Drinking Water Quality

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Annual Water Report - 2021

CSO and SSO Notfications

Somerville Marginal

CSO and SSO Notifications

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Climate Change
Environmental Justice
Renewable Energy
CSO Control

Aqueduct Trails

Natick Trail

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


map courtesy townmapsusa.com

Wastewater COVID-19 Tracking

Updated: June 3, 2023

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PFAS Testing in MWRA Drinking Water

Updated March 2023

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We're Hiring!

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

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Temporary Fluoride Shutdown

As part of a project to replace portions of the fluoride feed piping and equipment at the Carroll Water Treatment Plant serving MetroWest and metro Boston communities, MWRA will need to shut down the fluoride feed for a few months starting in early March. While fluoridation is important for dental health, health officials indicate that this short-term shutdown does not require any special additional action by consumers.

See more details here.

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
Sign Up For Notifications

Want to know how your water quality is? Looking for updates on the MWRA construction project in your neighborhood? What if there is a water emergency in your area? MWRA can keep you informed when you're at home, at work or on the road. Take a few minutes to sign up and get notifications on your phone, by email, or text message.

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About Lead in
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How Much Water Is In Our Reservoirs?
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Recent and Historic Data
Harbor and Bay Monitoring
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Swearing In Ceremony

Governor Healey Swears in Louis M. Taverna and Paul E. Flanagan to MWRA Board of Directors

June 2, 2023

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Issue with MWRA Wind Turbine on Deer Island

Updated June 2, 2023

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Boston Harbor Islands Reel Fun Fishing Day at Deer Island

May 22, 2023

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MWRA to Hold Board of Directors and Personnel & Compensation Committee Meeting on May 24, 2023

May 22, 2023

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MWRA to Hold FY2024 Budget Hearings on May 24, 2023

May 22, 2023

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MWRA to Control Invasive Phragmites Spreading at Fells Reservoir

May 22, 2023

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MWRA Asks Residents: Please Don't Swim in the Fells

May 16, 2023

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MWRA Celebrates the 2023 Drinking Water Week

May 8, 2023

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MWRA Construction Work on Eastern Ave in Chelsea

May 5, 2023

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Announcing our 2022-2023 Poster and Writing Contest Winners!

April 25, 2023

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Joint Press Release - Charles River Basin Combined Sewer Overflow Control

April 14, 2023

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Joint Press Release - Alewife Brook/Upper Mystic Combined Sewer Overflow Control
Progress Update

April 14, 2023

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MWRA Contract W343 Weston Dam Instrumentation (Piezometers) Installation Starts Monday April 3, 2023

March 29, 2023

Swearing in photo

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

March 29, 2023

Swearing in photo

Update on Weston Aqueduct Supply Main Rehabilitation (WASM) - Arlington, Medford and Somerville (Contract 6544)

March 29, 2023

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

March 29, 2023

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

March 29, 2023

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

March 29, 2023

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

March 2, 2023

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Update on Wachusett Dam Bastion Improvements (Contract 7697)

March 2, 2023

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MWRA Mourns the Loss of John J. Carroll

February 28, 2023

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Ohio Derailment and Fire Not Affecting MWRA Water Quality

February 24, 2023

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MWRA To Temporarily Shutdown Fluoride System

February 16, 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

2021 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 FY23 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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