Plumber in Islip, NYEmergency Plumbing, Drains, Backwater Valves & Water Heaters

Nicoll's estate, Main Street and Bayberry Point.

Wikipedia says William Nicoll became a patentee of the east end of what is now the Town of Islip in the 1680s and named his estate after his family's home of Islip in England; the local post office took the name in 1802. The hamlet went from farms to an enclave of wealthy families in the 19th and 20th centuries, and while many of the old mansions are gone, some remain alongside a good number of Queen Anne Revival houses. Main Street (NY 27A) is the shopping district. At Bayberry Point, three streets separated by canals on the Great South Bay, Horace Havemeyer had Moorish-style houses built in an early cooperative designed by Grosvenor Atterbury and finished in 1916. The hamlet covers 4.9 square miles on the north side of the Great South Bay, across from Fire Island, with the town's public bathing beach and the Seatuck National Wildlife Refuge at its southeastern corner. Children go to Islip School District schools, and Islip has had rail service since 1868; its LIRR station is on the Montauk Branch.

The Census Bureau's latest five-year survey counts about 6,400 homes, with a median year built of 1966. 16% were built before 1940, 15% in the 1950s, 27% in the 1960s and 15% in the 1970s; 23% went up after 1980. 73% are single-family detached houses, 8% are attached townhouses and 12% are in buildings of five or more units; 85% are owner-occupied.

That spread matters. The pre-1940 houses can still have galvanized supply pipe and cast-iron drains, while the 1960s houses have water heaters, fixture valves and main lines at the age where they start to fail.

A third still heat with oil.

The ACS shows 53% of Islip homes heat with utility gas and 35% with fuel oil. Every oil-to-gas switch needs 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.

Mostly sewered, not everywhere.

Laying Suffolk County's sewer-district map over the Census boundary, about 83% of the hamlet's area is inside Suffolk County Sewer District No. 3 (Southwest). The parts outside it are at the far south end along the bay and at the northern end. To check your house, look for a sewer district charge on your tax bill or ask Suffolk County DPW. If you're on the sewer, a backup that stops at your house is usually in your own line to the street; we clear it. If you're on a cesspool or septic system, we clear the house drain; a full or failing cesspool is a job for a cesspool or septic contractor (we don't do cesspool work).

Flood risk along the bay.

Laying FEMA's current flood map over the Census boundary, about 11.5% of the Islip CDP is in the high-risk (1% annual chance) flood zone, 9.4% in zone AE and 2.1% in the wave-action zone VE, plus about 8% open water. About 94% of that high-risk area lies south of Main Street (Montauk Highway), and none of it north of Sunrise Highway. For a sewered house in or near that zone, a backwater (sewer check) valve on the house sewer line can keep a street-sewer backup from coming in through basement floor drains. We install them. If your water heater or gas appliances ever sat in salt water, have them checked before relighting.

Water: Suffolk County Water Authority, Area 1.

EPA's service-area map puts essentially all of Islip on SCWA, and SCWA's index lists "Islip, Islip Terrace" in its Distribution Area 1. SCWA's 2026 report on 2025 water shows Area 1 iron averaging 218 micrograms per liter and reaching 963, against New York's 300 standard for taste, odor and staining; SCWA adds phosphate to keep iron in solution. Hardness averaged 36.5 mg/L (soft) and nitrate 0.79 mg/L, 1,4-dioxane averaged 0.09 micrograms per liter with a high of 0.80 (limit 1.0), and PFOS reached 11 parts per trillion at its highest; New York judges its 10 limit on a running average, and the report shows no violation. SCWA's state-filed inventory counts 11 lead service lines and about 4,200 customer-side galvanized lines across its whole system of nearly 400,000, and SCWA has an address lookup for your line's material on its website. Orange or brown stains in sinks and on laundry usually mean iron, and an iron filter sized to these numbers can help. For a leak at the street, call SCWA at (631) 698-9500.

Permits and licensing: Town of Islip.

Islip is an unincorporated hamlet, so plumbing permits come from the Town of Islip Building Division. Islip's plumbing code says only plumbers licensed by the Islip Town Plumbers' Examining Board may do plumbing or run a plumbing business in the town, and work vans must show the license number. A December 2025 amendment requires a company to have an Islip-licensed master plumber with a controlling interest or as its responsible managing officer.