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Westerville, Ohio
Inside Westerville's city limits, a shallow water table limits basements on 63% of mapped land. Shrink-swell clay limits houses without basements on 5%.
That water-table share is below Franklin County's 71%. FEMA's flood data list 26 flood losses since 2016 in the 2 ZIP codes overlapping the city. Of its 15,912 homes, 46% were built before 1980; the median dates from 1982.
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 2 overlapping ZIPs
of homes built before 1980
Basement waterproofing in Westerville
Basement waterproofing in Westerville: a shallow water table limits basements on 63% of Westerville's mapped land, and the 2 ZIP codes overlapping Westerville logged 26 FEMA flood losses since 2016.
In Franklin County, 81% of the 176 flood-loss buildings with a recorded foundation type had basements.
About 10,500 of Westerville's 15,912 homes are detached houses.
Soil under Westerville city limits
| Expansive clay (limits slab homes) | 4.6% |
| High water table (limits basements) | 63.2% |
| Septic fields very limited | 71.3% |
| Clay swell (LEP, by area) | 3.8% |
| High-swell land (LEP 6%+) | 0.1% |
| Urban land, not rated | 15.8% |
| Mapped soil | 8,157 acres |
| Soil series | Share here | Series nationally: high water table |
|---|---|---|
| Bennington | 28% | 99% |
| Cardington | 14% | 99% |
| Pewamo | 7% | 99% |
| Medway | 3% | n/a |
| Sloan | 3% | n/a |
| Condit | 2% | n/a |
What the numbers mean here
On 63% of Westerville's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 71% 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 Westerville. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 43081 | 68% | 23 | $496,258 |
| 43082 | 32% | 3 | $7,397 |
Homes in Westerville
| Housing units | 15,912 |
| Median year built | 1982 |
| Built before 1980 | 46% |
| Built 2000 or later | 20% |
| Owner-occupied | 73% |
| Median value, owner-occupied | $374,500 |
| Single-family detached | 66% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Minerva Park | 4 mi | 0% | 60% |
| Worthington | 6 mi | under 1% | 49% |
| Gahanna | 6 mi | 2% | 71% |
| Riverlea | 7 mi | 0% | 35% |
| Galena | 7 mi | 8% | 80% |
| New Albany | 8 mi | 1% | 99% |
| Sunbury | 8 mi | 15% | 92% |
| Powell | 9 mi | 12% | 71% |
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