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Complete Leak Detection Services in the Princeton, NJ Area

A leak you can’t see is often worse than one you can.

The jobs our plumbers run look different from each other. An unexplained damp spot on a Summit basement floor is one. A New Providence water meter spinning with every fixture off is another. Mold on a Berkeley Heights wall with no visible water source is a third. Our plumbers narrow each of these down to a specific location in a specific pipe, then interpret what the readings actually mean before any wall or slab gets opened.

Years in Business

Skilled employees

Emergency Service

Trucks on the Road


After-Hours Detection When a Leak Can’t Wait Until Morning

A leak that’s actively spreading water through your home can’t wait for normal business hours.

Every hour an active leak runs, more drywall softens, more subfloor swells, and more insulation gets saturated. That’s why our response doesn’t wait for business hours. Our licensed plumbers serve Hamilton Township, Princeton, Hillsborough Township, and the surrounding communities, and after-hours trucks carry acoustic listening equipment and thermal imaging so the search can start the moment they arrive.

Sudden intrusion in a finished space, a slab that’s warming up, or a sound of water you can’t explain. All of them deserve a response that starts tonight.

4.7
Based on 6684 reviews
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(609) 799-3434

Our Process for Leak Detection Services

Leak detection is diagnostic work, and the value is in finding the actual leak, not just somewhere water happens to appear.

Every leak detection visit follows the same deliberate process, so the repair that follows addresses the right thing.

Our licensed plumber starts by understanding what you’re seeing, hearing, or noticing. Whether you’re in an older Maplewood home where slab leaks are common or a newer Monroe Township property where supply line issues may be the culprit, the symptoms often point to the type of leak and where to start looking.

Different leak types require different detection methods. We use acoustic listening devices for pressurized lines, thermal imaging for hot water leaks and slab leaks, moisture meters to verify affected areas, and video pipe inspection when appropriate. The equipment tells us where the leak is; our experience tells us what we’re looking at.

Once the leak is located, we walk you through what we found, explain the scope of the repair, and give you straightforward pricing. You’ll know exactly where the leak is and what it will take to fix before any repair work starts.

What Our Customers Are Saying

100% Satisfaction Guarantee

4.7
Based on 6683 reviews
I was very happy with Norman, I found him very accomidating, skilled and professional .
Joe was excellent! He came right on time and completed the job in a professional and competent manner. Will definitely have him come out for other projects! Steve came out to repair some plumbing issues. He was excellent. He explained what needed to be done and scheduled the work immediately. I would highly recommend Weltman Home Services. Ryan did a great job. I haven't had anything but excellent service from Weltman. Herb and Christian installed my new HVAC system. They were great! Very pleased with the entire Weltman team. Another 5 star job! Thank you! Henry installed a new attic fan. He did a great job! Michal and Eric came diagnosed and fixed the issue. Great service as always! Eric arrived right on time and completed all of the necessary work. Excellent work! Had outside water source replaced today (11-30-23) and Brent did a great job! I always rely on Weltman! Steve came out and cleaned my dryer vent. He was quick yet thorough. The cleaning was long overdue and my dryers effectiveness has been improved. Great service as always! Routine maintenance on the HVAC system by Michael and Andre. Excellent service as usual. New service on October 6, 2026. Joe and Stephon did a great job. My new light fixture looks great. They're always reliable and the service is excellent. Would strongly recommend!
Benjamin
2 days ago
Great service. Easy to schedule an appointment and the technicians are knowledgeable, punctual, and friendly. At our last system maintenance appointment, I pointed out a problem we were having to the technician, Stivan, and he immediately fixed it. He also identified some other issues and clearly explained/documented what the problem was and what needed to be done. Highly recommended! Update 10/2/26: I've used Princeton Air for many years for HVAC maintenance, but today was the first time I've used them to install a new system (heating and AC). The service was fantastic. Asterson and team arrived promptly and, once I'd shown them where everything was, they completed the installation without any further interruptions to my day. Just as they were packing up and getting ready to leave, Asterson even took the time to fix and completely unrelated problem I was having with one of my air vents. Very happy with my new HVAC system.
Stephen Foster
3 days ago
Excellent service and information from Norman on completion of Boiler maintenance.Very helpful and comprehensive review of equipment .Great work. Thank you. We have an annual contract for HVAC..systems
Flavio Costa
3 days ago
Great experience with Norman from Princeton Air. He took the time to explain everything clearly, walked me through what needed to be done, and gave me helpful advice on how to better take care of my system going forward. Great customer service. Highly recommend!
Morris Bender
5 days ago
Technician did thorough job tuning up furnace for the winter. Very polite as usual
A-1!!! Compared to other HVAC companies, Dominic provided a full explanation of problems with steam boiler, along with photographs- appreciate the “education” and recommendations.
Lisa M Apgar
1 week ago
Ryan was wonderful. Very helpful and knowledgablel
Deborah Johnson
1 week ago
Ryan was a delight to have in my home. He was respectful of my space, easy to talk with and very knowledgeable. He thorough and took the time share information about the maintenance done on my furnace.
Lee Christensen
1 week ago
Showed up in a timely manner and a text was sent saying the tech was on the way along with pic of tech. Very thorough annual tuneup and tech was very helpful in explaining the condition of my old furnace giving me peace of mind.
Bill Kocis
1 week ago
Professional in every way. Courteous. Quickly fixed the problem.
Jason Muniz was terrific in pointing out a potential problem for us. His explanation was clear and he was not alarming. Jason was on time and courteous, the kind of professional who we like to have take care of our home,
Lynn Roth
1 week ago
Sink was leaking after 1st plumbers fix. To many short cuts. Error was corrected and the sink is no longer leaking. Lynn
Bebu57
2 weeks ago
Rapid make appointment for customer . Come quickly to estimate and repair.
Linda Kotchkoski
2 weeks ago
Norman S Was very efficient and pleasant . He did a great job
Linda Knights
2 weeks ago
Johnny was excellent at carrying out my air conditioning inspection (in September -/ first available?!?!) and he carefully explained everything he looked at and carried out. He also found my non-functioning dehumidifier was simply unplugged! Nice friendly courteous guy.
Dan Valentine
2 weeks ago
Very friendly and thorough service
Darrayl Cummings
2 weeks ago
So knowledgeable and personable
Douglas Schoch
2 weeks ago
Prompt and courteous technician.
DK
2 weeks ago
Johnny, the rep from your company provided an excellent service appt . He was through and fully explained everything to us after he was done and showed us photos of various parts of the heating unit. He was also very friendly
Vishesh Tandon
2 weeks ago
Great service . Dan went over all the system details .
cyclingthings
2 weeks ago
Wilver did an excellent job diagnosing what the problem was! Thanks. Patricia
Lucille Albanese
3 weeks ago
Mike was very professional and knowledgeable. He explained reason for repairs. He left everything clean after his work. I would be happy to recommend and use his service for future needs. Also Princeton Air responded very quickly to my call and arrived within the time frame they said that they would. I’m not sure what the going rates are for this type of repair so the cost charged may be within reason. However, it seemed high priced.
GRACE CHO
3 weeks ago
Thermostat wasn’t working Dominic from Princeton air explained very well and fixed right away. It was very educational. Thanks Dominic
I engaged Princeton Air for my Furnace maintenance. Danielle, the Technician was fabulous. Very patiently he explained to me in details the exact state of the furnace. No hard sell, just simple facts. I knew that am in good hands as he went on performing maintenance and clearly showed me what he was doing and why. I never experienced such a knowledgeable technician. He also gave me some tips to keep my HVAC system efficient. I highly recommend Princeton Air and specifically Danielle to any homeowner who wants peace of mind in running HVAC system efficiently

Types of Leaks We Detect

Leaks take many forms, and knowing what type of leak you’re dealing with changes both the detection method and the repair.

Princeton Air’s licensed plumbers locate every category of residential water leak across Mercer County, Middlesex County, and Somerset County, including the ones that don’t show up as visible water.

Pressurized water lines running through walls can develop leaks at joints, connections, or along pipe runs. These leaks often show up as damp drywall, warped flooring, or staining on ceilings below. Acoustic listening equipment locates the exact failure point without opening the wall.

Water lines running through or under a concrete slab can develop leaks that warm the floor, raise water bills, and eventually surface through the slab itself. Thermal imaging and acoustic detection locate slab leaks precisely, so the repair minimizes the slab work required.

The main water line from the street to your home can develop leaks underground, showing up as soft ground, unusually lush grass in specific spots, or unexplained water bill increases. Pressure testing and acoustic detection locate the leak without digging up the entire line.

Unlike supply line leaks, sewer line failures involve wastewater escaping from a non-pressurized line. Video pipe inspection locates cracks, offsets, and breaks in sewer laterals, giving you a clear picture of what needs to be repaired.

Some leaks originate at fixtures, water heaters, or appliances and then travel through walls and floors before showing up. Our plumbers trace water back to its actual source so the repair addresses the leak, not just where the water ends up.

(609) 799-3434

Why Professional Leak Detection Matters

Finding a leak yourself is sometimes possible, but finding it precisely, early, and without destroying your home in the process takes professional equipment and experience.

Across older homes in Trenton, Montclair, and South Orange, hidden leaks often run for months before visible damage appears. The reasons professional leak detection is worth the investment are grounded in what happens when leaks are mislocated or found too late.

The wrong leak location leads to the wrong wall being opened, the wrong floor being cut, or the wrong section of yard being dug up. Professional detection locates the leak precisely, so the repair affects only what actually needs repair.

A small leak inside a wall can run for weeks before visible damage appears, by which point mold, structural damage, and rotted framing may be involved. Early detection limits the damage to the leak itself rather than everything it’s affected.

When your water bill jumps without an obvious reason, a hidden leak is usually the cause. Leak detection identifies the source and quantifies the impact, so you stop paying for water that’s damaging your home.

Water finds the path of least resistance, which usually means traveling along joists, through subfloors, and down through ceilings. Precise leak detection stops the damage before it spreads to the structural elements of your home.

Insurance carriers typically require documented professional leak detection before approving water damage claims. Our service provides the documentation you need, and we can work with your insurance process when applicable.


Princeton Air Technician

(609) 799-3434

Signs You Need Leak Detection

Most homeowners who call us already know something isn’t right. The question is what it is and where.

If you’re seeing any of these signs in your home in Westfield, Summit, Warren, or the surrounding area, professional leak detection is usually the right next step.

An unexplained jump in water usage, especially one that keeps climbing month over month, almost always means a hidden leak. If you haven’t changed your water use patterns, something is using water you can’t see.

The sound of water running through pipes when every fixture is off points to a leak somewhere in the system. This is one of the clearest indicators that professional detection is worth scheduling right away.

A warm spot on a concrete slab or a wall that feels unusually warm to the touch often indicates a hot water line leaking behind or below the surface. Thermal imaging confirms and locates these leaks precisely.

Damp drywall, mold growth in unexpected places, or persistent musty smells in an area of your home usually point to a hidden leak feeding moisture into the space. The sooner it’s located, the less damage spreads.

A main water line leaking underground can create damp ground, sinkholes, or patches of grass that are noticeably greener than the surrounding lawn. These signs warrant professional detection before the line fails completely.


Other Plumbing Services

Leak detection is the diagnostic step, and the repair that follows often involves related plumbing work.

Once the leak is located, the repair that follows stays with the same licensed team that found it, whether the fix is a simple pipe repair or part of a larger plumbing project.

Once the leak is located, our licensed plumbers handle the repair with the precision your home’s plumbing system requires. The diagnostic work and the repair are often completed in the same visit when the situation allows.

When leak detection reveals that one section of your plumbing is failing or an entire material has reached end of life, targeted pipe retrofitting or whole-home repiping is often the right long-term solution.

Main water line leaks require specialized repair, often involving trenchless replacement or targeted excavation. Our plumbers handle main line work as a companion service to the detection.

When sewer line inspection reveals damage that can be addressed without excavation, trenchless pipe lining restores the line from the inside out. We handle trenchless work as part of an integrated sewer solution.

When a leak requires urgent response, our 24/7 emergency service dispatches licensed plumbers with detection and repair equipment, so the situation gets contained and addressed in a single visit.

(609) 799-3434


(609) 799-3434

Why Homeowners Trust Princeton Air for Leak Detection

An active leak gets worse every hour it runs, which is why our after-hours response is available seven days a week. Call anytime and you’ll reach a licensed plumber ready to start the search.

Leak detection is interpretive work. The equipment tells you where to look, but experience tells you what you’re looking at. Our licensed plumbers handle leak detection regularly, and that regular practice shows up in the accuracy of every diagnosis.

We bring the acoustic listening devices, thermal imaging cameras, moisture meters, and video inspection equipment that professional leak detection requires. Every tool is matched to the type of leak we’re diagnosing.

Leak detection is interpretive work. The right call comes from seeing enough homes, enough pipe materials, and enough failure patterns to know what the equipment readings actually mean. Princeton Air has spent more than 50 years building that knowledge.

Once we find the leak, we tell you exactly what the repair involves and what it will cost. You won’t be sold a larger scope than the situation requires.

Leak detection only works if the location we give you is actually correct. Every job is backed by our full satisfaction guarantee, and if the location turns out to be wrong, we come back at no additional charge.


Schedule Leak Detection Service With Princeton Air Today

A hidden leak doesn’t get better on its own, and the longer it goes undetected, the more damage it causes to the home around it.

The symptoms are usually unmistakable: an unexplained bill jump, a warm spot, the sound of water running when nothing’s on.

What’s harder is locating the leak precisely, without tearing the place apart to find it. That’s what our licensed plumbers do, with acoustic listening, thermal imaging, and video inspection.

Contact Princeton Air today to schedule leak detection service in New Jersey.

Princeton Air Technician


Leak Detection FAQs

How do you find a leak without tearing up my house?

Professional leak detection uses equipment that locates leaks non-invasively: acoustic listening devices that hear the specific sound water makes when escaping a pressurized pipe, thermal imaging cameras that detect temperature differences from hot water leaks, moisture meters that map the extent of affected materials, and video pipe inspection for sewer lines. The goal is to narrow the leak location to within inches, so the repair affects only what has to be opened.

How long does leak detection take?

Most residential leak detection visits take between one and three hours, depending on the type of leak and how accessible the affected area is. Slab leaks and outdoor main line leaks often take longer than leaks in accessible walls. Our plumbers give you a realistic timeline when we arrive.

Can you detect a leak if I don’t know where it’s coming from?

Yes. That’s exactly what professional leak detection is for. Most homeowners who call us know something is wrong but can’t pinpoint the source. Our job is to start with the symptoms and use the right equipment to locate the leak precisely.

Will insurance cover leak detection and repair?

Most homeowner’s insurance policies cover sudden, accidental water damage, which often includes the detection and repair work required to address the leak. Coverage for gradual leaks and long-term damage varies by policy. We can provide documentation for your insurance claim, but coverage decisions are up to your carrier.

Do you offer emergency leak detection service?

Yes. When a leak requires immediate response, Princeton Air provides 24/7 emergency service throughout the area. Our licensed plumbers arrive with detection equipment and the ability to perform most repairs on the spot.

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