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Sunbury, Ohio
Inside Sunbury's city limits, a shallow water table limits basements on 92% of mapped land, the 3rd-highest of 7 cities in Delaware County. Shrink-swell clay limits houses without basements on 15%, the 3rd-highest of 7 cities in Delaware County.
That water-table share is above Delaware County's 84%. FEMA's flood data list 1 flood losses since 2016 in the 2 ZIP codes overlapping the city. Of its 3,030 homes, 27% were built before 1980; the median dates from 2005.
Data as of October 13, 2026 · sources · in Delaware 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 Sunbury
Basement waterproofing in Sunbury: a shallow water table limits basements on 92% of Sunbury's mapped land, more than in 80% of Ohio cities, and the 2 ZIP codes overlapping Sunbury logged 1 FEMA flood losses since 2016.
About 2,100 of Sunbury's 3,030 homes are detached houses.
Soil under Sunbury city limits
| Expansive clay (limits slab homes) | 14.8% |
| High water table (limits basements) | 91.6% |
| Septic fields very limited | 92.8% |
| Clay swell (LEP, by area) | 4.0% |
| High-swell land (LEP 6%+) | 0.9% |
| Urban land, not rated | 2.1% |
| Mapped soil | 4,682 acres |
| Soil series | Share here | Series nationally: high water table |
|---|---|---|
| Bennington | 37% | 99% |
| Cardington | 23% | 99% |
| Pewamo | 16% | 99% |
| Centerburg | 6% | over 99% |
| Condit | 3% | n/a |
| Sloan | 2% | n/a |
What the numbers mean here
On 92% of Sunbury's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 93% of the land very limited for septic absorption fields.
Drought in Delaware County
0% of Delaware 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 Sunbury. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 43074 | 89% | 1 | $17,849 |
| 43021 | 11% | 0 | $0 |
Homes in Sunbury
| Housing units | 3,030 |
| Median year built | 2005 |
| Built before 1980 | 27% |
| Built 2000 or later | 59% |
| Owner-occupied | 73% |
| Median value, owner-occupied | $374,600 |
| Single-family detached | 68% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Galena | 1 mi | 8% | 80% |
| Westerville | 8 mi | 5% | 63% |
| Hartford (Croton) | 10 mi | 0% | 90% |
| Centerburg | 10 mi | under 1% | 97% |
| Delaware | 11 mi | 23% | 72% |
| Marengo | 11 mi | 0% | 97% |
| Johnstown | 12 mi | 2% | 87% |
| New Albany | 12 mi | 1% | 99% |
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