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Adair County, Oklahoma

A shallow water table limits basements on 21% of Adair County's mapped land. Shrink-swell clay limits houses without basements on 14%.

100% of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 5 flood losses here since 2016. 46% of homes were built before 1980, against 50% nationally; the median home dates from 1982.

Data as of October 13, 2026 · sources

14%

expansive clay: shrink-swell limits slab homes

21%

high water table: limits basements

100%

in drought, October 13, 2026

46%

of homes built before 1980

Soil under Adair County

Expansive clay (limits slab homes)14.2%
High water table (limits basements)20.9%
Septic fields very limited92.6%
Clay swell (LEP, by area)2.6%
High-swell land (LEP 6%+)14.3%
Mapped soil369,062 acres
Soil seriesShare hereSeries nationally: high water table
Clarksville36%0%
Enders10%n/a
Linker8%n/a
Waben7%n/a
Tonti7%n/a
Hector6%n/a
Cherokee County: 20%Washington County: 24%Sequoyah County: 26%Crawford County: 15%Delaware County: 23%Benton County: 47%Mayes County: 44%Muskogee County: 48%Adair County CherokeeWashingtonSequoyahCrawfordDelawareBentonMayesMuskogeeAdair
Adair County (heavy outline) and nearby counties, shaded by high water table share.under 10%10-25%25-40%40-60%60%+

How we count · survey areas OK001 (2025-08-29)

What the numbers mean here

On 21% of Adair 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: 41.77 in, 7.98 in below the 1991-2020 average year of 49.75 in.

USDA rates 93% of the land very limited for septic absorption fields.

Drought

100% of the county is in drought (D1 or worse) on the October 13, 2026 map. Part of the county was in drought in 33 of the last 52 weeks; the most was 100% of its area, in 29 weeks, most recently on the October 13, 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 worse100%
D2 severe or worse100%
D3 extreme or worse8.9%
D4 exceptional0%

Flood losses since 2016

5 flood losses since 2016, $109,996 paid. The worst year was 2022, with 2.

YearFlood losses
20160
20171
20180
20190
20200
20212
20222
20230
20240
20250
2026 to date0

Rain

Average year, 1991-202049.75 in
12 months to August 202641.77 in (-7.98)
202554.23 in (+4.48)
Wettest year since 18951973: 76.24 in
Driest year since 18951963: 24.35 in
Days with 1 inch or more, normal at FAYETTEVILLE DRAKE FLD (28 mi away)14

Homes

Housing units8,148
Median year built1982
Built before 198046%
Built 2000 or later23%
Owner-occupied69%
Median value, owner-occupied$117,800
Single-family detached70%

What repairs cost

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

WorkRangeSource
Basement waterproofing, US $3,000 to $10,000 Fixr, February 6, 2026
Sump pump installation, US $800 to $2,000 Fixr, January 31, 2025
Crawl space encapsulation, US $2,000 to $8,000 Fixr, August 29, 2025

Nearby counties

PlaceDistanceExpansive clayHigh water table
Cherokee County, OK 19 mi 16% 20%
Washington County, AR 25 mi 20% 24%
Sequoyah County, OK 28 mi 6% 26%
Crawford County, AR 32 mi 16% 15%
Delaware County, OK 35 mi 5% 23%
Benton County, AR 38 mi 3% 47%
Mayes County, OK 43 mi 31% 44%
Muskogee County, OK 45 mi 35% 48%

Sources: USDA SSURGO (August 29, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status