Williamson County, Texas · Georgetown
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Williamson County averages 2 nights a year at 20°F or colder, mostly midwinter, and 2% of its homes predate 1960.
Heavy rain days of an inch or more come about 9.2 times a year here, most often in May. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Williamson County gets about 9.2 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
Roof leaks here come from summer downpours. Most show up as ceiling stains in the room below.
4% of occupied homes in Williamson County heat mainly with wood or propane, below the Texas county median of 6.5%.
About 147 nights a year here stay at 65°F or warmer, so basements and crawl spaces can grow mold even without a leak.
Local risk profile
Williamson County covers 1,116 square miles of eastern Texas, with about 672,688 residents and 262,644 homes. Georgetown is the county seat; Round Rock, Cedar Park and Leander are the next largest communities. Much of its housing is recent, with a median build year of 2006.
37/100 Water Damage Risk Index: Moderate Williamson County ranks 205 of 232 Texas counties. See the statewide ranking and method.The three factors where Williamson County ranks highest compared with other Texas counties.
For frozen pipes, Williamson County is a typical Texas county, which is still plenty. It averaged 18 freezing nights a year over 2015–2024, 2 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 232 Texas counties that's 126th.
Cold snaps are the real risk. The worst in the record lasted 6 days below freezing (ending February 2021), and the low bottomed out near 3°F on February 16, 2021.
With only about 18 freezing nights a year, many homes here aren't built for cold, so a single arctic outbreak can burst pipes across the county. The record low in this data was about 3°F, on February 16, 2021.
Rainfall is about average for Texas. The county gets about 35 inches of rain and melted snow a year, with 9.2 days of an inch or more (98th of 232). Those downpours cluster in April, May and August, when sump pumps and gutters are tested hardest. The wettest day on record brought 4.1 inches on October 24, 2015. Multi-day storms matter most for basements; the wettest three days on record here totaled 6.83 inches (through October 25, 2015).
Housing
9% of homes in Williamson County predate 1980, below the Texas county median of 45.8%, which ranks 231st of Texas's 232 counties.
Growth since 2000 added 64% of today's homes. In houses that new, the weak points are washing machine hoses, ice maker lines, water heaters and sump pumps rather than the pipes in the walls.
26% 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 34% 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
About 147 nights a year in Williamson County stay at 65°F or warmer, a sign of muggy summer air (69th of 232 counties). May is the wettest month. 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 Williamson County's occupied homes: 46% utility gas, 50% electric, 4% propane and under 1% wood. Fires here are likelier to start in the kitchen or the wiring than in the furnace. After any fire, keep the HVAC off until ducts are checked, or soot will travel through the house.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Williamson County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Williamson gets more pipe-freeze nights than any of its neighbors. Milam County has the oldest housing nearby, with 46% of homes built before 1980.
By the numbers
| Factor | Williamson | Texas median | Rank |
|---|---|---|---|
| Homes built before 1960 | 2.4% | 20% | 228 of 232 |
| Homes built before 1980 | 9.4% | 46% | 231 of 232 |
| Homes built 2000 or later | 64% | 26% | 3 of 232 |
| Manufactured or mobile homes | 1.9% | 13% | 229 of 232 |
| Vacant homes | 3.9% | 17% | 232 of 232 |
| Wood or propane heat | 3.6% | 6.5% | 180 of 232 |
| Nights at 20°F or colder | 2/yr | 3/yr | 126 of 232 |
| Days with 1 inch+ of rain | 9.2/yr | 7.8/yr | 98 of 232 |
| Freeze-thaw days | 17/yr | 27/yr | 160 of 232 |
| Muggy nights (65°F+) | 147/yr | 129/yr | 69 of 232 |
Rank 1 is the highest value. Bars run from the lowest to the highest Texas county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Williamson County: freezing from midwinter, heavy rain in April, May and August.
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