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South Vienna, Ohio
Inside South Vienna's city limits, a shallow water table limits basements on 69% of mapped land, the 3rd-highest of 9 cities in Clark County. Shrink-swell clay limits houses without basements on 30%, the 2nd-highest of 9 cities in Clark County.
That water-table share is above Clark County's 59%. FEMA's flood data list 7 flood losses since 2016 in ZIP code 45369 overlapping the city. Of its 225 homes, 81% were built before 1980; the median dates from 1939 or earlier.
Data as of October 13, 2026 · sources · in Clark 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 South Vienna
Basement waterproofing in South Vienna: a shallow water table limits basements on 69% of South Vienna's mapped land, more than in 54% of Ohio cities, and the ZIP code overlapping South Vienna logged 7 FEMA flood losses since 2016.
In Clark County, 13% of the 23 flood-loss buildings with a recorded foundation type had basements.
About 200 of South Vienna's 225 homes are detached houses.
Soil under South Vienna city limits
| Expansive clay (limits slab homes) | 30.0% |
| High water table (limits basements) | 69.4% |
| Septic fields very limited | 68.4% |
| Clay swell (LEP, by area) | 4.8% |
| High-swell land (LEP 6%+) | under 0.1% |
| Mapped soil | 416 acres |
What the numbers mean here
Clay swell averages a linear extensibility of 4.8% by land area here, and under 1% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 30% of the mapped land.
On 69% of South Vienna's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 68% of the land very limited for septic absorption fields.
Drought in Clark County
0% of Clark 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 South Vienna. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45369 | 100% | 7 | $154,559 |
Homes in South Vienna
| Housing units | 225 |
| Median year built | 1939 or earlier |
| Built before 1980 | 81% |
| Built 2000 or later | 4% |
| Owner-occupied | 68% |
| Median value, owner-occupied | $162,100 |
| Single-family detached | 78% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Catawba | 5 mi | 9% | 10% |
| South Charleston | 7 mi | 11% | 63% |
| Springfield | 10 mi | 6% | 31% |
| London | 10 mi | 36% | 97% |
| Mechanicsburg | 10 mi | 3% | 82% |
| Mutual | 10 mi | 10% | 94% |
| Tremont City | 13 mi | 4% | 53% |
| South Solon | 13 mi | 37% | 88% |
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