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Thermal imaging, acoustic listening, and pressure testing under one roof
Leak Detection Inspections Nashua NH That Find Hidden Leaks Fast
Leak Detection Inspections Nashua NH is the fastest way to stop a hidden leak before it rots framing, warps floors, or spikes your water bill. We run home leak inspection Nashua calls for slab leaks, water line leaks, gas line leaks, and roof leaks across Hillsborough County. Same-day slots, 24/7 emergency response, and a written report before we leave.
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Clear scope before work
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Prepared, clean crews
Equipped vehicles and respectful cleanup.
Local accountability
Neighbors serving neighbors with follow-through.
What is included
What Our Leak Detection Inspection Includes
Every inspection is a full diagnostic, not a quick look. Here is what is covered in the flat rate. Repairs are quoted separately, and we will always tell you if a fix can wait.
Full Pressure Test
We isolate the supply system and hold it under pressure with calibrated gauges. A drop tells us there is a leak on the pressurized side. A hold tells us to look at drains, sewer, or the roof. It takes about 20 minutes and sets the direction for the whole visit.
Thermal Imaging Sweep
A FLIR camera reads surface temperature across every wall, floor, and ceiling. Wet material runs 5 to 12 degrees cooler than dry, so a hidden pipe leak shows up as a cold streak. We photograph every hit and mark it with tape.
Acoustic Listening Survey
Acoustic listening devices amplify the sound of water escaping a pressurized pipe. We listen at walls, floors, and the meter. It is the same method utilities use on city mains and it finds leaks that thermal imaging alone can miss.
Moisture Meter Readings
We take moisture meter readings at every suspect spot and log the percentage. You get a baseline number, so you can tell whether a wall is drying out or getting wetter after a repair. It also tells us whether the subfloor is still sound.
Camera Inspection
For underground water line leaks and sewer line leaks, we run a General Pipe Cleaners camera down the line and watch the monitor with you. You see the crack, the root, or the offset joint with your own eyes before you approve any repair.
Written Report And Quote
Before we leave, you get a written report with leak location, pipe material, moisture readings, photos, and a flat-rate repair quote. It is yours to keep, and it stands on its own if you want a second opinion.
PLAN
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Service overview
Leak Detection Inspections Nashua NH: What We Actually Do
Leak Detection Inspections Nashua NH is a diagnostic service that pinpoints where water, gas, or sewer is escaping a pipe, fixture, or slab before any wall gets opened. We start with a full pressure test on the supply side, then sweep the building with thermal imaging cameras and acoustic listening devices to hear water moving behind drywall or under concrete. Once we have a hit, a pipe inspection camera confirms the exact depth and material so the repair crew cuts once, not three times.
Nashua homes built before 1970 usually still run copper pipe, and that copper has had decades of New Hampshire freeze-thaw cycles working on it. Add PEX retrofits, cast-iron drains in the older French Hill and Tree Streets stock, and you get the mix of hidden pipe leaks we see every week. If you have been searching leak detection inspections near me Nashua NH, that is usually a water heater leak, a slab leak, or an underground water line leak that has already soaked the subfloor.
- Stop Water Bill Bleed — A pinhole leak in a copper pipe can push 30 to 50 gallons a day into your slab. We isolate the loss with pressure testing gauges, show you the meter reading before and after, and hand you a number you can take to the water department for an adjustment.
- Catch Gas Leaks Early — Gas line leaks do not wait for a convenient hour. Our Sewerin and tracer gas detectors read down to a few parts per million, so we can confirm a fitting leak at the water heater or furnace connection and shut it down before it becomes a 2 a.m. call to the fire department.
- Protect Slab And Foundation — Slab leaks in Nashua Highlands and Bicentennial ranches often show up as a warm spot on the floor or a hairline crack that keeps growing. Thermal imaging cameras map the moisture plume under the slab, and we mark the repair zone with epoxy-safe tolerances so the concrete cut stays small.
- One Visit, Real Answers — We do not sell inspections as a lead-in to a repair quote you never asked for. You get a written report with the leak location, pipe material, moisture readings from our meters, and a photo set. Affordable leak detection inspections Nashua pricing starts at $180 and most jobs finish in two to four hours.
- Same-Day And 24/7 — We hold same-day slots open every weekday and run a 24/7 emergency line for burst pipes, gas smells, and water heater leaks. Call before noon and a technician is usually at your door by mid-afternoon. After-hours calls get a 60-minute response window inside Nashua city limits.
- Non-Invasive First — We do not start with a sledgehammer. Acoustic listening devices and thermal imaging cameras find most hidden pipe leaks without cutting drywall. When we do open something, we already know what is behind it, so the hole is the size of a dinner plate instead of a doorway.
- Flat-Rate Pricing — Our leak inspection services Nashua pricing is flat-rate, quoted before we start. A standard home leak inspection Nashua runs $180 to $450 depending on square footage and how many systems we test. No hourly meter, no surprise line items, no charge for the report.
- We Show You The Evidence — Every leak we call gets a photo, a moisture reading, and a mark on the wall or floor. You see the thermal image and the camera footage on our monitor. If we cannot find a leak, you do not pay for a guess. That is how we have kept a 4.9-star average across 16 years.
The service timeline
How Our Leak Inspection Process Works
Phone Triage
You call 603 571 4078 and describe what you are seeing: a wet spot, a spike in the water bill, a hissing sound, a warm floor. We ask four or five questions, tell you whether to shut the main off, and book a same-day or next-morning slot. Emergency calls get a technician rolling within 60 minutes.
Pressure Test
First thing on site, we isolate the supply system and pressurize it with a gauge. If the needle drops, you have a supply-side leak. If it holds, the problem is on the drain, sewer, or roof side. This single test saves an hour of guessing and tells us which tools to pull out of the truck.
Acoustic And Thermal Sweep
We walk the house with acoustic listening devices and a FLIR thermal imaging camera. Water moving through a cracked pipe makes a distinct frequency, and a wet wall reads 5 to 12 degrees cooler than dry drywall. We mark every hit with painter's tape so you can see the evidence yourself.
Camera Confirmation
For underground water line leaks and sewer line leaks, we run a General Pipe Cleaners inspection camera down the line. You watch the monitor with us. We confirm pipe material, crack size, root intrusion, and depth, then write the repair plan around what the camera actually shows.
Report And Repair Plan
Before we pack up, you get a written report: leak location, pipe material, moisture meter readings, photos, and a flat-rate repair quote. If you want us to do the fix, we schedule it. If you want a second opinion, the report stands on its own. No pressure either way.
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Tools And Methods We Use
FLIR Thermal Imaging Cameras
Read surface temperature differences as small as 0.1 degrees to spot wet walls, warm slab leaks, and hidden moisture behind paint without opening anything.
Acoustic Listening Devices
Amplify the sound of pressurized water escaping a pipe. Used on walls, floors, and underground lines to pinpoint leaks that thermal imaging cannot reach.
Sewerin Tracer Gas Detectors
Read tracer gas and natural gas down to parts per million. The go-to tool for gas line leaks and hard-to-find buried line leaks.
General Pipe Cleaners Inspection Cameras
Push down sewer and water lines to show cracks, root intrusion, and offset joints on a monitor. You see the problem with your own eyes.
Pressure Testing Gauges
Isolate the supply system and hold it under pressure. A dropping needle confirms a leak on the pressurized side in about 20 minutes.
Moisture Meters
Log percentage readings at every suspect spot so you have a baseline. Tells us whether a wall is drying or getting wetter after a repair.
RIDGID And Milwaukee Equipment
Locating tools, inspection reels, and pipe wrenches we trust on every job. DeWalt and Bosch gear fills out the rest of the truck.
Pressure Isolation Testing
We close the main, isolate the supply system, and pressurize it with a gauge. If the needle drops, the leak is on the pressurized side. If it holds, we move to drains, sewer, or roof. This single test saves an hour of guessing on every job.
Thermal And Acoustic Cross-Reference
A thermal hit tells us where. An acoustic hit tells us what. When both point to the same spot, we have a confirmed leak. When they disagree, we run a camera or tracer gas before we cut anything.
Tracer Gas Injection
For buried lines and slab leaks that pressure testing cannot isolate, we inject a safe tracer gas into the line and read it at the surface with a Sewerin detector. It finds leaks that acoustics miss, especially under concrete and frozen ground.
Camera Confirmation
Before any repair quote, we run a camera down the line and watch the monitor with you. You see the crack, the root, or the joint. No repair gets quoted without visual proof unless the line is inaccessible, and then we say so.
Where this service helps
When To Book A Leak Inspection
You are buying a house in Nashua and the inspection report flags moisture in the basement.
We run a full leak detection inspection before closing: pressure test, thermal sweep, and moisture meter readings on every wall. You get a written report with photos and a repair estimate you can use in negotiation. Buyers walk into closing knowing whether the moisture is a $200 fix or a $6,000 slab repair, and sellers get a clear path to close.
Your water heater is 12 years old and there is a puddle in the pan.
We inspect the tank seam, T&P valve, anode rod, and all connections. If it is a fitting, we fix it. If the tank is gone, we tell you straight and quote a replacement. You either spend $150 on a fitting or plan a tank swap before it floods the basement on a holiday weekend.
It is February, the ground is frozen, and your water bill spiked 40 percent.
Frozen ground pushes underground water line leaks to the surface as wet patches or low pressure. We use acoustic listening devices and tracer gas to find the break without digging up the whole yard. We mark the trench line, dig one hole, and fix the pipe. Most frozen-ground water line repairs finish in a single day.
You manage a commercial building on Amherst Street and the water bill doubled.
We run after-hours commercial leak detection so your tenants are not disrupted. Pressure testing, thermal imaging, and camera inspection on the sewer and water mains. You get a report with the leak location and a repair plan you can schedule around business hours, not during them.
Local execution
How Leak Detection Runs In Nashua
Nashua sits in Hillsborough County where winter lows hit minus 10 and the ground freezes 36 to 48 inches deep. That freeze-thaw cycle is hard on copper pipe and PEX fittings, and it is why we see a spike in burst-pipe and underground water line leak calls from December through March. The older housing stock in Crown Hill, French Hill, and Tree Streets still runs a mix of copper supply lines and cast-iron drains, while newer builds out by the Nashua Mall Area use PEX and PVC. We match the tool to the material: acoustic gear for copper, pressure testing for PEX, camera inspection for cast iron. If you need leak inspection services Nashua that understand what a New Hampshire winter does to a plumbing system, call 603 571 4078. We also handle the summer side: irrigation system leaks and pool leaks that show up when the ground dries and cracks.
Crown Hill
1890s Victorians with original copper supply lines and cast-iron drains. Slab leaks and hidden pipe leaks are common in the older basements here.
French Hill
Dense multi-family stock where a leak in one unit often shows up in the unit below. We test both sides before quoting a repair.
Nashua Highlands
Post-war ranches on slabs. Warm floors and hairline cracks usually mean a hot-water slab leak under the concrete.
Main Street District
Commercial and mixed-use buildings with high water demand. After-hours inspections keep businesses open while we work.
Exit 8 Neighborhood
Newer construction with PEX and PVC. Leaks here are usually fitting failures, not pipe failures, and pressure testing finds them fast.
Ground freezes 36 to 48 inches deep in winter
Underground water line leaks get pushed to the surface as wet patches or low pressure. We use acoustic listening and tracer gas instead of digging, which keeps the yard intact until we know exactly where the break is.
Older copper pipe in pre-1970 housing stock
Copper thins from the inside and pinholes at joints. Acoustic gear hears the leak before it soaks the drywall. We mark the spot and cut once.
Cast-iron drains in French Hill and Tree Streets
Cast iron cracks and scales over decades. A camera inspection shows the break and tells us whether a spot repair or a full replacement is the right call.
Summer irrigation and pool season
A broken irrigation zone or a pool losing an inch a day wastes hundreds of gallons a week. We pressure-test each zone and use tracer gas on buried lines.
Before and after
What a successful service visit changes.
Slab Leak In A Nashua Highlands Ranch
Before
The homeowner noticed a warm spot in the hallway and a water bill that jumped from $60 to $190 a month. Two other plumbers quoted a full slab break-out without confirming the leak location.
After
We pressure-tested the supply, confirmed a hot-water slab leak with thermal imaging, and marked a 2-foot repair zone. The cut was small, the copper was fixed in one day, and the bill dropped back to $62 the next cycle.
Maintenance: We recommend a pressure test every two years on slab homes and a moisture meter check each fall before the ground freezes.
Gas Line Leak Near A Water Heater
Before
A family in Crown Hill smelled gas near the basement water heater at 9 p.m. They shut the valve and called us. The fitting had been weeping for weeks and the smell was just starting to reach the first floor.
After
Our technician arrived in under an hour, confirmed the leak at the union with a Sewerin tracer gas detector, and repaired the joint with code-correct pipe sealant. We re-tested twice and the reading was zero.
Maintenance: Check the water heater connections and T&P valve every six months, and call us immediately if you smell gas again.
Underground Water Line Leak In February
Before
A homeowner on the South End had low water pressure and a wet patch in the yard in the middle of a February freeze. The water bill had climbed 40 percent in two months.
After
Acoustic listening devices and tracer gas found the break 18 inches down, 12 feet from the foundation. We dug one hole, replaced the failed section of copper, and restored full pressure the same day.
Maintenance: Keep the trench area clear of landscaping and schedule a pressure test each fall before the ground freezes.
Problems we solve
Leak Problems We Solve In Nashua
Most calls start with a symptom, not a diagnosis. Here are the four we hear most, and what is usually behind them.
Water bill jumped with no visible leak
A hidden pipe leak or slab leak can waste 30 to 50 gallons a day. Left alone for a year, that is tens of thousands of gallons and a repair bill that grows with the damage. We pressure-test the supply system first. If it holds, we move to the meter and listen for the loss with acoustic gear. Most of these turn out to be a slab leak or an underground water line leak, and we mark it before anyone cuts concrete.
Warm spot on the floor or a crack that keeps growing
A hot spot under tile usually means a hot-water slab leak. The concrete wicks heat up, and the moisture underneath can rot flooring, warp cabinets, and feed mold within a few months. Thermal imaging cameras map the moisture plume and confirm the leak path. We mark a tight repair zone, cut once, and fix the copper pipe or PEX tubing underneath. Most slab repairs are done in a day.
Gas smell near the water heater or furnace
A gas line leak at a fitting or valve is a safety issue, not a plumbing inconvenience. It needs to be isolated and repaired before anyone spends another night in the house. We use Sewerin tracer gas detectors to read down to parts per million and confirm the exact fitting. We isolate the section, make it safe, and repair the joint with code-correct pipe sealant and plumber's tape. Then we re-test.
Sewer smell or a soggy patch in the yard
Sewer line leaks attract roots, undermine driveways, and can back raw waste into a basement. The longer it runs, the bigger the excavation. A pipe inspection camera goes down the line and shows us the break. We give you footage, depth, and a repair plan. If it is a root intrusion, we clear it. If the pipe is cracked, we quote the replacement with no guesswork.
Proof behind the promise
Licensed, Certified, And Local
Technical expertise
16 Years Finding Leaks In Nashua
Nashua LeakDetectors has been in business since 2010, and we have run leak detection inspections Nashua NH calls through every kind of building this city has: 1890s Crown Hill Victorians, post-war ranches off Amherst Street, and new construction near the Nashua Mall Area. Our technicians hold NH Master Plumber License credentials, Backflow Prevention Certification, and IAPMO Certification, and we keep current on EPA WaterSense standards for fixture and irrigation leaks. We carry RIDGID, Fluke, and Milwaukee gear on every truck so the first visit is the diagnostic visit.
- 16 years in business, founded 2010, serving Hillsborough County and greater Nashua
- NH Master Plumber License and Backflow Prevention Certification on staff
- IAPMO Certification for pipe and fixture inspection standards
- EPA WaterSense training for irrigation, sprinkler, and fixture leak audits
- OSHA Safety Certification for confined-space and trench work on underground lines
Customer stories
What Nashua Customers Say
Dave M.Homeowner, Crown Hill
Our water bill doubled in two months and I could not find anything. Nashua LeakDetectors came out the same afternoon, pressure-tested the house, and found a slab leak under the kitchen with the thermal camera. They marked it, showed me the image, and had it fixed the next morning. Bill is back to normal.
Priya S.Homeowner, French Hill
We smelled gas near the water heater and called at 9 p.m. They walked me through shutting the valve and had a tech here in under an hour. He found the leak at a fitting with a tracer gas detector, fixed it, and tested it twice before he left. Calm, fast, no drama.
Tom R.Property Manager, Main Street District
I manage six buildings downtown and use them for every leak call. They found a sewer line leak under a parking lot with a camera, showed me the footage, and gave me a repair quote the same day. No digging until we knew exactly where the break was. That saved me thousands.
How much does a leak detection inspection cost in Nashua NH?
Most leak detection inspections in Nashua run $180 to $450 in 2026, with slab leaks and underground water line leaks at the top of that range. The price covers pressure testing, thermal and acoustic sweeps, and a written report. If we have to run a camera down a sewer line or cut into a slab, we quote that separately before we start. No hourly billing.
What is included in a leak detection inspection in Nashua?
A full inspection includes a supply-side pressure test, a thermal imaging sweep of every room, acoustic listening on walls and floors, moisture meter readings, and a written report with photos. For underground water line leaks and sewer line leaks, we add pipe inspection camera footage. You get the leak location, pipe material, and a flat-rate repair quote before we leave.
How often should I get a leak detection inspection in Nashua?
Every two years for homes built before 1980, and every three to five years for newer construction. Nashua's freeze-thaw cycles stress copper pipe and PEX fittings hard, so we also recommend an inspection any time your water bill jumps 20 percent or more, or after a winter with a deep freeze. Water heater leaks and slab leaks often start small and stay hidden for months.
Who offers leak detection inspections in Nashua New Hampshire?
Nashua LeakDetectors does, and we have since 2010. We are a licensed plumbing contractor with NH Master Plumber License and Backflow Prevention Certification on staff, serving Hillsborough County and every Nashua ZIP code: 03060, 03061, 03062, 03063, and 03064. Call 603 571 4078 for same-day or 24/7 emergency service.
Frequently asked questions
Frequently Asked Questions
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Ask the local teamRelated services
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Residential Leak Detection
Whole-home leak detection inspections Nashua NH for single-family houses, condos, and duplexes. We test supply lines, drains, water heater parts, and fixtures in one visit so you get a complete picture of your home's plumbing health.
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Commercial Leak Detection
Restaurants, offices, and retail spaces on Main Street District and Amherst Street need leak inspection services Nashua that work around business hours. We run after-close and early-morning inspections so your doors stay open and your water bill stops climbing.
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Slab Leak Detection
Slab leaks show up as warm floors, unexplained bill spikes, or cracks that keep widening. We use thermal imaging cameras and acoustic gear to pinpoint the break under concrete, then mark a small repair zone so the cut stays tight.
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A pool losing an inch a day is not evaporation. We pressure-test pool plumbing, check skimmer and return fittings, and use tracer gas detectors on buried lines. Nashua pool owners get a clear answer before the season gets away.
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Contact Nashua LeakDetectors
Call 603 571 4078 any hour, day or night, and a real person answers. We schedule same-day appointments for most leak calls in Nashua and the surrounding Hillsborough County area, and we confirm your window before we roll a truck.