Drinking Water Quality

MWRA Annual Water Quality Report

Annual Water Report - 2022

CSO and SSO Notifications

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CSO and SSO Notifications

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Climate Change
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Aqueduct Trails

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About the Aqueduct Trails
What Not to Flush
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It's a toilet, not a trash can!

Massachusetts Water Resources Authority
Deer Island, 33 Tafts Avenue
Boston, Massachusetts 02128

(617) 242-6000


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Wastewater COVID-19 Tracking

Updated: December 1, 2023

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PFAS Testing in MWRA Drinking Water

Updated March 2023

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MWRA has a number of job openings. Be part of a team that works to protect public health and the environment.

Important Notice


No current updates.

MWRA 24-Hour
Emergency Contacts
Water: 617-305-5950
Sewer: 617-305-5940
Security: 877-697-6972
TTY: 617-371-1903
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About Lead in
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How Much Water Is In Our Reservoirs?
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How much we have
How much we use

Recent and Historic Data
Harbor and Bay Monitoring
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Facts about Fluoride
MWRA's Free Drinking Water Fountain


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MWRA Advisory: Valve Exercise Maintenance in the Greater Boston Area

December 1, 2023

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MWRA Valve Repair May Cause Discolored Water in Areas of Medford and Somerville

November 21, 2023

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Announcing the 2023-2024 Poster & Essay Contest

November 21, 2023

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MWRA to Hold Board of Directors Meeting on November 15, 2023

November 13, 2023

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Virtual Joint Meeting on CSO Control Planning on November 15, 2023

November 13, 2023

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MWRA to Hold OPEB Meeting Notice for November 8, 2023

November 3, 2023

Chestnut Hill drawdown

MWRA to Temporarily Lower Water Level at Chestnut Hill Reservoir for Invasive Plant Control

October 30, 2023

Foss Resevoir drawdown MWRA to Temporarily Lower Water Level at Foss Reservoir for Invasive Plant Control

October 30, 2023

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Update on Section 23, 24 and 47 Water Mains - Boston and Newton (Contract 6392)

October 10, 2023

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Update on Section 89 Northern Intermediate High Pipeline Replacement: MWRA Contract 7117

October 10, 2023

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MWRA to be featured in upcoming volume of the Boston Society of Civil Engineers Section Civil Engineering Practice Journal

September 26, 2023

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MWRA Water Given “People’s Choice Award” at New England Water Works Association Conference

September 19, 2023

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Burlington Admitted Into the MWRA Water System

September 8, 2023

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Public Notice - Chelsea Traffic Light Project

September 8, 2023

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Update on Northern Extra High Pressure Zone Improvements - Section 63: Contract 6522

July 18, 2023

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Update for Nut Island Odor Control and HVAC Improvements: MWRA Contract
(Contract 7548)

July 11, 2023

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Update on Weston Aqueduct Supply Main PRV Improvements (Contract 7563)

June 13, 2023

News Release Archive Page


Welcome To Deer Island Pier

Updated November 1, 2021

Visit our YouTube page here

SCATV Video Screen Shot

Mystic River Watershed Association Fighting Back Against Water Chestnut Invasion (via SCATV)

July 29, 2014

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Well vs. MWRA Water Taste Test
on Boston.com

July 22, 2013

Boston Globe Soudtrack Image

Boston Globe Magazine's Soundtrack video captures the "hypnotic sight and sound" of MWRA's Charlestown Wind Turbine

March 18, 2013

Power of Windmills Courtesy The Travel Channel

The Power of Windmills: Deer Island windmill featured in the Travel Channel's "Off Limits" clip

October 17, 2011

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NECN Presents Underneath it All:
Inside Boston's Sewer System

October 17, 2011

More Videos on Our YouTube Page

Water Reports

MWRA Annual Water Quality Report

2023 Annual Drinking Water Test Results


Monthly Drinking Water Quality Update


Monthly Community Water Use Report


Monthly Water Supply Status Update


Report on Quabbin Pilot Program (PDF)



Sewer Reports

MWRA Every Drop Counts

How Clean is Boston Harbor?

April 23, 2018

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A Healthy Environment Starts at Home

Our free guide to reducing the use of hazardous household products (PDF)

Annual Industrial Waste Report


CSO Post Construction Monitoring and
Performance Assessment Reports


CSO Annual Report: CSO Discharge Estimates and Rainfall Analyses for Calendar Year 2021


How Clean is Boston Harbor? MWRA Sewer Report


CSO Discharge Estimates and Rainfall Analyses


Annual CSO Control Plan Progress Report


Annual Infiltration/Inflow Report (PDF)



Harbor, Bay and NPDES Reports

State of Boston Harbor Report


Financial Reports

Preliminary FY 2024 Assessments to Communities (Rates)


Final FY23 Capital Improvement Program (CIP)


Final FY24 Current Expense Budget (CEB)


Information for Investors and Capital Finance Business Partners


MWRA Annual Comprehensive Financial Report For the Fiscal Years Ended June 30, 2022 and 2021



Organization and Management Reports

Board of Directors Quarterly Report on Key Indicators of MWRA Performance


Master Plan



Court Report


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