Lead

Lead can leach into tap water if the service line that connects your home to the water mains in the street is made of lead. The pipes that carry water in the street are made of iron or steel, and do not add lead to your water. If you have concerns about your service line, you should contact your local water department.

Lead also can get into tap water if you have lead pipes in your home. Lead can also enter tap water if you have lead solder or brass fixtures in your home. Corrosion or wearing away of lead-based materials can add lead to tap water, especially if water sits for a long time in the pipes before use.

To reduce your potential exposure, you should always use fresh, cold, running water for drinking and cooking. You should always buy plumbing fixtures that have zero- or low-lead levels. Read the labels of any new plumbing fixtures closely. Get your water tested.

Here are more steps you can take:

• Be careful of places you may find lead in your home. Paint, soil, dust and some pottery may contain lead.
• Run tap water until after the water feels cold. Then fill a fresh pitcher with fresh water and place in the refrigerator for future use.
• Never use hot water from the faucet for drinking or cooking, especially when making baby formula or food for infants.
• Ask your local water department if there are lead service lines leading to your home.
• Call the Massachusetts Department of Public Health (1-800-532-9571) for health information, or visit their website.
• Get your home's water tested at a lab that is DEP Certified to test household tap water for lead.

Infants and young children are typically more vulnerable to lead in drinking water than the general population. It is possible that lead levels in your home may be higher than levels in other homes in your community as a result of materials used in your home's plumbing. Infants and children who drink water containing lead in excess of the action level could experience delays in their physical or mental development. Children could show slight deficits in attention span and learning disabilities. Adults who drink this water over many years could develop kidney problems or high blood pressure. If you are concerned about lead levels in your home's water, you may wish to have your water tested. Flush the water until after the water is cold before you use it.

The best way to find out if your household tap water contains lead is to get your water tested by a lab that is DEP Certified to test household tap water for lead. DEP Certified Labs reliably test water at an affordable cost. Mail-in and drop-off options are available. Visit our DEP Certified Lab page for a list of labs and helpful links.

MWRA has made the water less corrosive, thereby reducing the leaching of lead into drinking water. In 1996, MWRA began operating a facility in Marlborough where sodium carbonate and carbon dioxide are added to adjust the water's pH and buffering capacity. This change has made the water less likely to leach lead from the pipes.

Lead levels in found in sample tests of tap water have dropped by over 90% since this treatment change. Also, local water departments are working to decrease lead corrosion by replacing existing lead service lines

MWRA Board Approves $100 Million in Funding to Remove Lead Service Lines

More Information on the Program for Community Officials and Program Guidelines

A service line is the pipe that connects your house to the water main in the street. Some service lines that run from older homes (usually those built before 1940) to the utility water main are made from lead.  Over time, many of these older used service lines have been replaced, but your home could still have one.

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How to Tell if You Have a Lead Service Line

To determine if your home has a lead service line you (or your plumber) need to inspect the service line. 

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Lead service lines are generally a dull gray color and are very soft. You can identify them easily by carefully scratching with a key. If the pipe is made of lead, the area you've scratched will turn a bright silver color. Do not use a knife or other sharp instrument and take care not to puncture a hole in the pipe.

Ownership of the lead service line is typically shared between homeowners and your local water department. The homeowner typically owns the section of the pipe that is under the homeowner’s property.

There may be MWRA communities that have already eliminated their lead water service lines. Check with your local water department to find the status in your community.

Image credits

(1) Water service line illlustration courtesy American Waterworks Association

(2, 3) Lead service line photos courtesy EPA Region 5

But not just lead service lines can add lead to your water.  Certain galvanized steel pipes can have lead present in the zinc coating, and may also have a short section of lead pipe (called a gooseneck or pig tail) flexibly connecting the service line to the water main.  If your pipe is difficult to scratch but is silvery, it may be a galvanized pipe.  You can use a magnet to check as galvanized pipes are magnetic. 

There can also be iron pipes that are lined with lead.  You can use the same scratch and magnet test as for galvanized pipes. You can also check with your local water department if they are aware of any service lines in your area that are lined with lead.

Whether you have a galvanized or lead lined service line, it’s still a good idea to replace it. Both can add lead to your water.

When replacing lead service lines, it is best to replace the entire lead service line.  The surest way to remove concerns about lead from lead service lines is to get all the lead out by removing the entire service line. 

If a pregnant woman or child lives at your home, replacing the lead service line can be an important way to reduce the potential for lead exposure. 

The actual cost of service line replacement reflects a number of factors including the length of the service line, the technique used to install the new service line, and the environment where the service line is located.

Please contact your city or town water department to learn more about options for lead service line replacement and any payment assistance possible. Below are links to further information from some of our service communities.

• Boston: BWSC at 617-989-7000 or visit the following links: BWSC Lead Replacement Incentive Program (PDF), BWSC Lead Service Map.
• Framingham
• Newton
• Malden
• Quincy
• Marblehead
• Wakefield

Starting on April 1, 2016 MWRA, in coordination with the Department of Environmental Protection (DEP), provided no cost lab analysis and technical assistance for schools and day care centers across all of MWRA’s water communities. Many communities worked with DEP on the testing, while others used private labs. Almost all MWRA communities participated in the program, and sample tests and assistance are still on-going.

DEP: Search for Lead and Copper Drinking Water Results in Schools/Childcare

DEP: More information on programs related to lead in schools

Some results also may be available through your local community website, DPW, or school department.

MWRA Meets Lead Standards

Under U.S. EPA rules, each year, MWRA and your local water department must test tap water in a sample of homes that are likely to have high lead levels. These are usually homes with lead service lines or lead solder. The EPA rule requires that 9 out of 10, or 90%, of the sampled homes must have lead levels below the Action Level of 15 parts per billion (ppb).

The most recent sampling round, once again, meets the Lead Action Level. Results from lead and copper samples collected in September 2022 show that 95% of the targeted high-risk homes had lead levels equal to or below the Lead Action Level (AL) of 15 parts per billion (ppb), meeting the requirement of at least 90%. The 90% value was 7 ppb. MWRA, as a system, has met 27 straight rounds.

Even though lead results across the MWRA system were below the Action Level, your home or your community may have higher results. If your community had results above the Action Level, you will receive information from your local water department with more information. If your home has a lead service line, you should work with your water department to replace it.

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90% Lead Levels in MWRA System of Fully-Supplied Communities: Sept. 2022.

The most recent sampling round, once again, is below the Lead Action Level.

Go to more Sampling Results

For MWRA households, average water and sewer costs are approximately one cent per gallon. Most homes in the service area do not have lead issues with their tap water. Also, simply running your tap until the water is noticeably colder, after the water has been sitting for several hours, is usually a much cheaper and effective alternative to a filter or bottled water. Some water filtration systems do not remove lead. Before you purchase a filter, you should verify the manufacturer’s claim. A good resource is the National Sanitation Foundation (1-877-867-3435). If your water has elevated levels of lead after flushing, bottled water is also an option, but it may cost as much as 1,000 times more than tap water.

MWRA conducts hundreds of thousands of tests per year on over 120 contaminants.

Monthly Test Results | Annual Test Results

Lead and Faucets Q&A

Lead Service Line Replacement (LSLR) Collaborative

The Lead Service Line Replacement (LSLR) Collaborative, a diverse coalition of 23 national public health, water utility, environmental, labor, consumer, housing and state and local government organizations, released an online toolkit designed to help communities across the United States accelerate removal of lead service lines. Removing these lead pipes provides an opportunity to significantly reduce the risk of exposure to lead in drinking water. The Collaborative's toolkit includes a road map for getting started, suggested practices to identify and remove lead service lines in a safe, equitable, and cost-effective manner, policies that federal and state leaders could adopt to support local efforts, and links to additional resources that may be helpful when developing local programs.  LSLR Collaborative Communication Guide

Frequently Asked Questions about MWRA Drinking Water

Flint Water Crisis: Impacts and Lessons Learned

Testimony by Stephen Estes-Smargiassi, MWRA Director of Planning and Sustainability for American Water Works Association before the House Subcommittee on Environment and the Economy and Subcommittee on Health, April 13, 2016.

Testimony provided to Congress by MWRA on behalf of the American Waterworks Association, March 11, 2005.

MWRA Testimony on Lead Before the Boston City Council Committee on Health and Human Services, December 1, 2005.