DeKalb County, Tennessee · Smithville
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With 11% of homes built before 1960 and about 12 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
Basements flood here mostly in February. DeKalb County averages 15 days a year with an inch of rain or more.
Sewage backups in DeKalb County spike on heavy-rain days, about 15 a year, when sewer mains fill up and water finds the lowest drain.
DeKalb County's wettest day in the 2015–2024 record brought 4.57 inches, and about 66 freeze-thaw days a year mean ice dams in some winters.
3% of occupied homes in DeKalb County heat mainly with wood or propane, below the Tennessee county median of 7.8%.
With 68 muggy nights a year, mold in DeKalb County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 20,959 people live in DeKalb County, 304 square miles in central Tennessee, in roughly 10,155 homes. Smithville is the county seat; Alexandria, Dowelltown and Liberty are the next largest communities. Much of its housing is recent, with a median build year of 1986.
46/100 Water Damage Risk Index: Elevated DeKalb County ranks 64 of 95 Tennessee counties. See the statewide ranking and method.The three factors where DeKalb County ranks highest compared with other Tennessee counties.
DeKalb is on the colder side of Tennessee for pipes. It averaged 71 freezing nights a year over 2015–2024, 12 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 95 Tennessee counties that's 31st.
On January 17, 2024 the low fell to about -7°F, and in the stretch ending February 2015 the county went 5 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
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.
On average the first fall freeze arrives around Oct 31 and the last spring freeze around Apr 4.
Heavy rain is a bigger factor here than in most of Tennessee. About 15 days a year bring an inch or more (27th of 95), most often in February, out of 59.2 inches of total precipitation. On March 28, 2021, 4.57 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 6.08 inches (through March 28, 2021).
The temperature crosses 32°F in both directions on roughly 66 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
42% of homes in DeKalb County predate 1980, close to the Tennessee county median of 41.2%, which ranks 45th of Tennessee's 95 counties.
Older and newer homes sit side by side here: 11% predate 1960 and 30% are from 2000 or later. Corroded pipe is the typical failure in the first group, burst supply hoses in the second.
The 1980s and 1990s account for 28% of the county's homes. If yours is from those decades, look under the sinks and at the water heater for gray plastic pipe stamped PB, which is polybutylene and leak-prone.
Here 12% 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.
The Census counted 15% of homes as vacant, above the Tennessee county median of 11.9%. Empty houses are where a small leak turns into a large claim, because nobody is there to hear it.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 68 times a year here, close to the Tennessee county median of 74. 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 expectHeating fuel matters for fire risk. In DeKalb County it's 46% utility gas, 50% electric, 2% 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 DeKalb County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Putnam gets more pipe-freeze nights than DeKalb. Warren County has the oldest housing nearby, with 52% of homes built before 1980.
By the numbers
| Factor | DeKalb | Tennessee median | Rank |
|---|---|---|---|
| Homes built before 1960 | 11% | 16% | 82 of 95 |
| Homes built before 1980 | 42% | 41% | 45 of 95 |
| Homes built 2000 or later | 30% | 27% | 34 of 95 |
| Manufactured or mobile homes | 12% | 16% | 60 of 95 |
| Vacant homes | 15% | 12% | 31 of 95 |
| Wood or propane heat | 2.6% | 7.8% | 87 of 95 |
| Nights at 20°F or colder | 12/yr | 11/yr | 31 of 95 |
| Days with 1 inch+ of rain | 15/yr | 14/yr | 27 of 95 |
| Freeze-thaw days | 66/yr | 60/yr | 18 of 95 |
| Muggy nights (65°F+) | 68/yr | 74/yr | 58 of 95 |
Rank 1 is the highest value. Bars run from the lowest to the highest Tennessee county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in DeKalb County: freezing from December to February, heavy rain in January, February 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