Decatur County, Indiana
A shallow water table limits basements on 86% of Decatur County's mapped land, a higher share than 93% of US counties. Shrink-swell clay limits houses without basements on 4%.
None of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 7 flood losses here since 2016. 59% of homes were built before 1980, against 50% nationally; the median home dates from 1973.
Data as of October 13, 2026 · sources
expansive clay: shrink-swell limits slab homes
high water table: limits basements
in drought, October 13, 2026
of homes built before 1980
Soil under Decatur County
| Expansive clay (limits slab homes) | 4.0% |
| High water table (limits basements) | 86.1% |
| Septic fields very limited | 98.5% |
| Clay swell (LEP, by area) | 3.4% |
| High-swell land (LEP 6%+) | 1.1% |
| Mapped soil | 238,816 acres |
How we count · survey areas IN031 (2025-09-04)
What the numbers mean here
On 86% of Decatur County's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
Rain over the 12 months to August 2026: 52.78 in, 6.25 in above the 1991-2020 average year of 46.53 in.
USDA rates 99% of the land very limited for septic absorption fields.
Drought
0% of the county is in drought (D1 or worse) on the October 13, 2026 map. No part of the county was in drought in the last 52 weeks.
| Category, October 13, 2026 | Share of county |
|---|---|
| D0 abnormally dry or worse | 0% |
| D1 moderate drought or worse | 0% |
| D2 severe or worse | 0% |
| D3 extreme or worse | 0% |
| D4 exceptional | 0% |
Flood losses since 2016
7 flood losses since 2016, $282,079 paid. The worst year was 2021, with 3.
| Year | Flood losses |
|---|---|
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 0 |
| 2019 | 0 |
| 2020 | 0 |
| 2021 | 3 |
| 2022 | 0 |
| 2023 | 0 |
| 2024 | 0 |
| 2025 | 1 |
| 2026 to date | 1 |
Rain
| Average year, 1991-2020 | 46.53 in |
| 12 months to August 2026 | 52.78 in (+6.25) |
| 2025 | 47.00 in (+0.47) |
| Wettest year since 1895 | 2011: 59.42 in |
| Driest year since 1895 | 1934: 26.73 in |
| Days with 1 inch or more, normal at GREENSBURG (3 mi away) | 12 |
Homes
| Housing units | 11,685 |
| Median year built | 1973 |
| Built before 1980 | 59% |
| Built 2000 or later | 18% |
| Owner-occupied | 76% |
| Median value, owner-occupied | $199,100 |
| Single-family detached | 83% |
What repairs cost
Published ranges from cost guides, not quotes. More sources, and where they disagree.
Nearby counties
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Ripley County, IN | 19 mi | 5% | 77% |
| Shelby County, IN | 22 mi | 2% | 81% |
| Rush County, IN | 22 mi | 17% | 87% |
| Bartholomew County, IN | 22 mi | 4% | 67% |
| Jennings County, IN | 22 mi | 5% | 76% |
| Franklin County, IN | 24 mi | 15% | 53% |
| Fayette County, IN | 29 mi | 2% | 41% |
| Dearborn County, IN | 30 mi | 38% | 36% |
Sources: USDA SSURGO (September 4, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status