Use the drop-down menu to view reports
required by MWRA's discharge permit.
Discharge (Effluent) Monitoring
MWRA monitors the effluent (treated sewage) that is
discharged into Massachusetts Bay, to ensure that it meets the standards
set out in the NPDES permit. In addition, to carry out the Detailed
Effluent Characterization studies required by the Ambient Monitoring
Plan, MWRA uses more sophisticated methods than the permit requires
to detect low levels of contaminants. Analytical support to the
effluent monitoring program is provided by the Department
of Laboratory Services.
Plant Performance Data(PDF) Monthly data on the Deer Island Treatment Plant's effluent discharges.
Measurements of fecal coliform bacteria, suspended solids, oxygen
depleting materials, and chlorine residual are included.
Contingency Plan Quarterly
Report on Effluent Monitoring Summary of data on pH, fecal coliform, toxicity, oil and grease,
and nitrogen in Deer Island Treatment Plant effluent (treated wastewater)
that is discharged into Massachusetts Bay.
NPDES
Compliance Summary Report(PDF) This report, while not a regulatory requirement, provides a useful
documentation of influent and effluent quality trends over the course
of a fiscal year for the MWRA's Deer Island Treatment Plant and
Combined Sewer Overflow facilities.
Outfall Monitoring Overview This report includes discharge monitoring program results for the
latest year's effluent data. Results are compared to Contingency
Plan thresholds.
Many of our reports are in PDF format, which requires Adobe
Acrobat Reader®, a free program available from Adobe
Systems. To request a paper copy of any report, please contact
the MWRA Environmental Quality Department at 617-788-4601, or e-mail us at web.enquad@mwra.state.ma.us.
