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Union City, Ohio
Inside Union City's city limits, a shallow water table limits basements on over 99% of mapped land, higher than 96% of Ohio cities. Shrink-swell clay limits houses without basements on 18%.
That water-table share is close to Darke County's 96%. FEMA's flood data list 1 flood losses since 2016 in ZIP code 45390 overlapping the city. Of its 796 homes, 89% were built before 1980; the median dates from 1962.
Data as of October 13, 2026 · sources · in Darke 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 Union City
Basement waterproofing in Union City: a shallow water table limits basements on over 99% of Union City's mapped land, more than in 96% of Ohio cities, and the ZIP code overlapping Union City logged 1 FEMA flood losses since 2016.
About 600 of Union City's 796 homes are detached houses.
Soil under Union City city limits
| Expansive clay (limits slab homes) | 18.2% |
| High water table (limits basements) | 99.7% |
| Septic fields very limited | 99.7% |
| Clay swell (LEP, by area) | 4.7% |
| High-swell land (LEP 6%+) | 1.0% |
| Mapped soil | 594 acres |
What the numbers mean here
Clay swell averages a linear extensibility of 4.7% 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 18% of the mapped land.
On over 99% of Union City's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates over 99% of the land very limited for septic absorption fields.
Drought in Darke County
0% of Darke 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 Union City. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45390 | 100% | 1 | $0 |
Homes in Union City
| Housing units | 796 |
| Median year built | 1962 |
| Built before 1980 | 89% |
| Built 2000 or later | 6% |
| Owner-occupied | 58% |
| Median value, owner-occupied | $72,100 |
| Single-family detached | 74% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Ansonia | 8 mi | 25% | 93% |
| Rossburg | 10 mi | 21% | over 99% |
| Palestine | 10 mi | 1% | 94% |
| Greenville | 11 mi | 9% | 92% |
| New Weston | 12 mi | 15% | 100% |
| Burkettsville | 13 mi | 47% | over 99% |
| Wayne Lakes | 14 mi | under 1% | 14% |
| Hollansburg | 14 mi | 15% | 100% |
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