HomeOhioWashington CountyMarietta
Marietta, Ohio
Inside Marietta's city limits, a shallow water table limits basements on 15% of mapped land, the 3rd-highest of 7 cities in Washington County. Shrink-swell clay limits houses without basements on 40%, the highest of 7 cities in Washington County.
That water-table share is close to Washington County's 19%. FEMA's flood data list 41 flood losses since 2016 in ZIP code 45750 overlapping the city. Of its 6,852 homes, 80% were built before 1980; the median dates from 1954.
Data as of October 13, 2026 · sources · in Washington 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 Marietta
Basement waterproofing in Marietta: a shallow water table limits basements on 15% of Marietta's mapped land, and the ZIP code overlapping Marietta logged 41 FEMA flood losses since 2016.
In Washington County, 23% of the 47 flood-loss buildings with a recorded foundation type had basements.
About 4,700 of Marietta's 6,852 homes are detached houses.
Soil under Marietta city limits
| Expansive clay (limits slab homes) | 40.2% |
| High water table (limits basements) | 14.8% |
| Septic fields very limited | 85.4% |
| Clay swell (LEP, by area) | 4.8% |
| High-swell land (LEP 6%+) | 39.0% |
| Urban land, not rated | 5.3% |
| Mapped soil | 5,595 acres |
What the numbers mean here
Clay swell averages a linear extensibility of 4.8% by land area here, and 39% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 40% of the mapped land.
USDA rates 85% of the land very limited for septic absorption fields.
Drought in Washington County
0% of Washington 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 Marietta. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45750 | 100% | 41 | $896,873 |
Homes in Marietta
| Housing units | 6,852 |
| Median year built | 1954 |
| Built before 1980 | 80% |
| Built 2000 or later | 4% |
| Owner-occupied | 56% |
| Median value, owner-occupied | $161,800 |
| Single-family detached | 69% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Lowell | 8 mi | 5% | 13% |
| Lower Salem | 10 mi | 4% | 6% |
| Belpre | 13 mi | 19% | 8% |
| Beverly | 13 mi | 2% | 7% |
| Macksburg | 14 mi | 10% | 22% |
| Dexter City | 16 mi | 46% | 43% |
| Stockport | 21 mi | 4% | 5% |
| Matamoras (New Matamoras) | 21 mi | under 1% | 21% |
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