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Wilmington, Ohio
Inside Wilmington's city limits, a shallow water table limits basements on 93% of mapped land, the 4th-highest of 8 cities in Clinton County. Shrink-swell clay limits houses without basements on 15%, the 2nd-highest of 8 cities in Clinton County.
That water-table share is close to Clinton County's 93%. FEMA's flood data list 1 flood losses since 2016 in ZIP code 45177 overlapping the city. Of its 5,943 homes, 54% were built before 1980; the median dates from 1977.
Data as of October 13, 2026 · sources · in Clinton County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 1 overlapping ZIP
of homes built before 1980
Basement waterproofing in Wilmington
Basement waterproofing in Wilmington: a shallow water table limits basements on 93% of Wilmington's mapped land, more than in 82% of Ohio cities, and the ZIP code overlapping Wilmington logged 1 FEMA flood losses since 2016.
About 3,900 of Wilmington's 5,943 homes are detached houses.
Soil under Wilmington city limits
| Expansive clay (limits slab homes) | 14.6% |
| High water table (limits basements) | 93.4% |
| Septic fields very limited | 93.7% |
| Clay swell (LEP, by area) | 4.4% |
| High-swell land (LEP 6%+) | 0.0% |
| Mapped soil | 8,365 acres |
What the numbers mean here
On 93% of Wilmington's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 94% of the land very limited for septic absorption fields.
Drought in Clinton County
0% of Clinton County is in drought (D1 or worse) on the October 13, 2026 map. County detail.
Flood losses by ZIP code
FEMA flood records since 2016 in the ZIP codes that overlap Wilmington. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45177 | 100% | 1 | $8,527 |
Homes in Wilmington
| Housing units | 5,943 |
| Median year built | 1977 |
| Built before 1980 | 54% |
| Built 2000 or later | 18% |
| Owner-occupied | 58% |
| Median value, owner-occupied | $174,400 |
| Single-family detached | 65% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Martinsville | 7 mi | 5% | 79% |
| Port William | 9 mi | 2% | 79% |
| Clarksville | 9 mi | 0% | 41% |
| New Vienna | 10 mi | 10% | 73% |
| Midland | 10 mi | 1% | 100% |
| Harveysburg | 11 mi | under 1% | 67% |
| Sabina | 11 mi | 39% | 98% |
| Bowersville | 12 mi | 30% | 100% |
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · Census ACS 2020-2024. Methods · Data status