Washington County, Arkansas · Fayetteville
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Washington County averages 16 nights a year at 20°F or colder, mostly December to February, and 7% of its homes predate 1960.
Basements flood here mostly in May. Washington County averages 13.3 days a year with an inch of rain or more.
Sewage backups in Washington County spike on heavy-rain days, about 13.3 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 69 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
6% of occupied homes in Washington County heat mainly with wood or propane, below the Arkansas county median of 10.9%.
Muggy summer nights, lows of 65°F or more, come about 73 times a year in Washington County. Mold after a leak spreads fastest from June through August.
Local risk profile
Washington County covers 941 square miles of northwest Arkansas, with about 256,765 residents and 105,461 homes. The county seat is Fayetteville, and Springdale, Farmington and Prairie Grove round out the largest towns. Much of its housing is recent, with a median build year of 1995.
32/100 Water Damage Risk Index: Moderate Washington County ranks 74 of 75 Arkansas counties. See the statewide ranking and method.The three factors where Washington County ranks highest compared with other Arkansas counties.
Washington County gets more hard-freeze nights than most of Arkansas. In the 2015–2024 record the county logged about 16 nights a year at or below 20°F (6th of 75) and 75 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
The longest cold spell was straight 10 days without the temperature rising above freezing, ending in February 2021. The coldest night reached about -10°F on February 16, 2021. Burst pipes usually show up when a spell like that breaks and the ice thaws.
The freeze season here runs December to February, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
Freezing nights typically start around Nov 2 and end around Apr 1.
Washington gets fewer downpours than most Arkansas counties, but they still fill basements. The county gets about 51.2 inches of rain and melted snow a year, with 13.3 days of an inch or more (72nd of 75). Those downpours cluster in March, May and October, when sump pumps and gutters are tested hardest. The wettest day on record brought 4.42 inches on December 27, 2015. The worst three-day stretch dropped 8.99 inches, ending December 28, 2015, the kind of soaking that overwhelms sump pumps and storm sewers.
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 69 times a year here. They're the main driver of ice dams and of water working its way through foundation cracks in late winter.
Housing
27% of homes in Washington County predate 1980, below the Arkansas county median of 46%, which ranks 71st of Arkansas's 75 counties.
Since 2000 the county has added enough housing that 42% of homes are that new. Modern PEX and copper rarely fail on their own; the leaks come from connections, appliances and storms.
32% date from 1980 to 1999, the window when polybutylene, a gray flexible plastic supply pipe, was used in some homes. It's prone to leaks at the fittings, so it's worth checking for in a house from those years.
Renters occupy 44% of homes. If you rent, the building is usually the landlord's to repair, but your belongings are only covered by renters insurance.
Beyond water
Washington County averages 73 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in May. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectBy main heating fuel, Washington County homes break down as 46% utility gas, 48% electric, 3% propane and 3% 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 Washington County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Madison gets more pipe-freeze nights than Washington. Madison County has the oldest housing nearby, with 36% of homes built before 1980.
By the numbers
| Factor | Washington | Arkansas median | Rank |
|---|---|---|---|
| Homes built before 1960 | 7.3% | 15% | 70 of 75 |
| Homes built before 1980 | 27% | 46% | 71 of 75 |
| Homes built 2000 or later | 42% | 23% | 5 of 75 |
| Manufactured or mobile homes | 4.7% | 15% | 72 of 75 |
| Vacant homes | 7.8% | 18% | 73 of 75 |
| Wood or propane heat | 5.9% | 11% | 61 of 75 |
| Nights at 20°F or colder | 16/yr | 6/yr | 6 of 75 |
| Days with 1 inch+ of rain | 13/yr | 17/yr | 72 of 75 |
| Freeze-thaw days | 69/yr | 48/yr | 3 of 75 |
| Muggy nights (65°F+) | 73/yr | 105/yr | 67 of 75 |
Rank 1 is the highest value. Bars run from the lowest to the highest Arkansas county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Washington County: freezing from December to February, heavy rain in March, May and October.
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