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District of Columbia soil by county

Across District of Columbia's mapped land, shrink-swell clay limits houses without basements on 0% and a shallow water table limits basements on 9%.

Data as of October 13, 2026 · 1 counties

District of Columbia: 0%
Expansive clay: share of mapped land where shrink-swell clay limits houses without basementsunder 10%10-25%25-40%40-60%60%+
District of Columbia: 9%
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 District of Columbia

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District of Columbia 0% 9% 0% 230 1958

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 October 13, 2026 map. Flood losses are FEMA NFIP records since 2016. Sources and methods.