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Greenhills, Ohio
Inside Greenhills' city limits, a shallow water table limits basements on 19% of mapped land, the 2nd-highest of 36 cities in Hamilton County. Shrink-swell clay limits houses without basements on 11%, the 4th-highest of 36 cities in Hamilton County.
That water-table share is above Hamilton County's 9%. USDA doesn't rate the 35% of mapped land classed as urban land, so these shares are floors. FEMA's flood data list 1 flood losses since 2016 in ZIP code 45218 overlapping the city. Of its 1,490 homes, 94% were built before 1980; the median dates from 1955.
Data as of October 13, 2026 · sources · in Hamilton 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 Greenhills
Basement waterproofing in Greenhills: a shallow water table limits basements on 19% of Greenhills' mapped land, and the ZIP code overlapping Greenhills logged 1 FEMA flood losses since 2016.
In Hamilton County, 52% of the 251 flood-loss buildings with a recorded foundation type had basements.
About 1,000 of Greenhills' 1,490 homes are detached houses.
Soil under Greenhills city limits
| Expansive clay (limits slab homes) | 10.5% |
| High water table (limits basements) | 18.8% |
| Septic fields very limited | 37.4% |
| Clay swell (LEP, by area) | 4.9% |
| High-swell land (LEP 6%+) | 10.5% |
| Urban land, not rated | 35.4% |
| Mapped soil | 795 acres |
What the numbers mean here
On 19% of Greenhills' mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
Drought in Hamilton County
0% of Hamilton 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 Greenhills. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45218 | 94% | 1 | $4,554 |
Homes in Greenhills
| Housing units | 1,490 |
| Median year built | 1955 |
| Built before 1980 | 94% |
| Built 2000 or later | 4% |
| Owner-occupied | 66% |
| Median value, owner-occupied | $174,100 |
| Single-family detached | 64% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Forest Park | 1 mi | 3% | 10% |
| Woodlawn | 3 mi | under 1% | 5% |
| Mount Healthy | 3 mi | 1% | 7% |
| Springdale | 3 mi | under 1% | 1% |
| Glendale | 3 mi | under 1% | 4% |
| Wyoming | 3 mi | 12% | 5% |
| Lincoln Heights | 4 mi | 0% | 1% |
| North College Hill | 4 mi | under 1% | 9% |
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