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Corwin, Ohio
Inside Corwin's city limits, a shallow water table limits basements on 19% of mapped land. Shrink-swell clay limits houses without basements on under 1%.
That water-table share is below Warren County's 51%. FEMA's flood data list 4 flood losses since 2016 in ZIP code 45068 overlapping the city. Of its 298 homes, 20% were built before 1980; the median dates from 2003.
Data as of October 13, 2026 · sources · in Warren 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 Corwin
Basement waterproofing in Corwin: a shallow water table limits basements on 19% of Corwin's mapped land, and the ZIP code overlapping Corwin logged 4 FEMA flood losses since 2016.
In Warren County, 42% of the 24 flood-loss buildings with a recorded foundation type had basements.
About 300 of Corwin's 298 homes are detached houses.
Soil under Corwin city limits
| Expansive clay (limits slab homes) | 0.2% |
| High water table (limits basements) | 19.1% |
| Septic fields very limited | 83.4% |
| Clay swell (LEP, by area) | 3.7% |
| High-swell land (LEP 6%+) | 0.0% |
| Urban land, not rated | 15.1% |
| Mapped soil | 209 acres |
What the numbers mean here
On 19% of Corwin's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 83% of the land very limited for septic absorption fields.
Drought in Warren County
0% of Warren 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 Corwin. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45068 | 100% | 4 | $45,442 |
Homes in Corwin
| Housing units | 298 |
| Median year built | 2003 |
| Built before 1980 | 20% |
| Built 2000 or later | 63% |
| Owner-occupied | 94% |
| Median value, owner-occupied | $321,800 |
| Single-family detached | 97% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Waynesville | 1 mi | 4% | 20% |
| Harveysburg | 4 mi | under 1% | 67% |
| Spring Valley | 7 mi | under 1% | 31% |
| Bellbrook | 8 mi | 1% | 44% |
| Centerville | 9 mi | 17% | 54% |
| Clarksville | 9 mi | 0% | 41% |
| Springboro | 9 mi | 8% | 28% |
| Lebanon | 10 mi | 16% | 27% |
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