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Mariemont, Ohio
Inside Mariemont's city limits, a shallow water table limits basements on 4% of mapped land. Shrink-swell clay limits houses without basements on 7%.
That water-table share is below Hamilton County's 9%. USDA doesn't rate the 43% of mapped land classed as urban land, so these shares are floors. FEMA's flood data list 93 flood losses since 2016 in the 2 ZIP codes overlapping the city. Of its 1,477 homes, 87% were built before 1980; the median dates from 1945.
Data as of October 13, 2026 · sources · in Hamilton County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 2 overlapping ZIPs
of homes built before 1980
Basement waterproofing in Mariemont
Basement waterproofing in Mariemont: a shallow water table limits basements on 4% of Mariemont's mapped land, and the 2 ZIP codes overlapping Mariemont logged 93 FEMA flood losses since 2016.
In Hamilton County, 52% of the 251 flood-loss buildings with a recorded foundation type had basements.
About 900 of Mariemont's 1,477 homes are detached houses.
Soil under Mariemont city limits
| Expansive clay (limits slab homes) | 7.5% |
| High water table (limits basements) | 3.5% |
| Septic fields very limited | 27.8% |
| Clay swell (LEP, by area) | 4.0% |
| High-swell land (LEP 6%+) | 7.5% |
| Urban land, not rated | 43.1% |
| Mapped soil | 583 acres |
What the numbers mean here
With shrink-swell clay on 7% and a shallow water table on 4% of the land, the soil survey points to neither problem across most of Mariemont; conditions still vary lot by lot.
Drought in Hamilton County
0% of Hamilton 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 Mariemont. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45227 | 82% | 16 | $88,431 |
| 45226 | 18% | 77 | $6.5 million |
Homes in Mariemont
| Housing units | 1,477 |
| Median year built | 1945 |
| Built before 1980 | 87% |
| Built 2000 or later | 12% |
| Owner-occupied | 75% |
| Median value, owner-occupied | $607,600 |
| Single-family detached | 60% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Fairfax | 1 mi | 5% | 1% |
| Newtown | 2 mi | 3% | 1% |
| Madeira | 3 mi | 8% | 7% |
| Silverton | 3 mi | 5% | 4% |
| Terrace Park | 4 mi | 1% | 1% |
| The Village of Indian Hill | 4 mi | 13% | 17% |
| Norwood | 4 mi | 1% | 3% |
| Deer Park | 4 mi | under 1% | 4% |
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