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Port William, Ohio
Inside Port William's city limits, a shallow water table limits basements on 79% of mapped land, the 5th-highest of 8 cities in Clinton County. Shrink-swell clay limits houses without basements on 2%, the 5th-highest of 8 cities in Clinton County.
That water-table share is below Clinton County's 93%. FEMA's flood data list no flood losses since 2016 in ZIP code 45164 overlapping the city.
Data as of October 13, 2026 · sources · in Clinton County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 1 overlapping ZIP
Basement waterproofing in Port William
Basement waterproofing in Port William: a shallow water table limits basements on 79% of Port William's mapped land, more than in 65% of Ohio cities.
Soil under Port William city limits
| Expansive clay (limits slab homes) | 1.9% |
| High water table (limits basements) | 79.4% |
| Septic fields very limited | 82.2% |
| Clay swell (LEP, by area) | 4.3% |
| High-swell land (LEP 6%+) | 0.0% |
| Mapped soil | 71 acres |
What the numbers mean here
On 79% of Port William's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 82% of the land very limited for septic absorption fields.
Drought in Clinton County
0% of Clinton 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 Port William. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45164 | 100% | 0 | $0 |
Homes
Port William 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 |
|---|---|---|---|
| Bowersville | 4 mi | 30% | 100% |
| Jamestown | 8 mi | under 1% | 90% |
| Wilmington | 9 mi | 15% | 93% |
| Sabina | 9 mi | 39% | 98% |
| Octa | 10 mi | 49% | 98% |
| Milledgeville | 11 mi | 38% | 100% |
| Harveysburg | 11 mi | under 1% | 67% |
| Xenia | 12 mi | 1% | 28% |
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026). Methods · Data status