Hamilton County, Indiana · Noblesville
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With 7% of homes built before 1960 and about 34 hard-freeze nights a year, frozen and split pipes are a leading winter risk in the county.
June brings the most downpours to Hamilton County, part of 7.5 heavy-rain days a year. Check the sump first.
7% 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.
Hamilton County's wettest day in the 2015–2024 record brought 2.3 inches, and about 82 freeze-thaw days a year mean ice dams in some winters.
2% of occupied homes in Hamilton County heat mainly with wood or propane, below the Indiana county median of 17%.
Muggy summer nights, lows of 65°F or more, come about 39 times a year in Hamilton County. Mold after a leak spreads fastest from June through August.
Local risk profile
About 365,056 people live in Hamilton County, 394 square miles in central Indiana, in roughly 144,746 homes. The county seat is Noblesville, and Fishers, Carmel and Westfield round out the largest towns. Much of its housing is recent, with a median build year of 2001.
37/100 Water Damage Risk Index: Moderate Hamilton County ranks 88 of 92 Indiana counties. See the statewide ranking and method.The three factors where Hamilton County ranks highest compared with other Indiana counties.
Pipe-freeze risk in Hamilton County sits near the middle of the state. In the 2015–2024 record the county logged about 34 nights a year at or below 20°F (37th of 92) and 108 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
On January 2, 2018 the low fell to about -14°F, and in the stretch ending March 2015 the county went 19 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
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 24 and end around Apr 19.
Rainfall is about average for Indiana. About 7.5 days a year bring an inch or more (48th of 92), most often in June, out of 42.3 inches of total precipitation. On September 8, 2018, 2.3 inches fell in a single day. The worst three-day stretch dropped 4.36 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 82 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
18% of homes in Hamilton County predate 1980, below the Indiana county median of 58.2%, which ranks 92nd of Indiana's 92 counties.
Growth since 2000 added 52% 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.
The 1980s and 1990s account for 30% 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.
Beyond water
Hamilton County averages 39 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in June. 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 expectBy main heating fuel, Hamilton County homes break down as 61% utility gas, 36% electric, 2% 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 Hamilton County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Boone, Clinton and Tipton get more pipe-freeze nights than Hamilton. Clinton County has the oldest housing nearby, with 74% of homes built before 1980.
By the numbers
| Factor | Hamilton | Indiana median | Rank |
|---|---|---|---|
| Homes built before 1960 | 6.6% | 35% | 92 of 92 |
| Homes built before 1980 | 18% | 58% | 92 of 92 |
| Homes built 2000 or later | 52% | 18% | 1 of 92 |
| Manufactured or mobile homes | 1.5% | 6.4% | 87 of 92 |
| Vacant homes | 5.2% | 9.2% | 85 of 92 |
| Wood or propane heat | 2.4% | 17% | 88 of 92 |
| Nights at 20°F or colder | 34/yr | 33/yr | 37 of 92 |
| Days with 1 inch+ of rain | 7.5/yr | 7.8/yr | 48 of 92 |
| Freeze-thaw days | 82/yr | 84/yr | 53 of 92 |
| Muggy nights (65°F+) | 39/yr | 38/yr | 44 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 Hamilton County: freezing from November to March, heavy rain in June, July 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