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Blue Ash, Ohio
Inside Blue Ash's city limits, a shallow water table limits basements on 8% of mapped land. Shrink-swell clay limits houses without basements on 2%.
That water-table share is close to Hamilton County's 9%. USDA doesn't rate the 53% of mapped land classed as urban land, so these shares are floors. FEMA's flood data list 18 flood losses since 2016 in the 2 ZIP codes overlapping the city. Of its 6,142 homes, 46% were built before 1980; the median dates from 1981.
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 Blue Ash
Basement waterproofing in Blue Ash: a shallow water table limits basements on 8% of Blue Ash's mapped land, and the 2 ZIP codes overlapping Blue Ash logged 18 FEMA flood losses since 2016.
In Hamilton County, 52% of the 251 flood-loss buildings with a recorded foundation type had basements.
About 3,900 of Blue Ash's 6,142 homes are detached houses.
Soil under Blue Ash city limits
| Expansive clay (limits slab homes) | 1.7% |
| High water table (limits basements) | 8.3% |
| Septic fields very limited | 16.5% |
| Clay swell (LEP, by area) | 4.6% |
| High-swell land (LEP 6%+) | 2.1% |
| Urban land, not rated | 53.4% |
| Mapped soil | 4,865 acres |
What the numbers mean here
With shrink-swell clay on 2% and a shallow water table on 8% of the land, the soil survey points to neither problem across most of Blue Ash; 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 Blue Ash. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45242 | 67% | 5 | $12,115 |
| 45241 | 23% | 13 | $548,207 |
Homes in Blue Ash
| Housing units | 6,142 |
| Median year built | 1981 |
| Built before 1980 | 46% |
| Built 2000 or later | 18% |
| Owner-occupied | 65% |
| Median value, owner-occupied | $403,200 |
| Single-family detached | 63% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Montgomery | 2 mi | 5% | 8% |
| Evendale | 2 mi | 4% | 4% |
| Sharonville | 3 mi | 2% | 9% |
| Reading | 3 mi | 7% | 4% |
| Deer Park | 3 mi | under 1% | 4% |
| Amberley | 4 mi | 6% | 15% |
| Lincoln Heights | 4 mi | 0% | 1% |
| Lockland | 4 mi | 1% | 1% |
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