Plumbers in Dorchester, Boston, MA | Savin Hill to Neponset

Where

Savin Hill · Fields Corner · Codman Square · Ashmont · Adams Village · Neponset · Port Norfolk · Clam Point · Columbia Point · Uphams Corner · Grove Hall · Lower Mills · Meeting House Hill · Four Corners · Bowdoin-Geneva · Polish Triangle · Jones Hill · Popes Hill · Cedar Grove

ZIP 02121, 02122, 02124, 02125

Water & sewer

BWSC, a commission created by the state legislature and separate from City Hall, runs the pipes under Dorchester's streets. Report no water or a break at (617) 989-7900, day or night; billing questions go to 617-989-7800.

Official page

Permits & inspections

Boston ISD handles plumbing permits for every neighborhood. A homeowner can't apply, so your licensed plumber pulls it and has to be there for the inspection (ISD inspections: 617-635-5300).

Official page

Dorchester's three-deckers, ZIP code by ZIP code

Dorchester's housing is split almost evenly four ways. Of its 15,918 residential buildings, not counting government-owned property, Wikipedia's breakdown shows 27.3% single-family, 23.1% two-family, 24.6% three-family and 25.0% condominium. Victorian streetcar-suburb houses came first, then the three-deckers; Clam Point still has a group of Italianate mansard houses. The table below covers the four ZIPs the City lists for Dorchester; part of Lower Mills uses 02126, which is mostly Mattapan.

ZIP 02122 has the highest share of pre-1940 homes among the Boston neighborhood ZIP codes on this site, and in 02122 and 02124 the median home falls in the 1939-or-earlier bracket. In 02121 more than a quarter of units (28.5%) are in buildings of 5 to 19 apartments, and fewer than one household in four owns its home, so landlords make most of the repair calls there.

A three-decker usually stacks its kitchens and bathrooms one above the other, so one drain stack and one water service carry all three floors. A slow leak on the third floor tends to appear as a stain on the second, and a clog low in the stack can back up into the first-floor tub. After a century of piecemeal repairs, new pipe often meets old in these houses, so when a plumber quotes a fix, ask about the condition of the pipe on either side of it.

ZIP	Housing units	Built 1939 or earlier	In 3-4 unit buildings	Owner-occupied
02122	10,133	60.0%	43.4%	44.8%
02124	21,365	54.2%	35.1%	41.4%
02125	15,307	49.8%	44.3%	34.9%
02121	11,429	48.2%	37.7%	23.2%

U.S. Census Bureau ACS 2020-2024 estimates. ZIP areas don't line up exactly with neighborhood boundaries.

Morrissey Boulevard, Port Norfolk and stormwater inland

Along the bay, the Dorchester Reporter described Morrissey Boulevard in October 2018 as already prone to flooding at high tide. In December 2019 a city consultant said low-lying Harbor Point and Port Norfolk flood in intense storms, and that inland flood pathways run through stretches of Morrissey Boulevard and Clam Point. Climate Ready Boston's 2016 projections put about 170 Dorchester structures in the path of a 1% annual-chance coastal flood in the near term, rising to roughly 4,500 as soon as the 2070s.

For now, rain reaches far more of the neighborhood than the tide does. In a 10-year, 24-hour storm, Dorchester has more land exposed to stormwater flooding than any other part of Boston: 330 acres (9%) in the 2030s to 2050s and 410 acres (11%) later in the century, with South Dorchester named among the areas most affected. The same study found that Boston's drainage system already struggles to carry a storm of that size. When the pipes in the street are full, water looks for the lowest opening, which is often a basement floor drain, shower or laundry tub, even miles from the shore.

A backwater valve keeps that sewage out. The state plumbing code calls for one in any building with fixtures below the top of the sewer manhole cover that serves it, and the owner installs and maintains it. Remember too that in Boston the whole sewer lateral, from your basement to the BWSC main, is the owner's to repair, though BWSC offers a once-a-decade grant toward a blocked, collapsed or leaking lateral it has verified. Our sewer line repair page walks through both jobs.

Lead pipes and BWSC help for one- to three-family homes

BWSC cautions that exterior water connections made before 1950 may contain lead, which describes a large share of Dorchester's houses. In fall 2025 testing, Boston homes with known lead service lines had a 90th-percentile lead level of 22.5 parts per billion, above the 15 ppb action level, with 4 of 33 samples over. BWSC says it replaced about 448 private and public lead services in 2025 and aims to have all of them out by the end of 2032.

Owners pay nothing for the private stretch if the service qualifies: it must be 2 inches or smaller and contain lead, the water account must be active and paid up, and there can't be a major obstacle such as a porch, stairs, a wall or a fence in the way. Replacements generally happen between April and October. Call the Lead Hotline at 617-989-7888, or read our lead pipes guide first.

For leaks rather than lead, BWSC's Leak Up To Owner program covers one- to three-family homes with a service of 2 inches or less. BWSC repairs the leak on the owner's side of the service and lets you pay for it in 24 installments on the water bill; ask Operations at 617-989-7900. One more seasonal note: BWSC scheduled overnight water-main flushing in Roxbury and Dorchester from September 1 to October 18, 2026, between 10 PM and 6 AM, and says any discolored water it causes is temporary and not harmful.

What Dorchester callers usually need

Plumbing in Dorchester: questions

Will BWSC replace the lead pipe to my Dorchester house for free?

Often, yes. BWSC replaces the owner's portion at no cost when the service is 2 inches or smaller and contains lead, the account is active and not delinquent, and nothing like a porch, wall or stairs blocks the work. Replacements usually run April to October. Call the Lead Hotline at 617-989-7888.

My water service is leaking on my side of the property line. Who fixes it?

In Boston, the owner is responsible for the private service from the property line into the building. For a one- to three-family home with a service of 2 inches or less, BWSC's Leak Up To Owner program will make the repair and let you pay over 24 installments on your water bill. Call 617-989-7900.

Why was my water discolored in Dorchester this fall?

BWSC flushed water mains in Roxbury and Dorchester overnight, 10 PM to 6 AM, from September 1 to October 18, 2026. It says the discoloration is temporary and not harmful. If you lose water entirely, call BWSC's 24-hour line at (617) 989-7900.

Plumbers in Dorchester