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Williamsport, Ohio
Inside Williamsport's city limits, a shallow water table limits basements on 84% of mapped land, the 2nd-highest of 8 cities in Pickaway County. Shrink-swell clay limits houses without basements on 22%, the 2nd-highest of 8 cities in Pickaway County.
That water-table share is above Pickaway County's 72%. FEMA's flood data list 1 flood losses since 2016 in ZIP code 43164 overlapping the city. Of its 485 homes, 70% were built before 1980; the median dates from 1965.
Data as of October 13, 2026 · sources · in Pickaway 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 Williamsport
Basement waterproofing in Williamsport: a shallow water table limits basements on 84% of Williamsport's mapped land, more than in 70% of Ohio cities, and the ZIP code overlapping Williamsport logged 1 FEMA flood losses since 2016.
About 400 of Williamsport's 485 homes are detached houses.
Soil under Williamsport city limits
| Expansive clay (limits slab homes) | 21.6% |
| High water table (limits basements) | 84.0% |
| Septic fields very limited | 92.1% |
| Clay swell (LEP, by area) | 4.4% |
| High-swell land (LEP 6%+) | 0.7% |
| Urban land, not rated | 3.9% |
| Mapped soil | 1,156 acres |
What the numbers mean here
Clay swell averages a linear extensibility of 4.4% 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 22% of the mapped land.
On 84% of Williamsport'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 Pickaway County
0% of Pickaway 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 Williamsport. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 43164 | 100% | 1 | $0 |
Homes in Williamsport
| Housing units | 485 |
| Median year built | 1965 |
| Built before 1980 | 70% |
| Built 2000 or later | 1% |
| Owner-occupied | 73% |
| Median value, owner-occupied | $155,200 |
| Single-family detached | 86% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Clarksburg | 6 mi | 11% | 88% |
| New Holland | 8 mi | 23% | 76% |
| Darbyville | 8 mi | 1% | 41% |
| Circleville | 10 mi | 5% | 34% |
| South Bloomfield | 12 mi | 3% | 30% |
| Mount Sterling | 12 mi | 31% | 91% |
| Frankfort | 13 mi | 7% | 44% |
| Ashville | 13 mi | 18% | 80% |
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