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Leak Detection

Water and Gas Leak Detection and Repair in Greater Hartford, CT

A leak you cannot see is still doing damage. Hidden water leaks run behind walls, under basement floors, and through buried service lines, and they usually show up on your water bill well before they show up on your ceiling. Boisvert Plumbing & Mechanical Services handles leak detection and repair for homeowners across Hartford, West Hartford, Bloomfield, Windsor, Avon, Simsbury, and Farmington. We are licensed, insured, and BBB-accredited with an A+ rating.

Our licensed technicians start with the least invasive test that can answer the question, then work toward the leak instead of guessing. That means reading your meter, isolating sections of the system, pressure testing what can be isolated, and listening for pressurized water before anyone opens a wall or digs a trench.

If you smell gas right now, get everyone outside and call the utility before you call a plumber. For water leaks, we’re available 24/7.

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What Kinds of Leaks Does a Plumber Actually Fix?

Boisvert Plumbing & Mechanical Services repairs six kinds of residential leaks: concealed supply lines inside walls and floors, the buried water service line between the meter and the house, fixture and appliance connections, gas piping, water heater and boiler leaks, and pipes that split from freezing. Where the water is coming from decides both the tools and the repair, which is why the first call is diagnostic rather than a quote.

The leaks we take care of most often:

  • Hidden supply line leaks
    Copper and galvanized supply lines develop pinhole leaks as they corrode from the inside out. In a finished basement or behind tile, the first sign is usually a stain, a musty smell, or a soft spot in drywall rather than visible water. We locate the run, confirm the leak, and open the smallest area that gets us to it.

  • Buried water service line leaks
    A leak here can move a remarkable amount of water without a drop of it ever reaching your basement, which is why it usually turns up as an unexplained bill instead of a wet floor. This is the line running from your meter or curb stop to the house, and locating it accurately is the difference between one small excavation and a trenched-up front yard.

  • Fixture, valve, and appliance connection leaks
    Shutoff valves, supply hoses, toilet connections, and the lines feeding a washing machine or dishwasher all fail eventually, and they tend to fail slowly. These are the cheapest leaks to fix and the most expensive to ignore.

  • Gas line leaks
    Once the utility has made the situation safe and shut the gas off at the meter, we repair or replace the gas piping itself, including lines running to ranges, dryers, water heaters, boilers, and outdoor grills. Read the gas section below before you call anyone.

  • Water heater and boiler leaks
    A weeping tank, a dripping pressure relief valve, or a leaking boiler fitting is a different job from a leak inside a wall. If the water is coming from the appliance rather than the piping, start on our water heater page.
  • Frozen and burst pipe leaks
    A pipe that froze and split often doesn’t leak until it thaws. The lines most at risk run through unheated space: crawl spaces, garages, exterior walls, and the hose bib on the north side of the house. If a fixture stopped producing water during a freeze, shut the main before it thaws and call us.

If water is backing up rather than escaping, that is a drain problem instead of a leak, and it belongs on our drain cleaning page. Not sure which one you have? Call and describe what you’re seeing. We would rather ask two questions on the phone than send out the wrong truck.

How to Tell If You Have a Hidden Leak

95% of household water leaks are at a toilet, according to the water utility that bills Greater Hartford for the water. Another 4.5% of leaks are outside at a hose bib or an irrigation head, and only 0.5% are the buried service line or other concealed piping.

MDC’s own toilet test takes twenty minutes and costs nothing. Put a few drops of food coloring in the upper tank, leave it alone for fifteen to twenty minutes, and then look in the bowl. If the water in the bowl has changed color, that toilet is leaking and you just found your problem without a service call. Do the same walk-through on sinks, tubs and showers, and other appliances.

The other test needs no tools at all. Turn off every fixture and appliance in the house, then find your meter and watch the leak indicator, usually a small triangle or dial that spins on any flow at all. If it moves with everything off, water is going somewhere.

If you’re on MDC water, the same eight-town district also handles your sewer, so a bill spike and a slow drain can start to look like the same story from the kitchen. They are not. Water escaping the system is a leak. Water that will not leave is a drain issue. If the water is coming from the tank itself, start with water heaters. And if nothing has failed yet but the whole run is at the end of its life, that is a repiping conversation instead.

Signs of a Hidden Water Leak

  • A water bill that jumped with no change in how you use water

  • The sound of running water when every fixture in the house is off

  • Stains, soft spots, or a musty smell on walls, ceilings, or floors

  • Water pressure that dropped off across the whole house at once

  • A warm patch on a basement floor, which points to a hot water line

“The crew was able to find the source of the leak in a short period of time in my opinion. There is a crack in the bottom of the tub.”

Bob B., Google review, November 2025

Water Leak or Gas Leak? What to Do First

A suspected gas leak and a water leak call for opposite actions. With gas, you leave the building and call the utility, and no plumber should be your first call. With water, you stay and shut the main, because every minute of flow is more damage. Boisvert handles the repair side of both.

Hartford, West Hartford, Bloomfield, Avon, Simsbury, and Farmington are all Connecticut Natural Gas territory. CNG’s gas emergency line is 866-924-5325 and it is staffed around the clock. Parts of Windsor are served by Yankee Gas, operating as Eversource, whose gas emergency number is 877-944-5325. If you are not sure which one covers your street, call 911 from outside and let them route it.

Here is the order of operations for each.

If You Suspect a Water Leak

Your first job is to stop the water. Everything after that is easier with the flow shut off.

Do this first:

  • Shut the main valve, usually where the service line enters the basement

  • Shut the valve at the fixture or appliance if you can see where the water is coming from

  • Move anything off the floor that water can ruin, and pull up soaked rugs

  • Take photos before you clean up, in case you end up filing an insurance claim

  • Call us, and tell us where you saw water and what the meter is doing

If you are filing a claim, ask us for the findings in writing. Adjusters want to know what failed and when, and we can put that on paper for you.

If You Smell Gas

Do not troubleshoot a gas smell. Natural gas is odorized specifically so that you will leave, and leaving is the correct response.

Do this first:

  • Get everyone out of the building, including pets

  • Leave doors open behind you rather than closing them

  • Do not flip switches, unplug anything, or use a phone inside the building

  • Do not start a vehicle in an attached garage

  • From outside and well away from the building, call Connecticut Natural Gas at 866-924-5325, or call 911

The utility’s job is to make the situation safe and shut the gas off at the meter. Ours starts after that, repairing or replacing the gas piping inside the house so you can be turned back on. Call us once the utility has cleared the property.

How Can We Help?

Our Services

We provide homeowners and business owners in Central Connecticut and the Greater Hartford Area with expert plumbing, HVAC, water heaters, boilers, sewer solutions and more. From system upgrades to energy-efficient solutions, we deliver reliable comfort and trustworthy results. Reach us 24/7!

Preferred HVAC & Plumbing Service Provider

Why Choose Boisvert

  • Skilled Technicians Highly trained & qualified technicians. CT licenses: PLM.0282249-P1, HTG.0405214-S1, ELC.0204306-E1.
  • 24/7/365 Service Expert service when you need it the most.
  • Quality Work We always stand by the quality of our work.
  • Exceptional Warranties Parts & labor on new installations.
  • Special Offers We offer our customers opportunities to save.

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