Washington County, Nebraska
Shrink-swell clay limits houses without basements on 20% of Washington County's mapped land, a higher share than 69% of US counties. A shallow water table limits basements on 16%.
None of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 35 flood losses here since 2016. 55% of homes were built before 1980, against 50% nationally; the median home dates from 1976.
Data as of October 13, 2026 · sources
expansive clay: shrink-swell limits slab homes
high water table: limits basements
in drought, October 13, 2026
of homes built before 1980
Soil under Washington County
| Expansive clay (limits slab homes) | 19.8% |
| High water table (limits basements) | 16.0% |
| Septic fields very limited | 64.8% |
| Clay swell (LEP, by area) | 4.6% |
| High-swell land (LEP 6%+) | 13.4% |
| Mapped soil | 252,295 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Pohocco | 11% | n/a |
| Marshall | 10% | 14% |
| Monona | 9% | n/a |
| Nora | 9% | n/a |
| Ida | 8% | n/a |
| Judson | 7% | n/a |
How we count · survey areas NE177 (2025-09-08)
What the numbers mean here
Clay swell averages a linear extensibility of 4.6% by land area here, and 13% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 20% of the mapped land.
On 16% of Washington 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: 26.56 in, 5.31 in below the 1991-2020 average year of 31.87 in.
USDA rates 65% of the land very limited for septic absorption fields.
Drought
0% of the county is in drought (D1 or worse) on the October 13, 2026 map. Part of the county was in drought in 23 of the last 52 weeks; the most was 100% of its area, in 3 weeks, most recently on the August 4, 2026 map.
| Category, October 13, 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
35 flood losses since 2016, $681,026 paid. The worst year was 2019, with 18.
| Year | Flood losses |
|---|---|
| 2016 | 7 |
| 2017 | 1 |
| 2018 | 0 |
| 2019 | 18 |
| 2020 | 0 |
| 2021 | 0 |
| 2022 | 0 |
| 2023 | 0 |
| 2024 | 6 |
| 2025 | 3 |
| 2026 to date | 0 |
Rain
| Average year, 1991-2020 | 31.87 in |
| 12 months to August 2026 | 26.56 in (-5.31) |
| 2025 | 33.26 in (+1.39) |
| Wettest year since 1895 | 1903: 41.45 in |
| Driest year since 1895 | 1936: 15.83 in |
| Days with 1 inch or more, normal at BENNINGTON 3WSW (12 mi away) | 8.4 |
Homes
| Housing units | 8,711 |
| Median year built | 1976 |
| Built before 1980 | 55% |
| Built 2000 or later | 20% |
| Owner-occupied | 83% |
| Median value, owner-occupied | $297,600 |
| Single-family detached | 84% |
What repairs cost
Published ranges from cost guides, not quotes. More sources, and where they disagree.
Nearby counties
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Douglas County, NE | 17 mi | 3% | 19% |
| Dodge County, NE | 22 mi | 22% | 41% |
| Burt County, NE | 23 mi | 32% | 30% |
| Harrison County, IA | 23 mi | 17% | 30% |
| Sarpy County, NE | 30 mi | 7% | 15% |
| Saunders County, NE | 31 mi | 54% | 24% |
| Pottawattamie County, IA | 38 mi | 14% | 25% |
| Monona County, IA | 38 mi | 30% | 46% |
Sources: USDA SSURGO (September 8, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status