Pottawattamie County, Iowa · Council Bluffs
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With 43% of homes built before 1960 and about 56 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
August brings the most downpours to Pottawattamie County, part of 6.9 heavy-rain days a year. Check the sump first.
Backups often follow heavy rain, which Pottawattamie County gets about 6.9 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
In Pottawattamie County, 5.01 inches fell on the wettest day of the 2015–2024 record. Storms like that, and ice dams in snowy winters, cause most roof leaks.
9% of occupied homes in Pottawattamie County heat mainly with wood or propane, below the Iowa county median of 22.1%.
Muggy summer nights, lows of 65°F or more, come about 38 times a year in Pottawattamie County. Mold after a leak spreads fastest from June through August.
Local risk profile
Pottawattamie County covers 951 square miles of southwest Iowa, with about 93,424 residents and 40,083 homes. The county seat is Council Bluffs, and Carter Lake, Avoca and Oakland round out the largest towns. Half the homes here were built before 1967, half after.
41/100 Water Damage Risk Index: Moderate Pottawattamie County ranks 77 of 99 Iowa counties. See the statewide ranking and method.The three factors where Pottawattamie County ranks highest compared with other Iowa counties.
Pipe-freeze risk in Pottawattamie County sits near the middle of the state. It averaged 132 freezing nights a year over 2015–2024, 56 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 99 Iowa counties that's 64th.
Cold snaps are the real risk. The worst in the record lasted 16 days below freezing (ending January 2018), and the low bottomed out near -25°F on February 16, 2021.
Expect the hardest freezes in January, inside a season that runs November to March. 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 Oct 20 and end around Apr 22.
Rainfall is about average for Iowa. Of roughly 32.9 inches of yearly precipitation, the damage comes from the 6.9 days a year with an inch or more, ranked 58th of 99. May, June and August see the most. The single wettest day in the record: 5.01 inches, August 20, 2018. The worst three-day stretch dropped 6.21 inches, ending August 21, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
About 94 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
66% of homes in Pottawattamie County predate 1980, below the Iowa county median of 72.8%, which ranks 72nd of Iowa's 99 counties.
Growth since 2000 added 18% 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.
Renters occupy 30% 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
Summer nights that don't drop below 65°F, a good marker of humid air, come about 38 times a year here, above the Iowa county median of 29. 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 Pottawattamie County's occupied homes: 71% utility gas, 20% electric, 9% 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 Pottawattamie County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Cass, Harrison and Shelby get more pipe-freeze nights than Pottawattamie. All of its neighbors see more heavy-rain days. Shelby County has the oldest housing nearby, with 79% of homes built before 1980.
By the numbers
| Factor | Pottawattamie | Iowa median | Rank |
|---|---|---|---|
| Homes built before 1960 | 43% | 48% | 69 of 99 |
| Homes built before 1980 | 66% | 73% | 72 of 99 |
| Homes built 2000 or later | 18% | 13% | 22 of 99 |
| Manufactured or mobile homes | 3.5% | 3.2% | 41 of 99 |
| Vacant homes | 6.1% | 9.5% | 91 of 99 |
| Wood or propane heat | 8.7% | 22% | 91 of 99 |
| Nights at 20°F or colder | 56/yr | 62/yr | 64 of 99 |
| Days with 1 inch+ of rain | 6.9/yr | 7.1/yr | 58 of 99 |
| Freeze-thaw days | 94/yr | 94/yr | 42 of 99 |
| Muggy nights (65°F+) | 38/yr | 29/yr | 19 of 99 |
Rank 1 is the highest value. Bars run from the lowest to the highest Iowa county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Pottawattamie County: freezing from November to March, heavy rain in May, June and August.
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