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Columbus Grove, Ohio
Inside Columbus Grove's city limits, a shallow water table limits basements on 83% of mapped land, higher than 69% of Ohio cities. Shrink-swell clay limits houses without basements on 49%.
That water-table share is below Putnam County's 96%. FEMA's flood data list no flood losses since 2016 in ZIP code 45830 overlapping the city. Of its 717 homes, 68% were built before 1980; the median dates from 1960.
Data as of October 13, 2026 · sources · in Putnam 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 Columbus Grove
Basement waterproofing in Columbus Grove: a shallow water table limits basements on 83% of Columbus Grove's mapped land, more than in 69% of Ohio cities.
About 600 of Columbus Grove's 717 homes are detached houses.
Soil under Columbus Grove city limits
| Expansive clay (limits slab homes) | 48.8% |
| High water table (limits basements) | 83.0% |
| Septic fields very limited | 92.2% |
| Clay swell (LEP, by area) | 5.1% |
| High-swell land (LEP 6%+) | 27.7% |
| Urban land, not rated | 2.9% |
| Mapped soil | 790 acres |
| Soil series | Share here | Series nationally: high water table |
|---|---|---|
| Hoytville | 25% | 99% |
| Mermill | 18% | n/a |
| Millgrove | 12% | n/a |
| Belmore | 9% | n/a |
| Nappanee | 8% | n/a |
| Haskins | 7% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 5.1% by land area here, and 28% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 49% of the mapped land.
On 83% of Columbus Grove's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 92% of the land very limited for septic absorption fields.
Drought in Putnam County
0% of Putnam 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 Columbus Grove. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45830 | 100% | 0 | $0 |
Homes in Columbus Grove
| Housing units | 717 |
| Median year built | 1960 |
| Built before 1980 | 68% |
| Built 2000 or later | 13% |
| Owner-occupied | 86% |
| Median value, owner-occupied | $156,800 |
| Single-family detached | 80% |
Nearby cities
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