Warren County, New Jersey
The dominant drainage class is Well drained and the dominant hydrologic group is D (very slow infiltration, high runoff). 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 Warren County, New Jersey.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Washington silt loam, 3 to 8 percent slopes | 19K | Well drained | B | Not limited | Very limited |
| Nassau-Manlius very channery silt loams, 15 to 35 percent slopes, rocky | 10K | Somewhat excessively drained | D | Very limited | Very limited |
| Rock outcrop-Farmington-Galway complex, 15 to 35 percent slopes | 10K | Well drained | D | Very limited | Very limited |
| Hazen-Paulins Kill complex, 3 to 8 percent slopes, very stony | 9K | Well drained | A | Not limited | Very limited |
| Nassau-Manlius very channery silt loams, 8 to 15 percent slopes, rocky | 9K | Somewhat excessively drained | D | Very limited | Very limited |
| Parker-Rock outcrop complex, 45 to 65 percent slopes | 7K | Somewhat excessively drained | B | Very limited | Very limited |
| Annandale gravelly loam, 8 to 15 percent slopes | 7K | Well drained | C | Somewhat limited | Somewhat limited |
| Fredon-Halsey complex, 0 to 3 percent slopes, very stony | 7K | Somewhat poorly drained | B/D | Very limited | Very limited |
| Netcong loam, 8 to 15 percent slopes, very stony | 6K | Well drained | B | Somewhat limited | Very limited |
| Udorthents-Urban land complex, 0 to 8 percent slopes | 6K | Well drained | D | Not limited | Very limited |
| Paulins Kill-Hazen complex, 8 to 15 percent slopes, very stony | 6K | Well drained | A | Somewhat limited | Very limited |
| Wurtsboro-Swartswood complex, 8 to 15 percent slopes, extremely stony | 5K | Moderately well drained | C | Very limited | Very limited |
| Annandale gravelly loam, 3 to 8 percent slopes | 5K | Well drained | C | Not limited | Somewhat limited |
| Rock outcrop-Farmington-Galway complex, 8 to 15 percent slopes | 5K | Well drained | D | Very limited | Very limited |
| Washington silt loam, 8 to 15 percent slopes | 5K | Well drained | B | Somewhat limited | Very limited |
| Hazen-Paulins Kill complex, 0 to 3 percent slopes, very stony | 5K | Well drained | A | Not limited | Very limited |
| Water | 5K | Not rated | Not rated | ||
| Chatfield-Hollis-Rock outcrop complex, New Jersey Highlands, 35 to 60 percent slopes | 5K | Well drained | D | Very limited | Very limited |
| Parker gravelly sandy loam, 15 to 25 percent slopes | 4K | Somewhat excessively drained | B | Very limited | Very limited |
| Bartley loam, 3 to 8 percent slopes | 4K | Moderately well drained | C | Somewhat limited | Very limited |
What This Means
Building & Foundations
About 44% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 87% 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.