Expert Plumbing Solutions Backed
by Over 33 Years of Experience
Why Long Island Homeowners Trust NJM for Water Treatment & Filtration
Expert installation, clean workmanship, and solutions designed for Long Island’s unique water quality.
Your water treatment system is installed by certified professionals who follow all plumbing and safety codes.
We test and evaluate your water to determine the right filtration or purification setup for your needs.
We install proven brands and reliable components built to last and improve water quality long-term.
We protect your home, ensure proper plumbing hookups, and leave your mechanical areas neat and organized.
No upselling or hidden fees — just honest recommendations that match your water needs.
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.
Cleaner, Safer Water Starts With the Right Treatment System, and Our Experts Make the Installation Simple and Reliable.
Long Island water often contains minerals, sediment, contaminants, and buildup that affect taste, appliance lifespan, and overall home safety. At NJM Mechanical & Contracting, we deliver professional water treatment and filtration installations designed to improve water quality for homes and businesses across Long Island, Nassau County, and Suffolk County.
Whether you need whole-home filtration, point-of-use systems, or specialized treatment for hard water, our licensed technicians ensure proper installation and lasting performance.
We install high-quality filtration systems designed to remove sediment, chlorine, odors, minerals, and common Long Island contaminants. Whether you need whole-home filtration, activated carbon systems, or advanced reverse osmosis for drinking water, our team ensures clean, better-tasting water with safe, code-compliant installation.
Our purification systems target bacteria, microorganisms, and hard-water minerals that affect plumbing, appliances, and household health. UV disinfection, softening systems, and specialized treatments help protect your water supply and extend the life of your fixtures and equipment.
System Replacement & Maintenance:
Repairs, Replacements, Upgrades & Routine Service
We service all major filtration and treatment systems with professional repairs, updates, and full system replacements. Whether your current unit is failing, outdated, or not meeting your water demands, we provide reliable maintenance and upgrades to keep your water clean and consistent.