Andrew County, Missouri
A shallow water table limits basements on 58% of Andrew County's mapped land, a higher share than 73% of US counties. Shrink-swell clay limits houses without basements on 48%.
None of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 37 flood losses here since 2016. 51% of homes were built before 1980, against 50% nationally; the median home dates from 1980.
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 Andrew County
| Expansive clay (limits slab homes) | 47.7% |
| High water table (limits basements) | 58.0% |
| Septic fields very limited | 87.4% |
| Clay swell (LEP, by area) | 5.4% |
| High-swell land (LEP 6%+) | 38.4% |
| Mapped soil | 279,443 acres |
How we count · survey areas MO003 (2025-08-28)
What the numbers mean here
Clay swell averages a linear extensibility of 5.4% by land area here, and 38% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 48% of the mapped land.
On 58% of Andrew 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: 35.02 in, 2.27 in below the 1991-2020 average year of 37.29 in.
USDA rates 87% 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 8 of the last 52 weeks; the most was 71.5% of its area, on the March 31, 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
37 flood losses since 2016, $1.3 million paid. The worst year was 2019, with 31. Median water depth outside the building: 38.5 in.
| Year | Flood losses |
|---|---|
| 2016 | 0 |
| 2017 | 0 |
| 2018 | 1 |
| 2019 | 31 |
| 2020 | 0 |
| 2021 | 5 |
| 2022 | 0 |
| 2023 | 0 |
| 2024 | 0 |
| 2025 | 0 |
| 2026 to date | 0 |
Rain
| Average year, 1991-2020 | 37.29 in |
| 12 months to August 2026 | 35.02 in (-2.27) |
| 2025 | 33.33 in (-3.96) |
| Wettest year since 1895 | 1993: 57.17 in |
| Driest year since 1895 | 1988: 16.68 in |
| Days with 1 inch or more, normal at CONCEPTION (18 mi away) | 10.5 |
Homes
| Housing units | 7,558 |
| Median year built | 1980 |
| Built before 1980 | 51% |
| Built 2000 or later | 20% |
| Owner-occupied | 77% |
| Median value, owner-occupied | $215,400 |
| Single-family detached | 83% |
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 |
|---|---|---|---|
| DeKalb County, MO | 22 mi | 78% | 83% |
| Buchanan County, MO | 23 mi | 28% | 40% |
| Doniphan County, KS | 23 mi | 27% | 15% |
| Holt County, MO | 23 mi | 30% | 41% |
| Gentry County, MO | 26 mi | 68% | 71% |
| Nodaway County, MO | 26 mi | 79% | 62% |
| Clinton County, MO | 34 mi | 78% | 77% |
| Worth County, MO | 40 mi | 41% | 58% |
Sources: USDA SSURGO (August 28, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status