Blanco County, Texas · Johnson City
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Blanco County averages 2 nights a year at 20°F or colder, mostly midwinter, and 16% of its homes predate 1960.
Basements flood here mostly in May. Blanco County averages 7 days a year with an inch of rain or more.
Backups often follow heavy rain, which Blanco County gets about 7 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.
20% of occupied homes in Blanco County heat mainly with wood or propane, above the Texas county median of 6.5%.
With 140 muggy nights a year, mold in Blanco County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 12,446 people live in Blanco County, 709 square miles in central Texas, in roughly 6,129 homes. The county seat is Johnson City, and Blanco and Round Mountain round out the largest towns. Much of its housing is recent, with a median build year of 1998.
44/100 Water Damage Risk Index: Moderate Blanco County ranks 167 of 232 Texas counties. See the statewide ranking and method.The three factors where Blanco County ranks highest compared with other Texas counties.
For frozen pipes, Blanco County is a typical Texas county, which is still plenty. It averaged 20 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.
The longest cold spell was straight 5 days without the temperature rising above freezing, ending in February 2021. The coldest night reached about 5°F on February 16, 2021. Burst pipes usually show up when a spell like that breaks and the ice thaws.
With only about 20 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 5°F, on February 16, 2021.
Rainfall is about average for Texas. About 7 days a year bring an inch or more (129th of 232), most often in May, out of 29.8 inches of total precipitation. On October 24, 2015, 3.92 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 5.51 inches (through October 25, 2015).
Housing
Roughly 26% of the county's housing was built before 1980. That puts Blanco among the newer housing stocks of Texas's 232 counties.
Since 2000 the county has added enough housing that 47% of homes are that new. Modern PEX and copper rarely fail on their own; the leaks come from connections, appliances and storms.
About 28% of homes went up between 1980 and 1999. Some houses from the late 1970s to the mid-1990s were plumbed with polybutylene, a gray plastic pipe known for failing at fittings. A plumber can tell you in a few minutes whether you have it.
Here 10% of housing is manufactured homes. Check the skirting and the heat tape on the main water line every fall, because that one exposed line is what freezes.
Beyond water
About 140 nights a year in Blanco County stay at 65°F or warmer, a sign of muggy summer air (82nd 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 Blanco County's occupied homes: 2% utility gas, 77% electric, 18% propane and 3% wood. Wood and propane heat are more common here than the state median. Have chimneys swept and fuel-burning appliances serviced each fall, and keep three feet clear around stoves and space heaters.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Blanco County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Blanco gets more pipe-freeze nights than any of its neighbors. Gillespie County has the oldest housing nearby, with 34% of homes built before 1980.
By the numbers
| Factor | Blanco | Texas median | Rank |
|---|---|---|---|
| Homes built before 1960 | 16% | 20% | 141 of 232 |
| Homes built before 1980 | 26% | 46% | 202 of 232 |
| Homes built 2000 or later | 47% | 26% | 23 of 232 |
| Manufactured or mobile homes | 9.6% | 13% | 164 of 232 |
| Vacant homes | 16% | 17% | 123 of 232 |
| Wood or propane heat | 20% | 6.5% | 7 of 232 |
| Nights at 20°F or colder | 2/yr | 3/yr | 126 of 232 |
| Days with 1 inch+ of rain | 7/yr | 7.8/yr | 129 of 232 |
| Freeze-thaw days | 19/yr | 27/yr | 151 of 232 |
| Muggy nights (65°F+) | 140/yr | 129/yr | 82 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 Blanco County: freezing from midwinter, heavy rain in May, September 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