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Boston Harbor and Massachusetts Bay
Massachusetts Water Resources Authority

Contingency Plan Exceedances

MWRA's NPDES discharge permit requires MWRA to report to regulators and the public any exceedances of thresholds detailed in the Contingency Plan which is part of the permit. These reports are triggered by unusual results of effluent or ambient monitoring. Effluent monitoring takes place in the treatment plant, while ambient monitoring examines the environment surrounding the site of MWRA discharge in Massachusetts Bay.

See all Contingency Plan exceedances.