and Massachusetts Bay
MWRA monitors water quality at the outfall location in Massachusetts
Bay where treated sewage, or effluent, is discharged. This sampling program
is termed Ambient Monitoring, because sampling is focused on the ambient,
or surrounding waters at the outfall, as well as more distant locations. The program is detailed in the Ambient Monitoring Plan, which is attached to MWRA's NPDES discharge permit. The Plan is monitored by state and federal regulators, as well as by the Outfall Monitoring Science Advisory Panel (OMSAP). The NPDES permit allows MWRA to propose interim modifications to the Ambient Monitoring Plan at any time.
6/5/20: Interim request for modifications to the permit-attached Ambient Monitoring Plan.
Monthly Bacteria Monitoring at the Outfall
Recent measure of sewage indicator bacteria, fecal coliform and Enterococcus,
around the outfall and elsewhere in Massachusetts Bay.
Quarterly Ambient Monitoring
The results of all monitoring required by the ambient monitoring plan
or the Bays
Eutrophication Model must be reported quarterly to regulators, OMSAP,
and the National Marine Fisheries Service.
Contingency Plan Quarterly Report
on Ambient Monitoring
Data on mussel contamination, dissolved oxygen, and algae at sampling
locations in Massachusetts Bay, compared with threshold limits in MWRA's Contingency
Ambient monitoring plan for the Massachusetts Water Resources Authority effluent outfall revision 2. July 2010
Monitoring Plan for the Massachusetts Water Resources Authority Effluent
Outfall, Revision 1, March 2004
Study of Flounder Skin Lesions
In the April 2003 flounder survey, an increased number of flounder ulcers
were recorded, with the highest prevalence in Western Massachusetts Bay.
The condition was absent from Eastern Cape Cod Bay. The Outfall Monitoring
Science Advisory Panel recommended further study of this condition. MWRA
designed a study to further investigate the possible causes of these ulcers.