St. Clair County, Alabama · Ashville
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Pipes freeze in St. Clair County on about 4 nights a year, mostly January. Older homes, 6% of the stock here, are most at risk.
February brings the most downpours to St. Clair County, part of 15.5 heavy-rain days a year. Check the sump first.
Sewage backups in St. Clair County spike on heavy-rain days, about 15.5 a year, when sewer mains fill up and water finds the lowest drain.
St. Clair County's wettest day in the 2015–2024 record brought 4.09 inches, and about 43 freeze-thaw days a year mean ice dams in some winters.
7% of occupied homes in St. Clair County heat mainly with wood or propane, below the Alabama county median of 9.9%.
With 102 muggy nights a year, mold in St. Clair County can appear within days of a leak. Dry first, then clean.
Local risk profile
About 94,166 people live in St. Clair County, 632 square miles in northern Alabama, in roughly 39,247 homes. The county seat is Ashville, and Pell City, Moody and Margaret 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 St. Clair County ranks 44 of 67 Alabama counties. See the statewide ranking and method.The three factors where St. Clair County ranks highest compared with other Alabama counties.
St. Clair is on the colder side of Alabama for pipes. In the 2015–2024 record the county logged about 4 nights a year at or below 20°F (12th of 67) and 44 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Most freezing nights fall from January, peaking in January. Disconnect garden hoses and shut off outdoor spigots before the first hard frost, and keep the heat at 55°F or higher if you'll be away.
On average the first fall freeze arrives around Nov 14 and the last spring freeze around Mar 16.
Rainfall is about average for Alabama. Of roughly 57.7 inches of yearly precipitation, the damage comes from the 15.5 days a year with an inch or more, ranked 25th of 67. January, February and March see the most. The single wettest day in the record: 4.09 inches, June 20, 2021. Multi-day storms matter most for basements; the wettest three days on record here totaled 5.96 inches (through December 26, 2015).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 43 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
Alabama's 67 counties range widely in housing age; St. Clair ranks 65th, with 23% of its homes built before 1980.
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.
The 1980s and 1990s account for 31% 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.
22% of homes are manufactured or mobile homes, close to the Alabama county median of 21.7%. Their water lines run under the floor behind the skirting, so a torn skirt or failed heat tape freezes them faster than lines in a site-built house.
Beyond water
About 102 nights a year in St. Clair County stay at 65°F or warmer, a sign of muggy summer air (43rd of 67 counties). February 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 expectHeating fuel matters for fire risk. In St. Clair County it's 24% utility gas, 68% electric, 6% propane and under 1% wood. Heating equipment, cooking and electrical failures cause most home fires nationally. Even a small kitchen fire can leave soot through the whole house, because smoke follows air currents into closets, ducts and attic space.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across St. Clair County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
St. Clair gets more pipe-freeze nights than any of its neighbors. Jefferson County has the oldest housing nearby, with 59% of homes built before 1980.
By the numbers
| Factor | St. Clair | Alabama median | Rank |
|---|---|---|---|
| Homes built before 1960 | 5.9% | 16% | 65 of 67 |
| Homes built before 1980 | 23% | 44% | 65 of 67 |
| Homes built 2000 or later | 47% | 23% | 2 of 67 |
| Manufactured or mobile homes | 22% | 22% | 31 of 67 |
| Vacant homes | 11% | 16% | 61 of 67 |
| Wood or propane heat | 7% | 9.9% | 43 of 67 |
| Nights at 20°F or colder | 4/yr | 3/yr | 12 of 67 |
| Days with 1 inch+ of rain | 16/yr | 15/yr | 25 of 67 |
| Freeze-thaw days | 43/yr | 38/yr | 24 of 67 |
| Muggy nights (65°F+) | 102/yr | 112/yr | 43 of 67 |
Rank 1 is the highest value. Bars run from the lowest to the highest Alabama county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in St. Clair County: freezing from January, heavy rain in January, February and March.
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