Boone County, Missouri · Columbia
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With 11% of homes built before 1960 and about 29 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
June brings the most downpours to Boone County, part of 8.7 heavy-rain days a year. Check the sump first.
11% 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 Boone County, 4.62 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
8% of occupied homes in Boone County heat mainly with wood or propane, below the Missouri county median of 24.5%.
With 70 muggy nights a year, mold in Boone County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 188,043 people live in Boone County, 686 square miles in central Missouri, in roughly 81,675 homes. Besides Columbia, the county seat, the biggest communities are Ashland, Centralia and Hallsville. Much of its housing is recent, with a median build year of 1991.
36/100 Water Damage Risk Index: Moderate Boone County ranks 107 of 114 Missouri counties. See the statewide ranking and method.The three factors where Boone County ranks highest compared with other Missouri counties.
For frozen pipes, Boone County is a typical Missouri county, which is still plenty. It averaged 92 freezing nights a year over 2015–2024, 29 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 114 Missouri counties that's 49th.
On January 14, 2024 the low fell to about -12°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 November to February. 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 2 and the last spring freeze around Apr 10.
Boone gets fewer downpours than most Missouri counties, but they still fill basements. Of roughly 40.4 inches of yearly precipitation, the damage comes from the 8.7 days a year with an inch or more, ranked 87th of 114. June, July and October see the most. The single wettest day in the record: 4.62 inches, July 3, 2016. Multi-day storms matter most for basements; the wettest three days on record here totaled 6.92 inches (through June 27, 2021).
The temperature crosses 32°F in both directions on roughly 72 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
34% of homes in Boone County predate 1980, below the Missouri county median of 53%, which ranks 105th of Missouri's 114 counties.
Growth since 2000 added 36% 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.
30% 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 42% 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
Boone County averages 70 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in July. Mold grows when indoor humidity stays above about 60%, the EPA's ceiling. A basement dehumidifier set to 50% and drying anything wet within 24 to 48 hours prevents most problems.
Mold remediation: what to expectMain heating fuel in Boone County's occupied homes: 48% utility gas, 44% electric, 7% 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 Boone County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Audrain, Cooper, Howard and Randolph get more pipe-freeze nights than Boone. Audrain County has the oldest housing nearby, with 65% of homes built before 1980.
By the numbers
| Factor | Boone | Missouri median | Rank |
|---|---|---|---|
| Homes built before 1960 | 11% | 25% | 104 of 114 |
| Homes built before 1980 | 34% | 53% | 105 of 114 |
| Homes built 2000 or later | 36% | 21% | 8 of 114 |
| Manufactured or mobile homes | 3.5% | 9.8% | 104 of 114 |
| Vacant homes | 6.3% | 15% | 106 of 114 |
| Wood or propane heat | 7.6% | 25% | 106 of 114 |
| Nights at 20°F or colder | 29/yr | 28/yr | 49 of 114 |
| Days with 1 inch+ of rain | 8.7/yr | 10/yr | 87 of 114 |
| Freeze-thaw days | 72/yr | 77/yr | 88 of 114 |
| Muggy nights (65°F+) | 70/yr | 65/yr | 32 of 114 |
Rank 1 is the highest value. Bars run from the lowest to the highest Missouri county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Boone County: freezing from November to February, heavy rain in June, July 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