The action was brought by the U.S. Environmental Protection Agency ( EPA ) and the Massachusetts Department of Environmental Protection ( MassDEP ) .
The town of Billerica exceeded allowable effluent limits for phosphorus .
The action was brought by the U.S. Environmental Protection Agency ( EPA ) and the Massachusetts Department of Environmental Protection ( MassDEP ) because the town of Billerica exceeded allowable effluent limits for phosphorus .