In August 2001, Bilott filed a class action lawsuit against DuPont on behalf of the approximately 70,000 people in West Virginia and Ohio with PFOA-contaminated drinking water, which was settled in September 2004, with class benefits valued at over $300 million, including DuPont agreeing to install filtration plants in the six affected water districts and dozens of impacted private wells, a cash award of $70 million, and provisions for future medical monitoring to be paid by DuPont up to $235 million, if an independent science panel confirmed "probable links" between PFOA in the drinking water and human disease.