The federal Environmental Protection Agency Tuesday announced it has approved a Superfund site project to clean up groundwater in part of a basin in Fullerton, Anaheim and Placentia.

The Superfund designation for the North Basin Groundwater Cleanup Project is a “big step forward in protecting an essential drinking water source for generations to come,” said EPA Regional Administrator John Busterud.

Groundwater in the basin was contaminated with industrial degreasing chemicals from the early 1960s through the mid-1980s, according to the Orange County Water District. The contamination is about five miles long and up to two miles wide, according to the district.

Officials estimate it will cost $100 million to clean up, said Orange County Water District board member Denis Bilodeau.

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