Nassau County, New York · Mineola
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Nassau County averages 15 nights a year at 20°F or colder, mostly December to March, and 66% of its homes predate 1960.
Heavy rain days of an inch or more come about 8.7 times a year here, most often in October. A sump pump that hasn't run since last season is a common weak point.
66% of homes here predate 1960, when clay and cast iron sewer laterals were standard. Roots and cracks in those lines are a common cause of backups.
In Nassau County, 3.73 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
2% of occupied homes in Nassau County heat mainly with wood or propane, below the New York county median of 19%.
With 66 muggy nights a year, mold in Nassau County can appear within days of a leak. Dry first, then clean.
Local risk profile
Nassau County covers 285 square miles of southeast New York, with about 1,389,591 residents and 479,044 homes. Besides Mineola, the county seat, the biggest communities are Hempstead, Levittown and Freeport. It has some of the oldest housing in the state: the median home went up in 1955.
68/100 Water Damage Risk Index: Elevated Nassau County ranks 7 of 57 New York counties. See the statewide ranking and method.The three factors where Nassau County ranks highest compared with other New York counties.
Nassau County is milder than most of New York, but not mild enough to skip winterizing. It averaged 72 freezing nights a year over 2015–2024, 15 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 57 New York counties that's 57th.
On February 14, 2016 the low fell to about 1°F, and in the stretch ending January 2018 the county went 13 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
Expect the hardest freezes in January, inside a season that runs December to March. That's when an outdoor spigot left connected to a hose, or a pipe in a crawl space, is most likely to split.
On average the first fall freeze arrives around Nov 17 and the last spring freeze around Apr 4.
Heavy rain is a bigger factor here than in most of New York. About 8.7 days a year bring an inch or more (6th of 57), most often in October, out of 44.8 inches of total precipitation. On September 2, 2021, 3.73 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 5.17 inches (through August 24, 2021).
The temperature crosses 32°F in both directions on roughly 62 days a year. Each cycle melts and refreezes water at roof edges and in foundation cracks, which is how ice dams and basement seepage get started.
Housing
New York's 57 counties range widely in housing age; Nassau ranks 1st, with 85% of its homes built before 1980.
66% were built before 1960. Homes from that era often still have galvanized steel supply pipe, which rusts from the inside until it pinholes, and cast iron drains that crack with age. Slow leaks behind walls are a common start to water damage in these houses.
Beyond water
Nassau County averages 66 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in December. Keep indoor humidity under 60%, as the EPA advises, and dry any leak within 24 to 48 hours; in a humid month a wet basement left alone won't dry by itself.
Mold remediation: what to expectMain heating fuel in Nassau County's occupied homes: 62% utility gas, 7% electric, 2% propane and under 1% wood. Most homes here heat with gas or electricity, so cooking and electrical faults are the likelier fire sources. Even a contained kitchen fire can send soot through the ductwork to every room.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Nassau County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Every neighboring county gets more pipe-freeze nights than Nassau. It also has the most heavy-rain days in its area. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Nassau | New York median | Rank |
|---|---|---|---|
| Homes built before 1960 | 66% | 45% | 1 of 57 |
| Homes built before 1980 | 85% | 67% | 1 of 57 |
| Homes built 2000 or later | 7.3% | 13% | 56 of 57 |
| Manufactured or mobile homes | 0.2% | 7.6% | 56 of 57 |
| Vacant homes | 4.4% | 14% | 57 of 57 |
| Wood or propane heat | 2.4% | 19% | 56 of 57 |
| Nights at 20°F or colder | 15/yr | 55/yr | 57 of 57 |
| Days with 1 inch+ of rain | 8.7/yr | 6/yr | 6 of 57 |
| Freeze-thaw days | 62/yr | 101/yr | 57 of 57 |
| Muggy nights (65°F+) | 66/yr | 12/yr | 1 of 57 |
Rank 1 is the highest value. Bars run from the lowest to the highest New York county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Nassau County: freezing from December to March, heavy rain in September, October and December.
Sources: U.S. Census Bureau, ACS 2024 5-year estimates (2020-2024); weather from NOAA nClimGrid-Daily county averages (EpiNOAA), 2015–2024, averaged across the county; county boundaries from Census TIGER. Reviewed 2026-10-21. Methodology