Our Team Handles All Types Of Plumbing Leaks, Using Modern Diagnostic Tools To Pinpoint Issues Without Unnecessary Damage To Your Home.
Water leaks can cause serious damage if left untreated. At NJM Mechanical & Contracting, we provide professional leak detection and repair services designed to quickly locate the source of the problem and prevent further issues.
Whether you’re dealing with hidden pipe leaks, slab leaks, fixture leaks, or sudden water damage, our licensed team uses advanced tools to diagnose and fix the issue with precision.
We locate leaks behind walls, ceilings, and floors using acoustic listening devices, thermal imaging, and moisture mapping. This allows us to pinpoint the source without tearing apart your home unnecessarily.
Underground or under-concrete leaks can cause structural damage and rising utility bills. Our technicians detect pressure drops and use specialized equipment to isolate and repair leaks beneath slabs and foundations.
We diagnose and repair leaking faucets, toilets, shower valves, supply lines, and appliance hookups. From slow drips to major fixture failures, we restore proper function and prevent water damage.
Leaks at the tank, fittings, or internal components can lead to severe flooding. We identify the exact failure point and provide same-day repairs or replacements for both tank and tankless systems.
Our team handles underground water supply line leaks caused by corrosion, shifting soil, or pipe deterioration. We use non-invasive detection tools to locate leaks and perform trenchless repairs whenever possible.
We detect leaks in drain pipes and sewer lines that may cause odors, backups, or soil saturation. Camera inspections allow us to see inside your lines and determine whether repairs or replacements are required.
If you notice stains, bubbling paint, mold growth, or warping, we trace the leak back to its origin — whether it’s a broken pipe, leaking fitting, or appliance overflow.
Burst pipes, active flooding, or sudden pressure loss require immediate attention. Our technicians provide rapid-response leak repair 24/7 to stop the damage and protect your home.
Expert Plumbing Solutions Backed
by Over 33 Years of Experience
Why Long Island Homeowners Trust Us for Leak Detection & Repair
With decades of experience and multiple Master Plumber licenses, NJM delivers safe, compliant, and reliable gas line and plumbing work across Long Island.
We use state-of-the-art equipment to locate leaks quickly and accurately — even in hidden or hard-to-reach areas.
Every repair is handled by trained professionals who follow Long Island plumbing codes and safety standards.
Most leaks are found and fixed on the same visit, preventing further property damage.
We use non-invasive methods whenever possible to avoid unnecessary demolition.
No surprises. We provide clear estimates before any work begins.
Serving homeowners across Nassau and Suffolk County with reliable, high-quality plumbing solutions.
Water Heater & Boiler Safety Testing
Assessment of temperature controls, pressure relief valves, gas/water connections, and venting to prevent hazards and improve efficiency.
Fixture & Appliance Safety Checks
Inspection of water heaters, boilers, valves, shut-offs, and plumbing fixtures to ensure proper operation and safe performance.
Leak Detection & Line Evaluation
We use advanced diagnostic tools to locate leaks, pressure issues, corrosion, and worn components before they evolve into major problems.
Emergency Shut-Off Valve Testing
Ensuring all plumbing shut-off valves function properly in the event of leaks or system failures.
Drain, Vent & Pipe System Assessment
A full review of your home’s plumbing infrastructure — drains, vents, supply lines, and connections — to ensure proper flow and system health.
Code Compliance Review
We verify that your plumbing system meets all Long Island, Nassau, and Suffolk County regulations — essential for renovations, additions, or property sales.
Trusted Plumbing Expertise for Long Island Homes & Businesses
Our Plumbing Safety & Inspection Services Include:
NJM provides advanced inspection, leak detection, and safety evaluations to keep your plumbing system running efficiently, safely, and fully compliant with local codes.
Find HVAC Services Near You!
Service Area Links:
- Long Island
- Nassau County
- Suffolk County
What Our Long Island Clients Are Saying...
Kris
I couldn’t recommend Neil enough! From start to finish him and his team were professional, efficient and experienced. We had a job pulling up rocks and putting top soil down which I know can be a tedious job. We appreciate the work and look
Evelyn Powers
We had an ongoing issue with clogs. My daughter woke up to flooding in her bedroom from her toilet, which was not fun! This was our first time having NJM in our home. Neil was knowledgeable and gave us several options. we chose to have him use the camera to get to the root of the problem. He was able to pinpoint several issues and was able to fix clog and clean out the pipes. Neil and his crew were very professional,
Irene Cheung
I contacted NJM Mechanical because I didn’t have hot water anywhere in my house. Neil was able to diagnose the issue and get to work. My navien tankless water heater is only a year old and still under warranty. Instead of waiting on Navien to send the part so the issue can be corrected, Neil went out, found the part, purchased it,
William Lo
Great experience. Neil came out and took the time to explain everything thoroughly. He was able to fix all the errors on our Navien and have it back up and running. Following up a week later. Neil and Mike came out to redo the Navien system for proper instillation.
Unfortunatley, after there was a gas leak with our Navien system. Neil was able to get
James Farnworth
Neil from NJM was able to get my ac system up and running when others could not. He was honest with me right from the beginning and all costs were discussed before repairs began. Additionally, Neil spent time explaining to me how my system operates and the things I could do to help it run at peak performance. It was quite refreshing to experience a service technician who demonstrated the uppermost
Raul Chardon
Honest professional full of knowledge not BS. Takes pride in his craft and is a master of it.