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Gallipolis, Ohio
Inside Gallipolis' city limits, a shallow water table limits basements on 33% of mapped land, the 4th-highest of 6 cities in Gallia County. Shrink-swell clay limits houses without basements on 15%, the 3rd-highest of 6 cities in Gallia County.
That water-table share is above Gallia County's 26%. FEMA's flood data list 3 flood losses since 2016 in ZIP code 45631 overlapping the city. Of its 1,848 homes, 69% were built before 1980; the median dates from 1960.
Data as of October 13, 2026 · sources · in Gallia 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 Gallipolis
Basement waterproofing in Gallipolis: a shallow water table limits basements on 33% of Gallipolis' mapped land, and the ZIP code overlapping Gallipolis logged 3 FEMA flood losses since 2016.
About 1,500 of Gallipolis' 1,848 homes are detached houses.
Soil under Gallipolis city limits
| Expansive clay (limits slab homes) | 15.5% |
| High water table (limits basements) | 33.3% |
| Septic fields very limited | 74.4% |
| Clay swell (LEP, by area) | 4.1% |
| High-swell land (LEP 6%+) | 15.5% |
| Mapped soil | 2,445 acres |
What the numbers mean here
Clay swell averages a linear extensibility of 4.1% by land area here, and 15% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 15% of the mapped land.
On 33% of Gallipolis' mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 74% of the land very limited for septic absorption fields.
Drought in Gallia County
0% of Gallia 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 Gallipolis. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45631 | 100% | 3 | $30,611 |
Homes in Gallipolis
| Housing units | 1,848 |
| Median year built | 1960 |
| Built before 1980 | 69% |
| Built 2000 or later | 16% |
| Owner-occupied | 47% |
| Median value, owner-occupied | $119,900 |
| Single-family detached | 79% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Cheshire | 10 mi | 7% | 25% |
| Rio Grande | 11 mi | 21% | 54% |
| Vinton | 13 mi | 10% | 41% |
| Middleport | 14 mi | 16% | 22% |
| Centerville (Thurman) | 15 mi | 1% | 79% |
| Rutland | 16 mi | 40% | 32% |
| Crown City | 17 mi | 19% | 21% |
| Pomeroy | 17 mi | 44% | 14% |
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