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Richwood, Ohio
Inside Richwood's city limits, a shallow water table limits basements on 86% of mapped land, the 3rd-highest of 5 cities in Union County. Shrink-swell clay limits houses without basements on 7%, the 5th-highest of 5 cities in Union County.
That water-table share is below Union County's 97%. FEMA's flood data list 2 flood losses since 2016 in ZIP code 43344 overlapping the city. Of its 995 homes, 77% were built before 1980; the median dates from 1953.
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
of homes built before 1980
Basement waterproofing in Richwood
Basement waterproofing in Richwood: a shallow water table limits basements on 86% of Richwood's mapped land, more than in 73% of Ohio cities, and the ZIP code overlapping Richwood logged 2 FEMA flood losses since 2016.
About 800 of Richwood's 995 homes are detached houses.
Soil under Richwood city limits
| Expansive clay (limits slab homes) | 6.9% |
| High water table (limits basements) | 85.6% |
| Septic fields very limited | 96.6% |
| Clay swell (LEP, by area) | 4.5% |
| High-swell land (LEP 6%+) | 1.5% |
| Mapped soil | 811 acres |
What the numbers mean here
On 86% of Richwood'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 Richwood. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 43344 | 100% | 2 | $43,404 |
Homes in Richwood
| Housing units | 995 |
| Median year built | 1953 |
| Built before 1980 | 77% |
| Built 2000 or later | 12% |
| Owner-occupied | 70% |
| Median value, owner-occupied | $180,300 |
| Single-family detached | 80% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Magnetic Springs | 5 mi | 25% | 97% |
| Prospect | 6 mi | 16% | 72% |
| Green Camp | 9 mi | 39% | 84% |
| New Bloomington | 11 mi | 78% | 92% |
| Waldo | 11 mi | 22% | 98% |
| La Rue | 11 mi | 1% | 39% |
| Ostrander | 12 mi | 4% | 86% |
| West Mansfield | 13 mi | 7% | 96% |
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