Mahoning County, Ohio
A shallow water table limits basements on 77% of Mahoning County's mapped land, a higher share than 86% of US counties. Shrink-swell clay limits houses without basements on 9%.
None of the county is in drought on the November 3, 2026 Drought Monitor map. FEMA's flood data list 48 flood losses here since 2016, 75% of them in buildings with basements. 76% of homes were built before 1980, against 50% nationally; the median home dates from 1963.
Data as of November 3, 2026 · sources
expansive clay: shrink-swell limits slab homes
high water table: limits basements
in drought, November 3, 2026
of homes built before 1980
Soil under Mahoning County
| Expansive clay (limits slab homes) | 8.7% |
| High water table (limits basements) | 77.0% |
| Septic fields very limited | 88.4% |
| Clay swell (LEP, by area) | 3.0% |
| High-swell land (LEP 6%+) | 8.2% |
| Urban land, not rated | 4.0% |
| Mapped soil | 272,237 acres |
How we count · survey areas OH099 (2025-09-02)
What the numbers mean here
On 77% of Mahoning County's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
Rain over the 12 months to August 2026: 39.45 in, 1.23 in below the 1991-2020 average year of 40.68 in.
USDA rates 88% of the land very limited for septic absorption fields.
Drought
0% of the county is in drought (D1 or worse) on the November 3, 2026 map. No part of the county was in drought in the last 52 weeks.
| Category, November 3, 2026 | Share of county |
|---|---|
| D0 abnormally dry or worse | 0% |
| D1 moderate drought or worse | 0% |
| D2 severe or worse | 0% |
| D3 extreme or worse | 0% |
| D4 exceptional | 0% |
Flood losses since 2016
48 flood losses since 2016, $591,768 paid. The worst year was 2019, with 14. Foundations of the buildings, where recorded: 75% basements, 19% slabs, 6% elevated. Median water depth outside the building: 9 in.
| Year | Flood losses |
|---|---|
| 2016 | 0 |
| 2017 | 0 |
| 2018 | 8 |
| 2019 | 14 |
| 2020 | 1 |
| 2021 | 1 |
| 2022 | 13 |
| 2023 | 0 |
| 2024 | 1 |
| 2025 | 1 |
| 2026 to date | 9 |
Rain
| Average year, 1991-2020 | 40.68 in |
| 12 months to August 2026 | 39.45 in (-1.23) |
| 2025 | 38.34 in (-2.34) |
| Wettest year since 1895 | 2011: 54.18 in |
| Driest year since 1895 | 1963: 25.93 in |
| Days with 1 inch or more, normal at WARREN 3 S (13 mi away) | 7.6 |
Homes
| Housing units | 107,990 |
| Median year built | 1963 |
| Built before 1980 | 76% |
| Built 2000 or later | 9% |
| Owner-occupied | 70% |
| Median value, owner-occupied | $154,700 |
| Single-family detached | 77% |
What repairs cost
Published ranges from cost guides, not quotes. More sources, and where they disagree.
Cities in Mahoning County
| City | Expansive clay | High water table | Homes |
|---|---|---|---|
| Beloit | 3% | 84% | 459 |
| Campbell | 2% | 40% | 3,658 |
| Canfield | 19% | 85% | 3,559 |
| Craig Beach | under 1% | 50% | 586 |
| Lowellville | 0% | 22% | 535 |
| New Middletown | 2% | 73% | 724 |
| Poland | under 1% | 53% | 1,138 |
| Sebring | 14% | 71% | 2,423 |
| Struthers | under 1% | 16% | 4,735 |
| Youngstown | under 1% | 34% | 29,397 |
Nearby counties
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Columbiana County, OH | 17 mi | 2% | 53% |
| Trumbull County, OH | 20 mi | under 1% | 77% |
| Lawrence County, PA | 23 mi | 1% | 67% |
| Portage County, OH | 25 mi | 3% | 78% |
| Beaver County, PA | 32 mi | 6% | 35% |
| Mercer County, PA | 34 mi | 0% | 87% |
| Stark County, OH | 34 mi | 4% | 60% |
| Carroll County, OH | 34 mi | 2% | 28% |
Sources: USDA SSURGO (September 2, 2025) · US Drought Monitor (November 3, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status