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Gahanna, Ohio
Inside Gahanna's city limits, a shallow water table limits basements on 71% of mapped land, higher than 55% of Ohio cities. Shrink-swell clay limits houses without basements on 2%.
That water-table share is close to Franklin County's 71%. FEMA's flood data list 13 flood losses since 2016 in ZIP code 43230 overlapping the city. Of its 14,673 homes, 42% were built before 1980; the median dates from 1985.
Data as of October 13, 2026 · sources · in Franklin 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 Gahanna
Basement waterproofing in Gahanna: a shallow water table limits basements on 71% of Gahanna's mapped land, more than in 55% of Ohio cities, and the ZIP code overlapping Gahanna logged 13 FEMA flood losses since 2016.
In Franklin County, 81% of the 176 flood-loss buildings with a recorded foundation type had basements.
About 10,000 of Gahanna's 14,673 homes are detached houses.
Soil under Gahanna city limits
| Expansive clay (limits slab homes) | 2.2% |
| High water table (limits basements) | 71.4% |
| Septic fields very limited | 81.4% |
| Clay swell (LEP, by area) | 3.8% |
| High-swell land (LEP 6%+) | under 0.1% |
| Urban land, not rated | 10.4% |
| Mapped soil | 8,072 acres |
| Soil series | Share here | Series nationally: high water table |
|---|---|---|
| Bennington | 33% | 99% |
| Cardington | 13% | 99% |
| Pewamo | 7% | 99% |
| Eldean | 5% | 0% |
| Condit | 4% | n/a |
| Centerburg | 3% | over 99% |
What the numbers mean here
On 71% of Gahanna's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 81% of the land very limited for septic absorption fields.
Drought in Franklin County
0% of Franklin 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 Gahanna. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 43230 | 92% | 13 | $81,574 |
Homes in Gahanna
| Housing units | 14,673 |
| Median year built | 1985 |
| Built before 1980 | 42% |
| Built 2000 or later | 19% |
| Owner-occupied | 71% |
| Median value, owner-occupied | $350,900 |
| Single-family detached | 68% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Minerva Park | 4 mi | 0% | 60% |
| Whitehall | 5 mi | under 1% | 63% |
| Bexley | 6 mi | under 1% | 65% |
| Westerville | 6 mi | 5% | 63% |
| Columbus | 7 mi | 8% | 63% |
| New Albany | 7 mi | 1% | 99% |
| Reynoldsburg | 7 mi | 1% | 82% |
| Riverlea | 8 mi | 0% | 35% |
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