Jerusalem South, renamed in 1868.
Wikipedia says the Marsapeaque people called the area "Great Water Land," that Captain John Seaman, from Seaford in East Sussex, oversaw the first European settlement, called Jerusalem South or Seaman's Neck, and that it was renamed Seaford in 1868. Seaford has a station on the LIRR Babylon Branch and covers 2.6 square miles.
The Census Bureau's latest five-year survey counts about 5,400 homes, with a median year built of 1958. 45% went up in the 1950s, 11% before 1940, and 12% after 1980. 94% are single-family detached houses, and 93% are owner-occupied.
So a typical house here has drain and water lines around 68 years old unless they've been replaced. Slow drains in several fixtures, a gurgling floor drain or rusty water from one tap are signs to have the main line and supply piping checked.
Oil to gas means new gas piping.
The ACS shows 63% of homes heat with utility gas and 34% with fuel oil. Switching means properly sized gas piping to the new 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 sewer.
Nassau County's health department lists Seaford'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 and repair or replace the line. If neighbors are backed up too, call the county at 516-571-6841.
Flood risk.
Laying FEMA's current flood map over the Census boundary, about 32% of Seaford is in the high-risk (1% annual chance) flood zone (32.2% in zone AE; shares of the Census area, water included). 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 flood water, have them checked before relighting.
Water: Liberty Utilities New York's Merrick system.
EPA's service-area map puts essentially all residents on Liberty Utilities New York's Merrick system; your bill is the final word. Liberty's 2026 report on 2025 water says the Merrick system draws from 16 wells in the Magothy aquifer; caustic soda raises the pH and a phosphate compound limits corrosion. Total hardness was just 1.6 to 19.3 mg/L, which is very soft, and across the whole Merrick district Liberty's state inventory counts 28 lead and 524 galvanized service lines on the customer side. 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. For a leak at the curb or in the street, call your water supplier. For anything on your side of the meter, call us.
Permits.
Seaford is an unincorporated hamlet, so plumbing permits go through the Town of Hempstead Building Department (One Washington Street, Hempstead).
