Jefferson County, Alabama · Birmingham
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With 28% of homes built before 1960 and about 4 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
February brings the most downpours to Jefferson County, part of 14.9 heavy-rain days a year. Check the sump first.
28% 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.
Jefferson County's wettest day in the 2015–2024 record brought 3.88 inches, and about 42 freeze-thaw days a year mean ice dams in some winters.
2% of occupied homes in Jefferson County heat mainly with wood or propane, below the Alabama county median of 9.9%.
With 106 muggy nights a year, mold in Jefferson County can appear within days of a leak. Dry first, then clean.
Local risk profile
With 310,789 homes and around 667,755 residents, Jefferson County is 1,112 square miles of northern Alabama. Besides Birmingham, the county seat, the biggest communities are Hoover, Vestavia Hills and Homewood. Half the homes here were built before 1975, half after.
70/100 Water Damage Risk Index: High Jefferson County ranks 5 of 67 Alabama counties. See the statewide ranking and method.The three factors where Jefferson County ranks highest compared with other Alabama counties.
Jefferson County gets more hard-freeze nights than most of Alabama. It averaged 43 freezing nights a year over 2015–2024, 4 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 67 Alabama counties that's 12th.
Expect the hardest freezes in January, inside a season that runs January. That's when an outdoor spigot left connected to a hose, or a pipe in a crawl space, is most likely to split.
Freezing nights typically start around Nov 14 and end around Mar 16.
Rainfall is about average for Alabama. The county gets about 56.8 inches of rain and melted snow a year, with 14.9 days of an inch or more (36th of 67). Those downpours cluster in February, March and April, when sump pumps and gutters are tested hardest. The wettest day on record brought 3.88 inches on June 8, 2022. The worst three-day stretch dropped 5.82 inches, ending June 24, 2017, the kind of soaking that overwhelms sump pumps and storm sewers.
About 42 days a year swing from below freezing at night to above freezing by day. Those freeze-thaw cycles feed ice dams on roofs, open cracks in foundations and driveways, and stress pipes that are already marginal.
Housing
59% of homes in Jefferson County predate 1980, above the Alabama county median of 43.5%, which ranks 1st of Alabama's 67 counties.
In Jefferson County 28% of homes are older than 1960. If yours is one of them and the plumbing has never been replaced, expect galvanized steel supply pipe and cast iron drain lines, the two materials most likely to fail quietly.
Renters occupy 36% 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
Jefferson County averages 106 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in February. 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 Jefferson County it's 48% utility gas, 49% 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 Jefferson County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Jefferson gets more pipe-freeze nights than any of its neighbors. Its housing is the oldest in the area by share of homes built before 1980.
By the numbers
| Factor | Jefferson | Alabama median | Rank |
|---|---|---|---|
| Homes built before 1960 | 28% | 16% | 1 of 67 |
| Homes built before 1980 | 59% | 44% | 1 of 67 |
| Homes built 2000 or later | 20% | 23% | 48 of 67 |
| Manufactured or mobile homes | 3.1% | 22% | 67 of 67 |
| Vacant homes | 13% | 16% | 47 of 67 |
| Wood or propane heat | 2.1% | 9.9% | 64 of 67 |
| Nights at 20°F or colder | 4/yr | 3/yr | 12 of 67 |
| Days with 1 inch+ of rain | 15/yr | 15/yr | 36 of 67 |
| Freeze-thaw days | 42/yr | 38/yr | 26 of 67 |
| Muggy nights (65°F+) | 106/yr | 112/yr | 37 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 Jefferson County: freezing from January, heavy rain in February, March and April.
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