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Marysville, Ohio
Inside Marysville's city limits, a shallow water table limits basements on 83% of mapped land, the 4th-highest of 5 cities in Union County. Shrink-swell clay limits houses without basements on 24%, the 3rd-highest of 5 cities in Union County.
That water-table share is below Union County's 97%. FEMA's flood data list no flood losses since 2016 in ZIP code 43040 overlapping the city. Of its 10,472 homes, 30% were built before 1980; the median dates from 1999.
Data as of October 13, 2026 · sources · in Union 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 Marysville
Basement waterproofing in Marysville: a shallow water table limits basements on 83% of Marysville's mapped land, more than in 69% of Ohio cities.
About 6,900 of Marysville's 10,472 homes are detached houses.
Soil under Marysville city limits
| Expansive clay (limits slab homes) | 23.6% |
| High water table (limits basements) | 82.8% |
| Septic fields very limited | 83.8% |
| Clay swell (LEP, by area) | 4.8% |
| High-swell land (LEP 6%+) | 5.8% |
| Urban land, not rated | 13.8% |
| Mapped soil | 12,002 acres |
What the numbers mean here
Clay swell averages a linear extensibility of 4.8% by land area here, and 6% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 24% of the mapped land.
On 83% of Marysville's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 84% of the land very limited for septic absorption fields.
Drought in Union County
0% of Union 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 Marysville. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 43040 | 100% | 0 | $0 |
Homes in Marysville
| Housing units | 10,472 |
| Median year built | 1999 |
| Built before 1980 | 30% |
| Built 2000 or later | 47% |
| Owner-occupied | 68% |
| Median value, owner-occupied | $300,800 |
| Single-family detached | 66% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Milford Center | 6 mi | 39% | 93% |
| Unionville Center | 6 mi | 16% | 50% |
| Ostrander | 8 mi | 4% | 86% |
| Plain City | 9 mi | 38% | 90% |
| Woodstock | 10 mi | 41% | over 99% |
| Magnetic Springs | 10 mi | 25% | 97% |
| North Lewisburg | 11 mi | 19% | 98% |
| Shawnee Hills | 12 mi | 6% | 94% |
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