Dover is New Hampshire’s oldest permanent settlement, and its plumbing shows every era — from century-old service lines to brand-new city mains on Court Street. Plumbing Pros works across the Garrison City on groundwater-fed systems, aging drains, and winter-hardened pipework. Call (877) 401-2673 when Dover’s water misbehaves.

A Groundwater City With Centuries of Pipe

Dover drinks from underground. The city’s 2025 water quality report says residents receive their water from production wells drawing on four underground aquifers — a groundwater system, not a reservoir. That gives Dover water a different personality than the surface supplies of Concord or Manchester: mineral content that shifts with the aquifer, steady year-round temperature, and chemistry shaped by rock rather than runoff. For plumbing, that means scale on fixtures, sediment in heaters, and water that treats every home a little differently depending on which well field feeds the street.

Above ground, Dover is the oldest permanent settlement in New Hampshire, and its housing covers every era since. Downtown Victorians, Garrison Hill colonials, Dover Point capes, postwar neighborhoods to the south — the older the house, the more likely its service line and interior piping date to an era of lead, galvanized steel, or both. The city is currently completing a Lead Service Line Inventory of its system, cataloging exactly what connects homes to the mains. If your house predates the 1980s and nobody has ever told you what your service line is made of, that is worth finding out.

The public side of Dover’s water is getting renewed right now. The Court Street water main project has been replacing aging mains to improve reliability, and the utilities crew tracks breaks, leaks, and pressure issues across the distribution system month by month. But the city’s responsibility ends at the curb stop — the service line into your house, and everything past it, belongs to you. When the street gets a new main and your house still runs through a narrowing galvanized line, the bottleneck just moved indoors. We replace service lines and interior supply systems to match the renewed infrastructure outside.

Winters here carry a Seacoast edge. Cold air off the water finds unheated crawl spaces, foundation penetrations, and hose bibs the same way it does inland — and Dover Point’s exposure makes wind-driven cold a particular problem for pipes on exterior walls. Lines ice over, split quietly, and reveal themselves at the thaw. Our winter work in Dover focuses on the usual suspects: insulation where pipes run cold, working shutoffs on every exterior line, and a main valve you can turn without a wrench and a prayer.

Outside the city system, the surrounding towns run on private wells and septic — Somersworth, Rollinsford, Durham, Madbury, Barrington, and Lee all have streets where the homeowner owns the whole water cycle. Out there we service pumps, pressure tanks, treatment equipment, and the septic-side drains, with the same diagnostic discipline we bring to city jobs. One company, both sides of the curb stop, anywhere in the Dover area.

Dover’s Plumber for Old Pipes and New Mains

Four aquifers, four centuries of housing

When was the last time anyone looked at the pipe connecting your house to the street? In Dover, that pipe might be newer than the city main it joins — or it might be original to a house built before anyone kept those records. Plumbing Pros works the full span: lead and galvanized service line replacement, interior repipes in century-old homes, and modern installs in new construction going up around the city. Our technicians test water chemistry before recommending treatment, camera-inspect drains before quoting replacements, and put every scope in writing. Dover’s water comes from underground and its housing comes from every era — we are set up for both.

• Service-line specialists: from the curb stop to the meter, including lead and galvanized replacement.
• Groundwater fluency: treatment and equipment matched to aquifer-fed water, not generic city water.
• Century-home craft: plaster, tight basements, and original woodwork worked around, not through.
• Camera-first drain work: we look inside the line before we quote touching it.
• Written scopes only: options, sequence, and timing in plain language before approval.
• Clean job sites: contained work areas, hauled debris, and fixtures wiped down.

Why Dover Calls Plumbing Pros

The Garrison City’s plumbing, handled

• We read old houses: A downtown Victorian and a Dover Point cape fail in different places, and we know where to look first.
• Lead-line answers: With the city inventorying service lines, we identify what yours is made of and replace it when it is lead or failing galvanized.
• Mineral-minded: Groundwater scale and sediment get addressed at the source — treatment sized from a test, not a guess.
• Drain certainty: Camera inspections show you the break, the root intrusion, or the belly before you spend a dollar on the fix.
• Straight scheduling: Real arrival windows and a message when the technician is rolling — your day stays yours.
• Permits and code: Dover permits pulled where required, installs to code, paperwork you can keep.
• We stand behind it: If our work is not right, call (877) 401-2673 and we return to make it right.

Dover’s Most Common Plumbing Repairs

Lead or galvanized service lines past their prime

The pipe from the curb stop to your house is yours, and in Dover’s older neighborhoods it is often the oldest pipe on the property — lead in the very oldest homes, galvanized steel in mid-century ones. Symptoms are weak pressure house-wide, rusty water after the line sits, and seepage where the line enters the foundation. We expose the line, identify the material, and replace it with modern pipe in a single planned dig, coordinated so your water is off for hours, not days.

Groundwater minerals scaling fixtures and heaters

Dover’s aquifer-fed water carries dissolved minerals that surface supplies do not, and they settle where water sits hot or still: faucet aerators, showerheads, toilet fill valves, and the bottom of water heaters. The signs are white or rusty crust on fixtures, lukewarm showers from a scaled heater, and valves that need replacing too often. We test the water first, then right-size treatment — softening, filtration, or both — and descale or replace what the minerals already claimed.

Split pipes after Seacoast cold snaps

Cold air finds Dover’s unheated crawl spaces, exterior-wall runs, and forgotten hose bibs, and a line that ices over can split without a sound. The damage surfaces at the thaw: stained ceilings, hissing walls, a meter spinning with every tap closed. We find the break with minimal opening, replace the failed section with fittings suited to the location, and then winterize the run — insulation, a working exterior shutoff, hoses disconnected — so the next cold snap has nothing to work with.

Root-intruded and bellied sewer laterals

Dover’s mature street trees are beautiful and relentless. Older clay and Orangeburg laterals crack at the joints, roots follow the moisture in, and the line bellies where soil has settled — the classic recipe for slow drains and backups at the lowest fixture. We camera-inspect first so you see the intrusion yourself, then clear, repair, or replace the failed section. Spot repairs where the rest of the line is sound; full replacement where it is not.

Sump pumps overwhelmed by spring melt and storms

Low-lying Dover streets and high water tables make spring the sump pump’s busiest season — one failed float or dead backup battery during a melt or a nor’easter and the basement takes the water. We fit primary pumps with battery backup, check floats and valves ahead of the wet season, and route discharge lines so water ends up far from the foundation. A dry basement in April is arranged in October.

What Happens When You Call Us in Dover

1. You describe the symptom: Call (877) 401-2673 and tell us what is happening — the sound, the stain, the smell, the bill. We ask targeted questions and tell you honestly whether it needs a technician today or can wait for a scheduled visit.
2. We investigate, not guess: On site, the technician traces the problem to its source: pressure tests, visual inspection of accessible pipe, camera work in drains, acoustic listening for hidden leaks. You get the diagnosis in plain language before any talk of cost.
3. Written options, your call: Every viable fix goes in writing with its sequence and timing — repair now, replace later, or do it once and be done. You choose; we do not proceed until you approve the scope.
4. The work, done to code: We execute the approved scope to manufacturer spec and local code, with Dover permits where the job needs them. Floors and fixtures are protected, the work area stays contained, and every connection is tested before we pack up.
5. Show, explain, clean up: We show you what changed, point out the new shutoffs and cleanouts, and explain what to watch going forward. Then the debris leaves with us and the area is wiped down — the job is not done until the house looks untouched.

Where We Work Around Dover

From the brick downtown to the water’s edge, Plumbing Pros serves Dover and the towns around it. In the city we cover downtown and the central neighborhoods, Garrison Hill, Dover Point, the south side, and the north end toward the Bellamy River. Nearby communities are on the route too: Somersworth, Rollinsford, Durham, Madbury, Barrington, and Lee — including the well-and-septic streets where the city system ends and the homeowner owns the whole water cycle. Covered ZIPs include 03820, 03821, and 03822. Whether your water rises from one of Dover’s four aquifers or from your own backyard well, the technician who arrives understands groundwater plumbing and carries the parts these jobs need. Each appointment comes with a real arrival window, and no work begins until you have approved the written scope. Don’t see your ZIP code? Call (877) 401-2673 and we’ll confirm coverage, from Garrison Hill to Dover Point, for every street in the Garrison City we serve.

Zip Codes We Serve in Dover

03820, 03821, 03822

Testimonials

Our service line was original galvanized from the 1950s and the pressure had been fading for years. They replaced it in one day, coordinated everything, and the water runs like a new house now.

Tree roots had been choking our sewer line every spring. They ran a camera, showed me the intrusion on the screen, and replaced just the bad section. Two years and not a single backup since.

The water heater quit on a Sunday morning and they had a new one in by afternoon — sized right, piped clean, and the old tank gone when they left.

Frequently Asked Questions

How is plumbing work priced in Dover?

Scope, materials, access, the condition of the existing system, permits, and timing — emergency or scheduled. Replacing a service line under a paved driveway is a different job than swapping a faucet in an open basement. We diagnose first and quote a written scope; call (877) 401-2673 for yours.

Where does Dover’s water come from?

From underground. Dover’s 2025 water quality report says the city’s drinking water comes from production wells drawing on four underground aquifers — no reservoir. Aquifer water runs mineral-heavy compared to surface supplies, which is why Dover homes see more scale on fixtures and sediment in heaters. A water test tells you exactly what your street’s supply carries.

How do I know if my service line is lead?

The city is completing a Lead Service Line Inventory, which may already have your street cataloged — but the surest check is a look at the pipe where it enters your house. Lead is dull gray, soft enough to scratch with a key, and often has a bulb-shaped connection at the wall. If your home predates the 1980s and the line has never been replaced, have us identify it. Lead replacement is straightforward and permanent.

Why do my fixtures keep crusting over?

Dissolved minerals in Dover’s groundwater settle wherever water sits hot or still — aerators, showerheads, fill valves, heater tanks. If you are replacing faucet cartridges every year or your shower pressure keeps fading, the water is telling you something. We test it, then size softening or filtration to what the test shows, so you treat the cause instead of the symptom.

What should I do about tree roots in my sewer line?

Do not just keep clearing them — every clearing buys months while the intrusion gets worse. A camera inspection shows exactly where roots enter and how bad the pipe is around them. If the line is otherwise sound, we repair the bad section; if roots have found multiple joints, replacement ends the cycle. Either way, you see the footage before you decide.

How do I protect my pipes during a Dover winter?

Insulate runs in crawl spaces and along exterior walls, disconnect every hose before the first hard cold, and verify your main shutoff turns — Dover Point’s wind makes exterior-wall pipes especially vulnerable. When the temperature bottoms out, leave cabinet doors ajar under sinks on outer walls and let the most exposed faucet run a thin stream. And know where the main is before January, not during.

Do you service well and septic homes around Dover?

Yes. Somersworth, Rollinsford, Durham, Madbury, Barrington, and Lee all have streets beyond the city mains, and we handle the full private system: well pumps, pressure tanks, treatment equipment, and the household drains up to the septic tank. One call covers city water and well water alike.

My basement takes water every spring — what actually fixes that?

Usually a sump system that is undersized, aging, or missing backup power. We check the pump’s capacity against the inflow, test the float and check valve, and add battery backup so a storm outage does not become a flood. We also verify the discharge line carries water well away from the foundation — pumping it out just to have it run back in is the most common sump failure we see.

Local Weather Risk

Strafford County has recorded the following severe weather events since 2015, per NOAA's National Centers for Environmental Information:

• Thunderstorm Wind: 42 recorded events (2015–2025)
• Hail: 9 recorded events (2015–2023)
• Flash Flood: 3 recorded events (2016–2021)
• Flood: 3 recorded events (2022–2022)

Source: NOAA NCEI Storm Events Database.

Our Services

• Backflow Prevention Testing & Installation Near Me — Call for pricing
• Bathroom Plumbing Remodel Near Me — Call for pricing
• Bathtub Repair & Installation Near Me — Call for pricing
• Burst Pipe Repair Near Me — Call for pricing
• Commercial Plumbing Services Near Me — Call for pricing

Other Service Areas in New Hampshire

• Rochester
• Portsmouth
• Manchester
• Concord
• Nashua
• All New Hampshire Service Areas