|MWRA posts recent treatment plant performance and environmental quality reports on the What's New page. Many of these are required by the NPDES discharge permit.
|| MWRA measures environmental conditions in the Bays such as nutrients, metals, and algae blooms. Monitoring results are compared with pre-discharge baseline data, to help assess any impact of the discharge.
| MWRA implements a best management practices plan to minimize contamination in runoff from the Deer Island Treatment Plant, headworks stations, Combined Sewer Overflow treatment facilities, and sludge pelletizing plant.
| The Contingency Plan in the NPDES permit sets out Caution and Warning level thresholds for monitoring results that mandate further studies to detect any potential harm to Mass. Bay from effluent discharges. MWRA reports exceedances of the thresholds. The annual Outfall Monitoring Overview compares
effluent and field data results
from the previous year with these thresholds.
| MWRA is subject to an average dry day flow limitation of 436 million gallons per day. This annual report assesses the effectiveness of demand management programs and water conservation efforts done by communities in the service area, to keep flow within limits.
prohibits discharges into the MWRA system for groundwater
remediation activities. Any proposed changes to this rule must be posted online. There are currently no proposed changes.
| MWRA regulates discharges from certain business or industrial sewer users and prescribes limits for both the quantity and quality of discharged substances. MWRA must develop and enforce these limits to prevent pollutants from causing problems with permit compliance or system operations.
|MWRA routinely maintains the sewage treatment and sludge pelletizing plants and submits to regulators annual status reports and a report on infiltration/inflow reduction efforts. MWRA also must report when there is an operational incident or upset at an MWRA facility.
|The Outfall Monitoring Science Advisory Panel (OMSAP) advises the US Environmental Protection Agency (EPA) and DEP on scientific and technical matters related to MWRA's bay outfall and any potential impacts of the discharge on its receiving waters. Materials from OMSAP Meetings are available online.
• Pollution Prevention Plan: addresses the quality of wastewater before it enters MWRA's sewerage system.
• Industrial Waste Report: documents efforts to implement the requirements of 40 CFR Part 403, General Pretreatment Regulations.
• A Healthy Environment Starts at Home: a guide to hazardous household substances, and their water quality effects.
|MWRA must provide at least a 30-day prior notice of any significant change in the volume or character of pollutants being introduced into the treatment plant that may cause the discharge to exceed water quality standards in the receiving water.
|The Archive page provides access to past environmental quality reports. |