Serving Somerville, MA
Plumber in Somerville, MA
Somerville Plumbers Who Understand the City's Density and Its Housing Age
Cod Plumbing serves Somerville homeowners, landlords, and condo owners with fast, professional Somerville plumbing service. Somerville packs more than 20,000 people into every square mile, the highest density in Massachusetts, and roughly two out of every three homes here predate 1940.
Plumber in Somerville
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Plumbing Services in Somerville, MA
Somerville just finished the final phase of its Lead Service Line Replacement Program in 2025, a project that started with 449 identified lead lines back in 2019 and worked through four phases at no cost to homeowners. Combine that with a housing stock where more than 54 percent of units sit in duplexes and triple deckers, and you get a city where plumbing work is almost always about density.
Call us at 857-426-3836 or schedule online to book your Somerville plumbing service today. We offer same day appointments and a two hour guaranteed arrival window.
Services We Provide in Somerville
Local Knowledge
Somerville Housing Stock and Plumbing History
Somerville is the most densely populated city in Massachusetts, packing roughly 83,000 residents into just under 4.2 square miles. Between 63.8 and 66 percent of housing units were built before 1940, and the triple decker, locally the defining three family building type, along with duplexes, makes up 54.5 percent of the city's housing according to Somerville's 2025 housing needs assessment. Until a zoning change in November of 2023, the city actually prohibited building new triple deckers in most of Somerville, which means almost the entire existing stock dates to between 1880 and 1939. East Somerville, the most affordable part of the city near the Mystic River, has some of the oldest housing stock along with a significant immigrant community and rapid new investment since the Green Line Extension opened. Winter Hill, on elevated ground above the Mystic, is densely packed with triple deckers largely built no later than 1939. Davis Square and West Somerville carry a similar prewar housing base but at a higher price point, while Union Square, Magoun Square, and Gilman Square have all seen new development pressure from their new GLX stations layered on top of a prewar triple decker core that has not changed nearly as fast.
Water Supply
Water Quality and Supply in Somerville
Somerville is an MWRA member community, drawing from the Quabbin and Wachusett Reservoirs and treated at the John J. Carroll plant with ozone, ultraviolet light, and corrosion control chemistry designed specifically to reduce lead and copper leaching. That treatment matters given how much of Somerville's housing predates 1940. The city launched its Lead Service Line Replacement Program in 2019 after an initial inventory identified 449 lead lines, 3.6 percent of the city's total service connections. The program ran in four phases: 69 residences in 2021, 102 in 2022, 76 more of 131 investigated between 2023 and 2024, and the final phase completed in 2025, all at no cost to the homeowner. Somerville joined the federal National Lead Service Line Replacement initiative in 2023 to help fund the work through Bipartisan Infrastructure Investment and Jobs Act dollars. If your Somerville home was part of the original 449 identified lines and has not yet come up in the replacement schedule, it is worth confirming your status directly with the city.
What We See Most
Common Plumbing Issues in Somerville
Based on years of plumbing work throughout Somerville, these are the issues we diagnose and repair most often in the neighborhood.
Shared Laterals in Triple Deckers Across Winter Hill and Union Square
A single sewer lateral typically serves all three units in a Somerville triple decker, and with more than half the city's housing sitting in duplexes and triple deckers, root intrusion and grease buildup in these shared original clay or cast iron lines is one of the most common calls we get. When the lateral fails, it takes down all three floors at once.
Remaining Lead Service Lines Outside the Completed Program
Somerville's Lead Service Line Replacement Program identified 449 lead lines in 2019 and completed its final phase in 2025 at no cost to homeowners. If your home was not part of the original inventory, or if you are unsure of your status, we can inspect the visible service line material at your meter, arrange lead pipe replacement in Somerville if the line qualifies, and help you confirm your status with the city.
Deferred Maintenance in East Somerville and Winter Hill Rentals
With 66.4 percent of Somerville units renter occupied, plumbing failures are usually reported by tenants rather than caught during routine owner maintenance, and multiple decades of patched, not properly repaired, fixes are common in the older rental stock concentrated in East Somerville and Winter Hill.
New Construction Tie Ins Near the Green Line Extension
New residential buildings along the GLX corridor in Union Square, Gilman Square, and Ball Square require entirely new plumbing systems installed against a backdrop of surrounding triple deckers that are a century old. Tie in work for these new units is a growing share of our Somerville service calls.
Neighborhoods We Serve in Somerville
Our licensed plumbers work throughout Somerville and surrounding communities. If you do not see your neighborhood listed, give us a call.
Need a Plumber in Somerville?
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Questions
Plumbing Questions from Somerville Homeowners
Is Somerville's lead service line program finished?
Yes. Somerville launched the Lead Service Line Replacement Program in 2019 after identifying 449 lead lines citywide, 3.6 percent of all service connections. The program ran through four phases, replacing 69 homes in 2021, 102 in 2022, 76 more in the 2023 to 2024 phase, and finishing the remaining properties in 2025, all at no cost to the homeowner. If you are unsure whether your address was covered, a plumber in Somerville MA can check the service line material at your meter in about fifteen minutes.
My triple decker in Winter Hill has a drain backup hitting all three units. What is going on?
That is the classic signature of a failed shared sewer lateral. Winter Hill's triple deckers, most built no later than 1939, run a single lateral out to the street serving all three floors, and when root intrusion or grease buildup blocks it, every unit backs up at the same time. A camera inspection shows exactly where the lateral is failing.
How dense is Somerville compared to other Greater Boston cities, and does that affect plumbing?
Somerville is the most densely populated city in Massachusetts at roughly 20,000 people per square mile. That density comes from small multifamily buildings, primarily triple deckers, which make up 54.5 percent of the city's housing. Shared plumbing systems, shared laterals, and buildings where one failure affects multiple households are simply more common here than almost anywhere else we work.
I rent in East Somerville and my landlord has not fixed a slow drain in months. Is that normal?
Unfortunately it is common. With 66.4 percent of Somerville's housing renter occupied, deferred maintenance is a structural feature of the rental market here, and East Somerville in particular has some of the city's oldest housing stock. We document plumbing conditions clearly, which tenants and landlords both find useful when there is a dispute about what needs fixing.
Does Somerville still have galvanized supply pipe in its triple deckers?
Yes, in many of the buildings that make up the roughly two thirds of Somerville's housing built before 1940. Original galvanized supply lines corrode from the inside as they age, restricting flow and eventually producing rust tinted water, especially in triple deckers where the supply riser has never been replaced.
What changed with triple decker construction rules in Somerville?
Until November of 2023, Somerville's zoning code actually prohibited building new triple deckers in most of the city. That changed as part of Somerville's compliance with the state's MBTA Communities law, and new triple decker construction is now encouraged. The existing stock, though, dates almost entirely to between 1880 and 1939, so the plumbing challenges we see day to day are still rooted in that older construction.
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$99
Drain Clean Special
Whether it is a stubborn shower drain clog, a kitchen sink backup, or any bathroom drain causing problems, our expert drain technicians can get your Boston home flowing again quickly. Family owned. No salespeople. Guaranteed.
What to Expect:
- Two hour arrival window.
- Upfront pricing with no hidden fees. A tech will inspect your drain and provide pricing before work begins.
- Free camera inspection included with exterior cleanout access to confirm the line is clear.
$399
Plumbing Inspection
Buying a home or checking the condition of your plumbing? Our plumbing inspection checks for leaks, pressure concerns, failing fixtures, water heater issues, and other visible plumbing problems.
What to Expect:
- Inspect all visible pipes, shutoffs, and water heater.
- Test water pressure and flow.
- Identify slow drains or potential leaks.
- Provide a detailed report with findings.
- Included free for Cod Club members.
$199
Water Heater Maintenance
Routine maintenance helps your standard tank water heater run more efficiently and extends its service life. Cod Plumbing flushes and inspects your water heater so small problems are easier to catch early.
What to Expect:
- Drain tank and remove sediment buildup.
- Inspect anode rod and thermostat.
- Help reduce the risk of corrosion and tank leaks.
- Recommended annually for best results.
- Ask about whole home water filtration systems.
Let's Get Your Plumbing Back on Track
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