The Fourth Circuit Court of Appeals denied a petition to appeal an earlier ruling...denying the residents the opportunity to file a class-action suit against DuPont.
The group claims the city's water was contaminated by a chemical the company uses at its Washington Works plant to manufacture Teflon.
An earlier federal ruling said the residents could sue the company individually... but not as a group.
DuPnt issued a statement agreeing with the decision, saying there was no basis for a review of the appeal of the earlier ruling.
"We agree with the court's ruling that there was no basis for appellate review of U.S. District Judge Goodwin's ruling," said Washington Works Spokeswoman Robin Ollis.
Te company has already settled a 2001 class-action case involving C8,
with residents living in six water districts, near the Wshington Works plant.