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Napoleon, Ohio
Inside Napoleon's city limits, a shallow water table limits basements on 82% of mapped land, higher than 67% of Ohio cities. Shrink-swell clay limits houses without basements on 47%.
That water-table share is below Henry County's 96%. FEMA's flood data list 1 flood losses since 2016 in ZIP code 43545 overlapping the city. Of its 3,954 homes, 71% were built before 1980; the median dates from 1963.
Data as of October 13, 2026 · sources · in Henry 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 Napoleon
Basement waterproofing in Napoleon: a shallow water table limits basements on 82% of Napoleon's mapped land, more than in 67% of Ohio cities, and the ZIP code overlapping Napoleon logged 1 FEMA flood losses since 2016.
About 2,800 of Napoleon's 3,954 homes are detached houses.
Soil under Napoleon city limits
| Expansive clay (limits slab homes) | 46.9% |
| High water table (limits basements) | 81.7% |
| Septic fields very limited | 83.5% |
| Clay swell (LEP, by area) | 5.5% |
| High-swell land (LEP 6%+) | 33.6% |
| Urban land, not rated | 2.8% |
| Mapped soil | 4,221 acres |
| Soil series | Share here | Series nationally: high water table |
|---|---|---|
| Hoytville | 17% | 99% |
| Lenawee | 12% | n/a |
| Fulton | 10% | n/a |
| Toledo | 9% | n/a |
| Haskins | 5% | n/a |
| Nappanee | 5% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 5.5% by land area here, and 34% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 47% of the mapped land.
On 82% of Napoleon's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 84% of the land very limited for septic absorption fields.
Drought in Henry County
0% of Henry 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 Napoleon. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 43545 | 100% | 1 | $0 |
Homes in Napoleon
| Housing units | 3,954 |
| Median year built | 1963 |
| Built before 1980 | 71% |
| Built 2000 or later | 6% |
| Owner-occupied | 73% |
| Median value, owner-occupied | $146,600 |
| Single-family detached | 71% |
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