Anna, Ohio
Inside Anna's city limits, a shallow water table limits basements on 97% of mapped land, the 5th-highest of 9 cities in Shelby County. Shrink-swell clay limits houses without basements on 22%, the 5th-highest of 9 cities in Shelby County.
That water-table share is close to Shelby County's 94%. FEMA's flood data list no flood losses since 2016 in ZIP code 45302 overlapping the city. Of its 656 homes, 59% were built before 1980; the median dates from 1976.
Data as of October 13, 2026 · sources · in Shelby 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 Anna
Basement waterproofing in Anna: a shallow water table limits basements on 97% of Anna's mapped land, more than in 89% of Ohio cities.
About 500 of Anna's 656 homes are detached houses.
Soil under Anna city limits
| Expansive clay (limits slab homes) | 21.9% |
| High water table (limits basements) | 97.2% |
| Septic fields very limited | 97.2% |
| Clay swell (LEP, by area) | 4.8% |
| High-swell land (LEP 6%+) | 1.1% |
| Mapped soil | 710 acres |
What the numbers mean here
Clay swell averages a linear extensibility of 4.8% 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 97% of Anna's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 97% of the land very limited for septic absorption fields.
Drought in Shelby County
0% of Shelby 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 Anna. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 45302 | 100% | 0 | $0 |
Homes in Anna
| Housing units | 656 |
| Median year built | 1976 |
| Built before 1980 | 59% |
| Built 2000 or later | 24% |
| Owner-occupied | 69% |
| Median value, owner-occupied | $167,200 |
| Single-family detached | 81% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Botkins | 4 mi | 20% | 89% |
| Kettlersville | 5 mi | 40% | 99% |
| Port Jefferson | 6 mi | 2% | 30% |
| Sidney | 7 mi | 8% | 59% |
| Jackson Center | 7 mi | 30% | 99% |
| New Knoxville | 10 mi | 32% | over 99% |
| Minster | 11 mi | 34% | over 99% |
| Fort Loramie | 11 mi | 30% | 99% |
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