States / Georgia
59 counties · median score 15
Crawl space moisture in Georgia
Most of Georgia drains well: only 9 of 59 counties score high or elevated, and the median is 15. McIntosh County is the exception at 77; crawl-space moisture problems here usually come from grading, gutters and plumbing rather than the soil itself.
- 1Wettest county McIntosh County
- 2High or elevated 9 of 59
- 3Median score 15
- 4Driest county Hart County
Georgia's soil, taken as a whole
Across the 20,452,900 acres mapped in these 59 counties, 25% of soil with a drainage class is somewhat poorly, poorly or very poorly drained, and 43% of acres report a seasonal water table within about two metres. That is a middling figure: wet ground is common in valleys and lowlands but far from universal. 59 of the 59 counties have mapped soils subject to occasional or frequent flooding.
| Drainage class | Share of mapped acres |
|---|---|
| Excessively drained | 1.9% |
| Somewhat excessively drained | 2.6% |
| Well drained | 66% |
| Moderately well drained | 4.5% |
| Somewhat poorly drained | 7.4% |
| Poorly drained | 14.1% |
| Very poorly drained | 3.5% |
Radon. By EPA zone, 4 Georgia counties here are zone 1 (highest potential), 24 zone 2 and 31 zone 3. EPA says to test regardless of zone; a sealed crawl space is the cheapest moment to add radon venting if a test calls for it.
Every Georgia county
Sorted wettest first. High and elevated counties link to their own page with the full soil breakdown.
What drives the Georgia numbers
The wettest county, McIntosh County, is 44% very poorly drained by dominant condition, with a seasonal water table averaging 0.6 ft below grade across the 85% of acres that report one, and sits in EPA radon zone 3. The driest, Hart County, is 92% well drained. 5 Georgia counties reach the high tier, where poorly drained soils, group D clays and a shallow water table occur together.
The score is a guide to the soil, not to a house: a well-graded lot with working gutters in a high county can have a dry crawl space, and a bad downspout can flood one in a low county. The R408 calculator sizes venting or encapsulation for any footprint.
Sources: USDA NRCS SSURGO via Soil Data Access (muaggatt: drclassdcd, hydgrpdcd, flodfreqdcd, pondfreqprs, wtdepannmin), acreage-weighted; EPA Map of Radon Zones, county table (June 2024 JSON). Checked 2026-10-23.