(CBS) Tens of thousands of Ohio and West Virginia residents could be tested over the next year to determine if their health has been affected by drinking water containing a chemical used to make the nonstick substance Teflon.

DuPont Co. agreed in February to pay for the screenings to settle a class-action lawsuit. Teflon is one of the company's most popular products; the substance can be found in everything from cookware and clothing to car parts and flooring.

The tests will begin this month for residents who receive their drinking water from six public water districts, or from private wells within the districts, where concentrations of ammonium perfluorooctanoate, also known as PFOA and C8, have been found.

The water supplies are near DuPont's Washington Works plant, along the Ohio River near Parkersburg. About 80,000 residents live in the districts, and it's hoped at least 60,000 will participate in the screening.

“The more participants we have, the more valid the data is going to be,” said Dr. Paul Brooks, who will oversee the collection process with retired hospital administrator Art Maher. Both were appointed by the Wood County Circuit Court.

Residents will receive $150 to answer a health questionnaire. If they agree to submit a blood sample, they will receive an additional $250. Residents will walk out of the collection centers with a check, Maher said.

Only residents who received the water for at least a year before December 3, 2004, are eligible.

Each blood sample will be subjected to 51 tests, including those that check for the presence of C8, organ function and cancer markers. The screenings will not test for HIV, drugs or sexually transmitted diseases.

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