According to correspondence at the DEQ, Pall was using USEPA Method 1624.

FORBES: Responsible Investing: Is Pall 'Leading' in Water Filtration? (Governor Snyder's Hometown has a 1,4 Dioxane Problem)

For years, Pall was providing excerpts from its sampling database to the DEQ.

FORBES: Responsible Investing: Is Pall 'Leading' in Water Filtration? (Governor Snyder's Hometown has a 1,4 Dioxane Problem)