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Lead service lines in Boston, MA

25 water utilities serve Boston, with approximately 682,895 people served.

Last verified from EPA SDWIS + utility inventories: 2026-04-14
Known lead
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Galvanized
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Unknown
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% unknown
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Lead Service Lines in Boston, MA

Boston's water is delivered by the Boston Water and Sewer Commission (part of the Massachusetts Water Resources Authority, or MWRA) to about 676,000 residents, plus 25 smaller water systems serving the remaining population. The city has a long history of water infrastructure—much of it built in the late 1800s and early 1900s—when lead service lines were standard.

What we know about lead in Boston's water system

The MWRA and other water systems serving Boston have not yet published a complete inventory of lead service lines in the city. This means the exact number of homes connected by lead pipes is unknown. However, given Boston's age and the prevalence of lead lines in older northeastern cities, it is reasonable to assume some homes are affected.

Massachusetts requires all water utilities to provide lead service line information to customers upon request, and to test water in homes at risk. The MWRA has been sampling lead levels and providing guidance to residents for years.

Why this matters

Lead enters drinking water when it leaches from service lines, solder, or fixtures—not because the water itself is contaminated. Even low levels of lead exposure can affect children's development. If you have a young child or are pregnant, this is worth taking seriously.

The good news: lead in water is preventable. Testing is simple, and there are concrete steps you can take right now.

Next steps for residents

  • Contact the MWRA directly at 617-242-6000 or visit their website to ask about the lead service line status of your address. They can tell you whether your building is on a known or suspected lead line.
  • Request a free lead test from your water utility if you haven't had one recently. Testing takes a few minutes and costs nothing.
  • Use a filter if you're concerned. NSF-certified filters reduce lead; the MWRA can recommend products.
  • Have your water tested for lead if you have young children or are pregnant. Contact your pediatrician or the local health department for guidance.

Utilities serving Boston

Common questions

Does Boston have lead in the water?

Lead can be present in Boston water if your home is connected by a lead service line. The exact number of affected homes is not yet known. Testing is the only way to know if your water contains lead.

How do I know if my house has a lead service line?

Contact the Boston Water and Sewer Commission at 617-242-6000 with your address. They can tell you whether your property is on a known or suspected lead line, or arrange a free test.

Is it safe to drink tap water in Boston?

The MWRA treats water to reduce lead leaching and monitors it regularly. If you're concerned about lead, request a free test. Filters and simple precautions (like flushing the tap) can also reduce exposure.

What should I do if lead is found in my water?

Contact your pediatrician if you have young children or are pregnant. The MWRA and local health department can advise on filters, service line replacement programs, and next steps.