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Delaware, Ohio
Inside Delaware's city limits, a shallow water table limits basements on 72% of mapped land, higher than 56% of Ohio cities. Shrink-swell clay limits houses without basements on 23%, the 2nd-highest of 7 cities in Delaware County.
That water-table share is below Delaware County's 84%. FEMA's flood data list 15 flood losses since 2016 in ZIP code 43015 overlapping the city. Of its 17,726 homes, 36% were built before 1980; the median dates from 1995.
Data as of September 22, 2026 · sources · in Delaware 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
Soil under Delaware city limits
| Expansive clay (limits slab homes) | 23.2% |
| High water table (limits basements) | 72.1% |
| Septic fields very limited | 77.3% |
| Clay swell (LEP, by area) | 4.8% |
| High-swell land (LEP 6%+) | 1.2% |
| Urban land, not rated | 7.8% |
| Mapped soil | 13,128 acres |
| Soil series | Share here | Series nationally: high water table |
|---|---|---|
| Blount | 30% | over 99% |
| Pewamo | 22% | 99% |
| Glynwood | 18% | over 99% |
| Lybrand | 3% | n/a |
| Sloan | 2% | n/a |
| Minster | 1% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 4.8% by land area here, and 1% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 23% of the mapped land.
On 72% of Delaware's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 77% 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 September 22, 2026 map. County detail.
Flood losses by ZIP code
FEMA flood records since 2016 in the ZIP codes that overlap Delaware. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 43015 | 98% | 15 | $262,101 |
Homes in Delaware
| Housing units | 17,726 |
| Median year built | 1995 |
| Built before 1980 | 36% |
| Built 2000 or later | 41% |
| Owner-occupied | 65% |
| Median value, owner-occupied | $318,400 |
| Single-family detached | 63% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Ostrander | 7 mi | 4% | 86% |
| Powell | 8 mi | 12% | 71% |
| Shawnee Hills | 9 mi | 6% | 94% |
| Ashley | 11 mi | 28% | 98% |
| Magnetic Springs | 11 mi | 25% | 97% |
| Sunbury | 11 mi | 15% | 92% |
| Galena | 11 mi | 8% | 80% |
| Waldo | 12 mi | 22% | 98% |
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (September 22, 2026) · FEMA NFIP v3 (September 9, 2026) · Census ACS 2020-2024. Methods · Data status