Much of the north shore is not on a public sewer, and water hardness varies more than twofold between one district and the next. Both change the job — and both are published, so we can answer them properly.
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631-587-0085WE ANSWER EVERY CALLNorth Hempstead licenses its own plumbers through a three-member Examining Board of Plumbers, and § 2-33 of the Town Code requires that all plumbing and drainage work in the Town be performed by or under the supervision of a master plumber holding that Board’s certificate. There is no county licence behind it — Nassau County does not license plumbers at all. NJM holds the Town of North Hempstead licence, alongside Hempstead and Oyster Bay, which is the full set of three Nassau towns.
The Town licence is the right credential for the unincorporated communities: Manhasset, Port Washington, Albertson, Carle Place, Garden City Park, Herricks, New Cassel, Roslyn Heights, Searingtown and Greenvale. It is not a blanket. Around thirty incorporated villages sit inside this town, more than in any other town on Long Island, and a good number of them run their own examining boards. We say below exactly which ones, because the honest version of that is more useful to you than a map with no lines on it.
Two things make mechanical work here genuinely different from the south shore, and both are matters of public record rather than opinion. A great deal of the most expensive housing in the Town is not connected to a public sewer. And the water hardness varies more than twofold between one district and the next — which is the difference between needing a softener and being sold one you do not.
Master PlumberLicensed to pull permits
TASK 86/87Certified for gas work
Navien NSSFactory-trained on tankless22+ years on Long Island · Plumbing, heating, cooling, gas and contracting under one roof
We don’t charge to quote a job. We do charge to find a problem nobody has identified yet. Which one you need — and what it costs — gets agreed on the phone, so nothing about the cost is a surprise on the doorstep.
You get the number on the phone, before anyone is dispatched, and it is what you are charged when the technician arrives. One rate across all four trades — plumbing, heating, cooling and gas.
A licensed, insured technician carrying the certifications the work needs, and the time to find what has actually failed — not a quick look and a guess.
A call-out advertised at almost nothing gets recovered once someone is standing in your basement. Get the number before anyone travels — from us, or from anyone else you call — and hold them to it when they arrive.
A boiler that fails in January is not a purchase anyone planned. Financing is available on the big-ticket work, so a system replacement does not have to come out of savings in one go.
Boiler, furnace and water heater replacement, a full air conditioning system, a whole-house repipe, sewer and water main work, and larger contracting jobs — kitchens, bathrooms, dormers and extensions.
At the estimate, before anything is scheduled. It is worth asking even if you think you will not need it, because knowing it is there changes what you are willing to consider fixing properly.
The price of the job. The quote is the quote whether you finance it or not — and on a straightforward repair it is usually not worth the paperwork. We will tell you which one you are looking at.
These are the things that change how a job is planned, and they are all a matter of public record rather than trade folklore.
Nassau County’s own community list marks Manhasset, Sands Point, Kings Point, Great Neck Estates, Munsey Park, Old Westbury, East Hills, Roslyn Heights, Roslyn Estates, Roslyn Harbor, Greenvale, all three Plandomes and western Flower Hill as not publicly sewered. Price and sewer status are unrelated here, and assuming a connection exists is how a renovation schedule falls apart in week three.
Adding fixtures to a house on a private system is not only a plumbing decision — the system has to be able to take the load. That is worth establishing at the design stage rather than at inspection. We will tell you when a project needs that answered before we price the rest of it.
Under § 2-44 the Town issues gas piping permits only to a registered plumber, requires an air pressure test at six inches of mercury, and requires the inspector’s certification before the gas company will install a meter. On a conversion that inspection is the critical path. It belongs in the schedule from day one, not as a surprise at the end.
This is not a historic footnote. In January 2016 the Village of East Hills announced National Grid installing 60,000 feet of gas main, which would let roughly 1,000 homeowners convert. Whether there is a main on your street is a real question here, and the answer decides whether a conversion is a conversion or a much larger piece of work.
Chapter 21 § 21-15C(1) covers new AND replacement heating, ventilating, air conditioning and plumbing service equipment, requiring it at or above base flood elevation. The exposure up here is the shoreline — Manorhaven, Plandome Manor, Kings Point, Saddle Rock, Great Neck Estates, Roslyn and the Port Washington waterfront. Lowest floor including basement goes to two feet above BFE under § 21-16A(1).
Said plainly because you should hear it from us. NJM holds the Town of North Hempstead licence and no village licence anywhere inside it. In the unincorporated hamlets that is exactly the right credential. In several villages it is not enough on its own, and we would rather tell you that before you book than after.
The spread across this one town is large. The Water Authority of Great Neck North reported total hardness up to 174 mg/L in its 2024 report. Port Washington Water District reported up to 173 mg/L in 2025, and Manhasset-Lakeville up to 155 mg/L. Go inland and the numbers roughly halve: Westbury Water District reported up to 70.0 mg/L, Albertson 74.4 mg/L. Those are the districts’ own published figures, in the units they publish them in.
What that means practically. At the north-shore end of the range you are in genuinely moderately hard water, and the symptoms people describe — scale on fixtures, spotting on glassware, soap that will not lather, an element in the water heater furring up — are consistent with what the district is publishing. At the inland end you are in soft to moderately soft water, and a softener is solving a problem you may not have.
So the honest advice is: read your own district’s report before you buy anything. Every district publishes one annually and they are free. If your number is at the low end and someone is still selling you a softener on the strength of a free in-home water test, the test result and the sales pitch came from the same person. That is not a reason to distrust every water treatment recommendation — it is a reason to check the published figure first, because it costs nothing.
And where treatment genuinely is the answer, we would rather size it to the actual water. Several districts across this town are running advanced oxidation treatment for 1,4-dioxane and granular activated carbon for PFAS at named wells — Manhasset-Lakeville, Port Washington, Great Neck North, Garden City Park, Albertson, with Westbury and Roslyn building or designing. That treatment is at the well, not at your house, and it changes what a whole-house filter is and is not doing for you. It is worth knowing which before you spend money on one.
Much of the north shore is not on a public sewer. We handle the house side — the drain and waste lines running to the system — and are straight about where our work ends and a licensed cesspool contractor’s begins.
Every ZIP in this Town peaks in the 1940s, with pre-war stock the second largest group in most. Supply piping of that age fails quietly for a long time before it fails loudly.
Older north-shore houses often run hot water or steam to radiators rather than forced air. Installation, service, and honest advice on what is worth keeping.
Where there is a gas main on the street, the conversion is a plumbing, gas and mechanical job at once. TASK 86/87 certified for the gas side.
The Town issues gas piping permits to registered plumbers only, and requires an air pressure test with inspector certification before the gas company will set a meter. We handle both.
Ductless suits an older house with no duct chases and plaster walls you would rather not open. Full ducted systems where the house allows it.
Gas, oil and propane, including tankless. Navien NSS certified. Treatment sized to your district’s published water, not to a free in-home test.
One licensed team across the plumbing, gas, mechanical and building work — which in a house with plaster, radiators and no basement is the part that usually decides the schedule.
What it says on the coupon is what comes off the bill. Mention it when you call.
The ones we have verified as running their own licensing are Great Neck, Great Neck Estates, Mineola, Westbury, New Hyde Park, Williston Park, Manorhaven and East Hills. Great Neck is the strictest — its code makes a town or county licence a prerequisite for getting the village licence, not a substitute for it, so holding ours does not get us in on its own. Manorhaven is worth flagging separately because its licence expressly covers heating work as well as plumbing. Russell Gardens and Kings Point point at the Town of North Hempstead licence, which is the one we hold. For anywhere else, call with the address and we will check before quoting rather than assume.
The unincorporated communities, which is a substantial part of the Town: Manhasset, Port Washington, Albertson, Carle Place, Garden City Park, Herricks, New Cassel, Roslyn Heights, Searingtown and Greenvale. Those permits go straight through the Town’s Department of Building, Safety, Inspection and Enforcement on Plandome Road in Manhasset. No village licence sits in between, and the filing is ours to make.
Look up your district’s annual water quality report before you decide — the number is published and it is free. Hardness across this one town runs from about 70 mg/L in Westbury and 74 in Albertson up to 174 in Great Neck North and 173 in Port Washington. At the top of that range the classic symptoms are consistent with the water; at the bottom, a softener may be solving a problem you do not have. No district publishes grains per gallon, so if someone quotes you a gpg figure it is their conversion, not the district’s number. We are happy to look at the report with you and say honestly whether we would fit one.
Confirm it for your address rather than assuming from the neighbourhood, because Nassau County lists a lot of the north shore as not publicly sewered — including Manhasset, Sands Point, Kings Point, Great Neck Estates, Munsey Park, Old Westbury, East Hills, the Roslyns, Greenvale and all three Plandomes. Sewered communities include Albertson, Carle Place, Garden City Park, Herricks, New Cassel, New Hyde Park, North Hills, Searingtown and Westbury, plus the Great Neck and Port Washington pollution control districts. The County can confirm your specific address, and it is worth doing before any project that adds fixtures.
The house side, yes — the drain, waste and vent piping running out to the system, and diagnosing whether a backup is the pipe or the system. The system itself is separately licensed work and we will say so rather than blur it. What we will not do is let a job stall in the gap between the two: if the answer is that you need a cesspool contractor, we will tell you that on the first visit rather than after we have been paid to snake a line that was never the problem.
Ductless is usually the right answer and not a compromise. One outdoor unit runs several indoor heads, each independently controlled, with no ducts to route through plaster walls and no attic work in a house where the attic may not take it. It heats as well as cools, which gives you shoulder-season heating without firing the boiler for the whole house. Where a house does have somewhere sensible to run ducts we will price that too — we install both, so we have no reason to steer you.
No. Nassau County licenses home improvement contractors and a long list of other trades, but not plumbers — the County’s own home improvement application says all subcontractors "except plumbers and electricians" must be licensed with that department. Plumbing licensing in Nassau is entirely municipal, town by town and village by village. So the right question to ask any contractor here is not "are you licensed in Nassau", it is "are you licensed by my town, or my village".
Only where it genuinely makes sense, and we would rather say that than pretend distance does not exist. What brings us to North Hempstead is the work where holding four trades under one roof actually saves you something — an oil-to-gas conversion that is a plumbing, gas and mechanical job at once; a renovation in a house with radiators, plaster and no basement; a property where three things need doing and nobody has put them in an order. For a single dripping tap, someone closer is the better answer and we will say so. Call 631-587-0085 and describe the job.
Based in North Babylon, working across both counties — close enough to get there fast, local enough to know the housing stock and the permit offices.
Proudly serving all of Nassau and Suffolk County, with deep local roots near our North Babylon home base.
Get A Free Estimate5 out of 5 stars
The experience I had with with NJM Mechanical & Contracting was a pleasant one. I had the pleasure of doing business with Neil. The work I had done was a basement entrance to my yard and it came out wonderful. The work performed as well as the communication is 10/10.
5 out of 5 stars
Neil has handled all my A/C needs over the years. He's very communicative and open about service charges. He never steers you wrong
5 out of 5 stars
As always, Neil is a pleasure to have as my plumber. He is so professional and knowledgeable. I wouldn't use anyone else! I highly, highly recommend him.
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