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Unionville Center, Ohio
Inside Unionville Center's city limits, a shallow water table limits basements on 50% of mapped land, the 5th-highest of 5 cities in Union County. Shrink-swell clay limits houses without basements on 16%, the 4th-highest of 5 cities in Union County.
That water-table share is below Union County's 97%. FEMA's flood data list no flood losses since 2016 in ZIP code 43077 overlapping the city.
Data as of October 13, 2026 · sources · in Union County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 1 overlapping ZIP
Basement waterproofing in Unionville Center
Basement waterproofing in Unionville Center: a shallow water table limits basements on 50% of Unionville Center's mapped land.
Soil under Unionville Center city limits
| Expansive clay (limits slab homes) | 16.0% |
| High water table (limits basements) | 49.9% |
| Septic fields very limited | 97.0% |
| Clay swell (LEP, by area) | 4.7% |
| High-swell land (LEP 6%+) | 1.1% |
| Mapped soil | 103 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 16% of the mapped land.
On 50% of Unionville Center's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 97% of the land very limited for septic absorption fields.
Drought in Union County
0% of Union 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 Unionville Center. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 43077 | 100% | 0 | $0 |
Homes
Unionville Center has fewer than 100 housing units in the ACS 2020-2024 estimates, too few for reliable shares.
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Plain City | 4 mi | 38% | 90% |
| Marysville | 6 mi | 24% | 83% |
| Milford Center | 6 mi | 39% | 93% |
| Woodstock | 10 mi | 41% | over 99% |
| Dublin | 10 mi | 26% | 79% |
| Shawnee Hills | 11 mi | 6% | 94% |
| Ostrander | 12 mi | 4% | 86% |
| Hilliard | 12 mi | 31% | 88% |
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026). Methods · Data status