Coos County Area, New Hampshire
The most common soil here is Tunbridge, on about 10% of the land: a fine sandy loam, gritty and crumbly. Peru and Howland come next.
About 53% of the land drains well, and 18% stays wet for long stretches; groundwater comes within two feet of the surface under 46% of it.
USDA rates 94% of the land very limited for a standard septic drain field, and 89% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 2% of the land floods occasionally or more, and bedrock lies within 40 inches under 33% of it.
Soils change over short distances, so look up an address below for the soil at that exact spot and the reasons behind each rating.
The soils you're most likely standing on
The biggest named soils in Coos County Area, New Hampshire, each drawn five feet deep from its official USDA description, in its recorded colors.
Dots mark gravel; white flecks mark lime. Shares are by acres across the survey area, and each mapped patch usually mixes several of these soils.
The biggest mapped areas
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). The most common soil order is Spodosols — acidic forest soils with a distinctive leached layer, common under conifers. 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 Coos County Area, New Hampshire. Search your address to find the exact soil composition, drainage, and series details at your specific location.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Tunbridge-Plaisted association, moderately steep, very stony | 38K | Well drained | B | Very limited | Very limited |
| Howland-Cabot association, gently sloping, very stony | 32K | Moderately well drained | C | Very limited | Very limited |
| Peru-Pillsbury association, 0 to 8 percent slopes, very stony | 26K | Moderately well drained | C/D | Very limited | Very limited |
| Tunbridge-Lyman-Marlow association, 15 to 35 percent slopes, very stony | 26K | Well drained | C | Very limited | Very limited |
| Tunbridge-Lyman-Rock outcrop complex, 25 to 60 percent slopes | 26K | Well drained | C | Very limited | Very limited |
| Cabot-Howland association, gently sloping, very stony | 23K | Poorly drained | D | Very limited | Very limited |
| Water | 22K | Not rated | Not rated | ||
| Marlow-Peru association, 15 to 35 percent slopes, very stony | 21K | Well drained | C | Very limited | Very limited |
| Saddleback-Glebe-Ricker association, steep, very stony | 19K | Well drained | D | Very limited | Very limited |
| Tunbridge-Plaisted association, gently sloping, very stony | 18K | Well drained | B | Very limited | Very limited |
| Pillsbury fine sandy loam, 0 to 8 percent slopes, very stony | 18K | Poorly drained | D | Very limited | Very limited |
| Howland-Plaisted association, 15 to 35 percent slopes, very stony | 14K | Moderately well drained | C/D | Very limited | Very limited |
| Pillsbury-Peacham-Peru association, 0 to 15 percent slopes, very stony | 14K | Poorly drained | D | Very limited | Very limited |
| Glebe-Saddleback-Sisk association, moderately steep, very stony | 14K | Well drained | C | Very limited | Very limited |
| Peru fine sandy loam, 8 to 15 percent slopes, very stony | 14K | Moderately well drained | C/D | Very limited | Very limited |
| Tunbridge-Plaisted-Lyman complex, 8 to 15 percent slopes | 13K | Well drained | B | Very limited | Very limited |
| Tunbridge-Plaisted-Lyman complex, 15 to 25 percent slopes | 13K | Well drained | B | Very limited | Very limited |
| Bucksport muck, 0 to 2 percent slopes | 12K | Very poorly drained | B/D | Very limited | Very limited |
| Cabot silt loam, 0 to 8 percent slopes, very stony | 11K | Poorly drained | D | Very limited | Very limited |
| Peru-Marlow association, 15 to 35 percent slopes, very stony | 11K | Moderately well drained | C/D | Very limited | Very limited |
Soil Orders in This Area
The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.
What This Means
Building & Foundations
About 89% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas. A geotechnical assessment is recommended before building.
Septic Systems
About 94% 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.