~24%
of the CDP in FEMA's high-risk flood zone
Source: FEMA National Flood Hazard Layer, Atlas overlay (Oct 2026)51%
of homes built in the 1950s
Source: Census ACS 2024 5-yr, B2503433%
of homes heat with fuel oil
Source: Census ACS 2024 5-yr, B250401.6–19.3mg/L
total hardness, Liberty Merrick system (very soft)
Source: Liberty Utilities NY, Merrick 2026 CCR (2025 data)Massapequa east of Massapequa, and West Amityville.
The hamlet takes its name from sitting east of Massapequa and Massapequa Park. Wikipedia says its easternmost third, east of Carman Creek and inside the Amityville school district, was once its own Census place called West Amityville; it switched to a Massapequa mailing address in 1975 and was later merged into East Massapequa, though some maps still label it West Amityville. Depending on the street, children go to Amityville, Farmingdale or Massapequa schools, and Massapequa High School and Berner Middle School both sit inside the hamlet. The Sunrise Mall, long the area's big landmark, closed in April 2025. The Census Bureau puts the hamlet at 3.6 square miles, about 2.5% of it water.
The Census Bureau's latest five-year survey counts about 7,100 homes, with a median year built of 1958. 51% went up in the 1950s alone and 15% in the 1960s; 21% were built after 1980. 84% are single-family detached houses, and 90% are owner-occupied.
So the typical house here has drain and water lines around 65 to 70 years old, unless they've been replaced. Several slow drains at once, a gurgling floor drain, or rusty water from one tap are the signs to have the main line and supply piping checked.
A third still heat with oil.
The ACS shows 57% of East Massapequa homes heat with utility gas and 33% with fuel oil. Switching from oil to gas means new gas piping to the equipment, and often to the water heater, range and dryer. We do the gas line work. We don't sell or deliver oil.
On the county sewer.
Nassau County's health department lists East Massapequa's sewers under the Nassau County Department of Public Works (516-571-6841). A backup that stops at your house is usually in your own line to the street; we clear it. If neighbors are backed up too, call the county.
Flood risk at the south end.
Laying FEMA's current flood map over the Census boundary, about 24% of the East Massapequa CDP is in the high-risk (1% annual chance) flood zone, 21.5% in zone AE and 2.5% in the wave-action zone VE, and all of it lies in the southern end of the hamlet, toward the bay; the northern part is minimal-risk. After Sandy the state made the Massapequas a NY Rising reconstruction zone, and the Town of Oyster Bay has since finished a roughly $12 million federally funded project on low-lying south Massapequa streets that rebuilt drainage, added underground storage and installed tidal check valves, and a state (DASNY) flood diversion study for the Massapequas included East Massapequa in its project area. On a sewered street, a backwater (sewer check) valve on your 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: Liberty Utilities for most of the hamlet.
EPA's service-area map puts about 88% of residents on Liberty Utilities New York's Merrick system, about 9% on the South Farmingdale Water District and about 3% on the Massapequa Water District; check your bill. Liberty's 2026 report on 2025 water lists East Massapequa among the communities it partly serves, from 16 wells in the Magothy aquifer. Caustic soda raises the pH, a phosphate compound limits corrosion and holds iron in solution, and treatment includes iron filters at three wells, carbon filters at one and advanced oxidation for 1,4-dioxane at one. Total hardness was just 1.6 to 19.3 mg/L, which is very soft; PFOA and PFOS were not detected, and 1,4-dioxane was no more than 0.38 micrograms per liter against a 1.0 limit. Across the whole Merrick district, Liberty's state inventory counts 28 lead and 524 galvanized service lines on the customer side. Massapequa Water District streets also get very soft water (1.5 to 16.7 mg/L in 2025), and that district's inventory shows one lead line out of 13,526. Soft, low-mineral water is why corrosion control matters for old copper and galvanized pipe. For a leak at the curb, call Liberty at 1-877-426-6999 or your district.
Permits and licensing: Town of Oyster Bay.
East Massapequa 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.
