection and reporting limit.

PFAS are the contaminant class where the method designation matters most. 1633 is the method state agencies, consultants, and litigators expect to see, which is why a result from it can be used in a conversation that a screening test could not survive.