Plumber in Syosset, NYEmergency Plumbing, Drains, Gas Lines & Water Heaters

Matinecock land, Locust Grove, and the LIRR.

Wikipedia says the Syosset area was home to the Matinecock before Dutch and English colonists arrived in the 1600s. The hamlet covers 5.0 square miles, all land, and took in the former hamlet of Locust Grove for the 1990 census. It borders Oyster Bay and Laurel Hollow to the north, Woodbury to the east, Plainview and Hicksville to the south, and Jericho and Muttontown to the west, with the Syosset LIRR station, the Long Island Expressway and the Northern State Parkway running through. Syosset Hospital opened on Jericho Turnpike in 1962. Children go to Syosset Central School District schools, except in a small northwestern tip that is in the Oyster Bay-East Norwich district.

The Census Bureau's latest five-year survey counts about 6,200 homes, with a median year built of 1958. 55% went up in the 1950s alone and another 15% in the 1960s; only 15% were built after 1980. 92% are single-family detached houses, and 92% are owner-occupied.

So most houses here have drain and water lines about 65 to 75 years old, unless they've been replaced. Slow drains all over the house, a gurgle from the basement floor drain, or a water heater well past its age are the usual signs it's time to have the main line and the supply piping checked.

Four in ten still heat with oil.

The ACS shows 49% of Syosset homes heat with utility gas and 40% with fuel oil. Switching from oil to gas means a new gas line to the heating equipment, and it's a good time to move the water heater, range and dryer to gas too. We do the gas line work. We don't sell or deliver oil.

On the county sewer.

Nassau County's health department lists Syosset as publicly sewered, with the Nassau County Department of Public Works as the sewer authority (516-571-6841). Some neighbors to the north, including Muttontown, Laurel Hollow and East Norwich, are listed as not publicly sewered, so if you're near the edge and not sure, check your Nassau County tax bill for a sewer charge. A backup that stops at your house is usually in your own line to the street; we clear it. If the street is backed up, call the county. FEMA's flood map puts none of the hamlet in the high-risk flood zone.

Water: Jericho Water District.

EPA's service-area map puts about 98% of Syosset residents on the Jericho Water District, whose office is on Convent Road in Syosset, and about 2% at the southeastern edge on the Plainview Water District. Jericho's 2025 report (May 2026) says it serves about 58,000 people through 20,033 services from 25 wells, five of them in Syosset; 24 draw from the Magothy aquifer and one from the Lloyd. Its water is soft (total hardness 5.9 to 55.4 mg/L) and low in iron (no more than 45 micrograms per liter), and the report lists pH readings from 5.3 to 7.1 against the county health department's 7.5 to 8.5 guideline. Nitrate reached 6.4 mg/L, more than half the 10 mg/L limit, so the report carries the state's nitrate advisory for infants. 1,4-dioxane was no more than 0.78 micrograms per liter (limit 1.0); the district has been adding Advanced Oxidation treatment for it, with plants at Wells 20 and 21 running and Well 22 due for the 2026 season, and PFOA no more than 3.14 (limit 10). In 2025 lead tests, the 90th percentile of 120 homes was 1.7 parts per billion, well under the action level. The district's state-filed inventory counts 2 lead service lines out of 19,246, and its spring 2026 newsletter says a contract awarded in December 2025 will replace all of its lead service lines, including goosenecks, with work to be done by spring 2027. Low-mineral water can be hard on old copper and galvanized pipe, so a pinhole leak or blue-green staining is worth a look. For a leak at the curb or meter, call the district at (516) 921-8280.

Permits and licensing: Town of Oyster Bay.

Syosset is an unincorporated hamlet, so permits go through the Town of Oyster Bay Department of Planning and Development. Town code makes it unlawful to install, repair, alter or modify plumbing in the town, or to run a plumbing business, without a master plumber's license issued or recognized by the town, and licensees must carry at least $1 million in liability insurance. The town's Plumbers' Examining Board (516-624-6217) says residents can call to check whether a plumber is licensed.