Marion County, Indiana · Indianapolis
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Marion County averages 32 nights a year at 20°F or colder, mostly November to March, and 33% of its homes predate 1960.
Heavy rain days of an inch or more come about 8.2 times a year here, most often in July. A sump pump that hasn't run since last season is a common weak point.
Sewage backups in Marion County spike on heavy-rain days, about 8.2 a year, when sewer mains fill up and water finds the lowest drain.
Roof leaks here come from summer downpours and, with about 81 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
2% of occupied homes in Marion County heat mainly with wood or propane, below the Indiana county median of 17%.
About 47 nights a year here stay at 65°F or warmer, so basements and crawl spaces can grow mold even without a leak.
Local risk profile
With 441,040 homes and around 975,809 residents, Marion County is 396 square miles of central Indiana. Indianapolis is the county seat; Indianapolis city (balance), Lawrence and Beech Grove are the next largest communities. Half the homes here were built before 1973, half after.
53/100 Water Damage Risk Index: Elevated Marion County ranks 37 of 92 Indiana counties. See the statewide ranking and method.The three factors where Marion County ranks highest compared with other Indiana counties.
Pipe-freeze risk in Marion County sits near the middle of the state. In the 2015–2024 record the county logged about 32 nights a year at or below 20°F (47th of 92) and 105 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
Cold snaps are the real risk. The worst in the record lasted 14 days below freezing (ending January 2018), and the low bottomed out near -12°F on January 2, 2018.
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 29 and end around Apr 18.
Rainfall is about average for Indiana. The county gets about 42.9 inches of rain and melted snow a year, with 8.2 days of an inch or more (40th of 92). Those downpours cluster in March, June and July, when sump pumps and gutters are tested hardest. The wettest day on record brought 2.61 inches on June 19, 2021. The worst three-day stretch dropped 4.47 inches, ending September 9, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 81 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
59% of homes in Marion County predate 1980, close to the Indiana county median of 58.2%, which ranks 42nd of Indiana's 92 counties.
Older and newer homes sit side by side here: 33% predate 1960 and 18% are from 2000 or later. Corroded pipe is the typical failure in the first group, burst supply hoses in the second.
23% 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 44% 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
Marion County averages 47 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in July. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectBy main heating fuel, Marion County homes break down as 56% utility gas, 42% 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 Marion County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Boone, Hamilton and Hendricks get more pipe-freeze nights than Marion. Shelby County has the oldest housing nearby, with 62% of homes built before 1980.
By the numbers
| Factor | Marion | Indiana median | Rank |
|---|---|---|---|
| Homes built before 1960 | 33% | 35% | 53 of 92 |
| Homes built before 1980 | 59% | 58% | 42 of 92 |
| Homes built 2000 or later | 18% | 18% | 50 of 92 |
| Manufactured or mobile homes | 1.5% | 6.4% | 87 of 92 |
| Vacant homes | 9.2% | 9.2% | 46 of 92 |
| Wood or propane heat | 1.7% | 17% | 91 of 92 |
| Nights at 20°F or colder | 32/yr | 33/yr | 47 of 92 |
| Days with 1 inch+ of rain | 8.2/yr | 7.8/yr | 40 of 92 |
| Freeze-thaw days | 81/yr | 84/yr | 62 of 92 |
| Muggy nights (65°F+) | 47/yr | 38/yr | 23 of 92 |
Rank 1 is the highest value. Bars run from the lowest to the highest Indiana county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Marion County: freezing from November to March, heavy rain in March, June and July.
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