HomeSouth DakotaCampbell County

Campbell County, South Dakota

Shrink-swell clay limits houses without basements on 18% of Campbell County's mapped land, a higher share than 67% of US counties. A shallow water table limits basements on 13%.

None of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 1 flood losses here since 2016. 68% of homes were built before 1980, against 50% nationally; the median home dates from 1960.

Data as of October 13, 2026 · sources

18%

expansive clay: shrink-swell limits slab homes

13%

high water table: limits basements

0%

in drought, October 13, 2026

68%

of homes built before 1980

Soil under Campbell County

Expansive clay (limits slab homes)17.7%
High water table (limits basements)13.0%
Septic fields very limited42.4%
Clay swell (LEP, by area)4.4%
High-swell land (LEP 6%+)17.2%
Mapped soil492,326 acres
Soil seriesShare hereSeries nationally: expansive clay
Williams16%0%
Bowbells9%n/a
Bryant7%n/a
Zahl6%n/a
Linton5%n/a
Lehr4%n/a
Walworth County: 26%McIntosh County: 22%Emmons County: 14%McPherson County: 18%Edmunds County: 22%Potter County: 25%Logan County: 11%Sioux County: 33%Campbell County WalworthMcIntoshEmmonsMcPhersonEdmundsPotterLoganSiouxCampbell
Campbell County (heavy outline) and nearby counties, shaded by expansive clay share.under 10%10-25%25-40%40-60%60%+

How we count · survey areas SD021 (2025-09-10)

What the numbers mean here

Clay swell averages a linear extensibility of 4.4% by land area here, and 17% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 18% of the mapped land.

Rain over the 12 months to August 2026: 18.71 in, 0.29 in below the 1991-2020 average year of 19.00 in.

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 9 of the last 52 weeks; the most was 33.3% of its area, in 9 weeks, most recently on the September 29, 2026 map.

October 21, 2025Share of area in drought, weeklyOctober 13, 2026
Category, October 13, 2026Share of county
D0 abnormally dry or worse100%
D1 moderate drought or worse0%
D2 severe or worse0%
D3 extreme or worse0%
D4 exceptional0%

Flood losses since 2016

1 flood losses since 2016, $165,942 paid. The worst year was 2019, with 1.

YearFlood losses
20160
20170
20180
20191
20200
20210
20220
20230
20240
20250
2026 to date0

Rain

Average year, 1991-202019.00 in
12 months to August 202618.71 in (-0.29)
202523.48 in (+4.48)
Wettest year since 18952019: 27.84 in
Driest year since 18951936: 6.07 in
Days with 1 inch or more, normal at POLLOCK (16 mi away)3.2

Homes

Housing units920
Median year built1960
Built before 198068%
Built 2000 or later13%
Owner-occupied76%
Median value, owner-occupied$115,900
Single-family detached81%

What repairs cost

Published ranges from cost guides, not quotes. More sources, and where they disagree.

WorkRangeSource
Foundation repair, US $2,200 to $8,200 Fixr, January 27, 2026
Pier-and-beam repair, US $2,000 to $15,000 Fixr, January 27, 2026
Foundation inspection, US $300 to $600 Fixr, January 31, 2025

Nearby counties

PlaceDistanceExpansive clayHigh water table
Walworth County, SD 25 mi 26% 10%
McIntosh County, ND 34 mi 22% 12%
Emmons County, ND 36 mi 14% 7%
McPherson County, SD 38 mi 18% 22%
Edmunds County, SD 46 mi 22% 25%
Potter County, SD 51 mi 25% 11%
Logan County, ND 53 mi 11% 15%
Sioux County, ND 56 mi 33% 3%

Sources: USDA SSURGO (September 10, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status