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Arizona soil by county

Across Arizona's mapped land, shrink-swell clay limits houses without basements on 13% and a shallow water table limits basements on under 1%.

Highest clay shares: Greenlee County (35%), Graham County (32%), Gila County (30%), Yavapai County (29%), Cochise County (28%). Highest water-table shares: Apache County (2%), Coconino County (1%), Maricopa County (1%), Greenlee County (1%), Cochise County (under 1%).

Data as of September 22, 2026 · 15 counties

Apache County: 7%Cochise County: 28%Coconino County: 15%Gila County: 30%Graham County: 32%Greenlee County: 35%La Paz County: 2%Maricopa County: 3%Mohave County: 6%Navajo County: 7%Pima County: 9%Pinal County: 15%Santa Cruz County: 16%Yavapai County: 29%Yuma County: 1%
Expansive clay: share of mapped land where shrink-swell clay limits houses without basementsunder 10%10-25%25-40%40-60%60%+
Apache County: 2%Cochise County: 0%Coconino County: 1%Gila County: 0%Graham County: 0%Greenlee County: 1%La Paz County: 0%Maricopa County: 1%Mohave County: 0%Navajo County: 0%Pima County: 0%Pinal County: 0%Santa Cruz County: 0%Yavapai County: 0%Yuma County: 0%
High water table: share of mapped land where a shallow water table limits basementsunder 10%10-25%25-40%40-60%60%+

Every county in Arizona

Select a column heading to sort.
Apache County 7% 2% 100% 3 1987
Cochise County 28% under 1% 0% 15 1987
Coconino County 15% 1% 64% 99 1991
Gila County 30% under 1% 34% 33 1986
Graham County 32% under 1% 57% 12 1987
Greenlee County 35% 1% 96% 1 1980
La Paz County 2% under 1% 100% 3 1985
Maricopa County 3% 1% 94% 281 1993
Mohave County 6% under 1% 97% 18 1995
Navajo County 7% under 1% 70% 12 1989
Pima County 9% 0% 47% 107 1986
Pinal County 15% under 1% 68% 34 2004
Santa Cruz County 16% 0% 0% 16 1991
Yavapai County 29% under 1% 24% 132 1995
Yuma County 1% under 1% 100% 8 1995

How these shares are counted

Shares are of mapped land in USDA's soil survey (SSURGO), weighted by each soil's share of every map unit. Drought is the US Drought Monitor's D1-or-worse share on the September 22, 2026 map. Flood losses are FEMA NFIP records since 2016. Sources and methods.