Two building programs, seventy years apart
The 2020-2024 American Community Survey counts 9,214 housing units. One large block is mid-century: 1,026 standing since 1939 or earlier, 2,019 added during the 1940s and 2,546 during the 1950s, which puts 5,591 units, roughly 61 percent, at 1959 or before, and 6,528, roughly 71 percent, at 1979 or before. A second block is recent: 1,955 units carry a build date of 2000 or later, about 21 percent of the total, and 2,686 postdate 1980 (table B25034). Heating fuel divides 5,571 on utility gas against 1,926, roughly 22 percent of occupied units, on fuel oil (table B25040).
Those two blocks generate different work. On anything raised since 2000 the file is the subject: whether the permit reached final sign-off, whether the certificate of occupancy matches what was actually built, whether energy code documentation exists for the envelope and the equipment. On a 1940s or 1950s house the subject is service life, meaning a panel enlarged in stages, galvanized supply piping replaced only where a wall happened to be open, and a chimney reused for equipment it was never lined for.
546 attached houses, and the items they add
Structure counts give 6,426 single-family detached units, 546 single-family attached and 860 in buildings of 10 to 19 units (table B25024). Owner-occupancy runs 6,112 of 8,763 occupied units, with 2,651 rented (table B25003). A shared wall adds questions a freestanding house never raises: whether fire separation in the party wall is continuous up to the roof deck, where roof water goes at the point two roofs meet, and who decides on a covering that spans a property line. Those are building-by-building findings, never a description of a street.
Where each answer is kept
The Census Bureau classes Uniondale as a census designated place, Uniondale CDP, and locates that geography in the Town of Hempstead. No incorporated village exists here, so no village hall holds anything.
- Building and plumbing permits, the certificate of occupancy record, violation history: the Town of Hempstead. Code administration and enforcement in New York sit with the municipality holding jurisdiction, and the Uniform Code and Energy Code themselves live in Title 19 of the state's rules and regulations (building standards and codes).
- Wastewater: the Nassau County Department of Public Works, named against Uniondale in the county's community table with no collection-district footnote on the row (sewer districts by community).
- Drinking water: the state health department's Nassau contact list holds no Uniondale row at all. It carries the Town of Hempstead Water Department, public water system NY2900000, 110,000 served, 1995 Prospect Avenue, East Meadow (public water system contacts). The list registers systems and not territories, so an address is matched to a supplier by its bill.
An envelope and a boundary are different instruments. A CDP outline exists to count people; it decides nothing about which counter takes an application, and mail addressed to Uniondale can fall outside the counted outline.
The sewer answer, and the two things it does not settle
The county's table names the Nassau County Department of Public Works against Uniondale, with no collection-district footnote, and leaves it off the roster of 34 communities the same table marks Not Publicly Sewered. Two things stop the row being the last word. The document cannot be dated, carrying nothing on its face to date it and coming from a host that returns no modification time, so it has to be quoted as what the county lists rather than as a current position. And its granularity is the community, so it says nothing about whether one house was ever tied in, or whether the pit it used beforehand was filled and certified. The parcel record is on the county Land Records Viewer, and the connection belongs in writing from the seller. One consequence of sitting inside a district: the county SEPTIC program, worth up to $20,000 and aimed at properties still on a septic system or cesspool, is generally out of reach.
Flood exposure is recorded against the town
No Uniondale row exists in FEMA's Community Status Book. Participation for an address here runs through the Town of Hempstead, CID 360467#, first flood hazard boundary map 04/25/75, first FIRM 04/16/79, current effective map date 09/11/09, and the Community Rating System columns are empty, so no reduction in a flood insurance premium is available (community status book).
A town entry is a wide instrument. It covers shoreline, inland hamlets and everything between, and therefore describes conditions for none of them. Zone X does not mean safe ground either, since the 0.2 percent annual chance floodplain is drawn within it. Everything usable is printed on the panel for the lot at the FEMA Map Service Center: the zone, the panel number and the effective date.
No station of this name
Every row of the state's rail station dataset was checked and none carries the name Uniondale (Long Island Rail Road station points). That is the whole claim.
Oil heat, and a buried tank as the open question
1,926 occupied units report fuel oil, which makes an oil tank worth raising at the first conversation rather than the last. The state's environmental agency singles out Nassau, Suffolk and Westchester as delegated counties and tells homeowners there to ask the county health agency whether tanks smaller than the state's 1,100-gallon registration threshold are regulated anyway (underground heating oil tanks guide). The same guide prints a removal range, “$1000 to $5,000 depending on the size of the tank, its condition, and how easily it can be reached”, and states that “Contamination must be reported to the Spills Hotline by calling 1-800-457-7362.”
Put it on the seller's form
Both questions this page keeps returning to appear on one state document, which a seller must hand over, the form crediting the buyer $500 otherwise. Item 28 of the Property Condition Disclosure Statement, DOS-1614-f, asks which of public sewer, private sewer, septic or cesspool serves the property, how old that arrangement is and the date it was last pumped. Item 14 asks whether a fuel storage tank sits above or below ground and whether one has ever leaked (the state's form).