State of Rhode Island: Bristol, Kent, Newport, Providence, and Washington Counties
The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in State of Rhode Island: Bristol, Kent, Newport, Providence, and Washington Counties.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Water, saline | 73K | Not rated | Not rated | ||
| Ridgebury, Leicester, and Whitman soils, 0 to 8 percent slopes, extremely stony | 52K | Poorly drained | D | Very limited | Very limited |
| Canton and Charlton fine sandy loams, 3 to 15 percent slopes, very rocky | 49K | Well drained | B | Not limited | Very limited |
| Canton and Charlton fine sandy loams, 0 to 8 percent slopes, very stony | 47K | Well drained | B | Not limited | Very limited |
| Merrimac-Urban land complex, 0 to 8 percent slopes | 33K | Somewhat excessively drained | A | Not limited | Very limited |
| Woodbridge fine sandy loam, 0 to 8 percent slopes, very stony | 32K | Moderately well drained | C/D | Very limited | Very limited |
| Hinckley loamy sand, 8 to 15 percent slopes | 27K | Excessively drained | A | Somewhat limited | Very limited |
| Water | 22K | Not rated | Not rated | ||
| Udorthents-Urban land complex | 22K | A | Somewhat limited | Very limited | |
| Canton and Charlton fine sandy loams, 8 to 15 percent slopes, very stony | 19K | Well drained | B | Somewhat limited | Very limited |
| Paxton fine sandy loam, 0 to 8 percent slopes, very stony | 14K | Well drained | C | Very limited | Very limited |
| Freetown muck, 0 to 1 percent slopes | 13K | Very poorly drained | B/D | Very limited | Very limited |
| Canton and Charlton fine sandy loams, 3 to 15 percent slopes, extremely stony | 12K | Well drained | B | Somewhat limited | Very limited |
| Canton-Charlton-Rock outcrop complex, 15 to 35 percent slopes, very stony | 11K | Well drained | B | Very limited | Very limited |
| Urban land | 11K | Not rated | Not rated | ||
| Newport silt loam, 3 to 8 percent slopes | 10K | Well drained | C | Very limited | Very limited |
| Sutton fine sandy loam, 0 to 8 percent slopes, very stony | 10K | Moderately well drained | B/D | Very limited | Very limited |
| Swansea muck, 0 to 1 percent slopes | 10K | Very poorly drained | B/D | Very limited | Very limited |
| Walpole sandy loam, 0 to 3 percent slopes | 10K | Poorly drained | B/D | Very limited | Very limited |
| Merrimac fine sandy loam, 3 to 8 percent slopes | 10K | Somewhat excessively drained | A | Not limited | Very limited |
What This Means
Building & Foundations
About 33% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 78% of soils are rated "very limited" for septic absorption fields. Despite good drainage overall, limitations may stem from shallow bedrock, steep slopes, or seasonal conditions. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.