BOSTON -- For over a quarter of a century, the Environmental Protection Agency has been cleaning up Nyanza, a toxic waste dump that's on the government's Superfund list. Up until 1978, dye companies discharged toxic chemicals into the groundwater and nearby brooks and rivers.

But new EPA report shows pollution is still a problem.

Two years ago, Team 5 Investigates reported on one of the final stages of the Nyanza Super Fund cleanup. Vapor mitigation systems were installed in residences near the polluted property. They were designed to protect people from a contaminated groundwater plume that spread underneath their homes.

"They collect all the vapors beneath the floor," EPA Project manager Jim DiLorenzo told Team 5 two years ago, "and send them out before folks have a chance to inhale them."

But a new EPA report says eight of the 43 mitigation systems tested may not be performing to EPA standards. And there may be more problems, since the state's Department of Environmental Protection has only inspected 30 of the buildings so far.

An EPA official said a plan is in the works to remove the toxins from the water, but it could take years. In the meantime, the official said, the public health is not at risk.

The EPA and DEP are also still trying to clean up the mercury tainted Sudbury River, 26 miles away from the capped off Nyanza site.