Soil series profile
Bernardston soil series
Bernardston is a well drained soil with a gravelly silt loam surface, mapped on 215,810 acres in 13 counties across 4 states. Hydrologic group C/D.
- Drainage class
- Well drained 97% of mapped acres
- Hydrologic group
- C/D 40% of mapped acres
- Typical topsoil pH
- 5.3 strongly acidic · range 5.3–5.3
- Mapped area
- 216k acres in 13 counties, 4 states
Typical Bernardston profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–8 in (H1) | Gravelly silt loam | 5.3 | 12% | 32% | 3.5% |
| 8–30 in (H2) | Gravelly loam | 5.3 | 12% | 45% | 1% |
| 30–60 in (H3) | Gravelly loam | 5.3 | 12% | 45% | 0.5% |

What this means
What Bernardston soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Bernardston soils is strongly acidic: pH 5.3. Most vegetables and lawn grasses do best around 6.0 to 7.0, so lime is often needed; blueberries, azaleas and rhododendrons like it as it is.
Loamy topsoil (loam, silt loam and similar) covers 91% of mapped Bernardston acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is gravelly silt loam (48% of mapped Bernardston acres).
97% of mapped Bernardston acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
On 91% of mapped acres, rain soaks in slowly (hydrologic groups C and D, including dual groups that are D until drained). Expect runoff and puddles after heavy rain: core-aerate compacted lawns and keep ground sloping away from foundations.
For a septic system
For conventional septic absorption fields, NRCS rates 91% of the acres in mapped Bernardston soils very limited, 0% somewhat limited and 0% not limited (9% not rated, such as urban land, pits or water).
Where the soil is very limited (slow permeability, a high water table, flooding, shallow bedrock or steep slopes), alternative systems such as mound or sand-filter designs are common and cost more.
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Bernardston soil is found
Mapped acres
Bernardston is mapped in New York, New Hampshire, Massachusetts and Connecticut.
| County | Acres | Share of county land |
|---|---|---|
| Washington County, NY | 73,255 | 13.7% |
| Rensselaer County, NY | 56,397 | 13.5% |
| Cheshire County, NH | 17,034 | 3.8% |
| Dutchess County, NY | 14,136 | 2.8% |
| Columbia County, NY | 13,729 | 3.4% |
| Grafton County, NH | 13,349 | 1.8% |
| Sullivan County, NH | 12,642 | 3.7% |
| Saratoga County, NY | 7,396 | 1.4% |
| Middlesex County, MA | 3,472 | 0.7% |
| Franklin County, MA | 2,688 | 0.6% |
| Litchfield County, CT | 1,701 | 0.3% |
| Hartford County, CT | 6 | 0.0% |
| Fairfield County, CT | 5 | 0.0% |
Septic absorption fields
NRCS rating, share of Bernardston acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 90.9% |
| Not rated | 9.1% |
Drainage, water table and flooding
Share of Bernardston acres
- Depth to seasonal high water table
- About 1.7 feet (20 in) (median where reported); within 18 inches on 6% of acres.
- Flooding
- Not mapped as flooding on most acres.
- Slope
- Typically 6–30% (median 12%).
- Topsoil organic matter
- Median 3.5%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 96.9% |
| Moderately well drained | 0.0% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
| Not rated | 3.1% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 0.0% |
| B: moderate infiltration | 0.0% |
| C: slow infiltration | 38.8% |
| D: very slow infiltration (clayey, shallow or wet) | 12.3% |
| A/D: D as is, A if drained | 0.0% |
| B/D: D as is, B if drained | 0.0% |
| C/D: D as is, C if drained | 39.8% |
| Not rated | 9.1% |
Sources & data dates
- Source
- USDA NRCS Soil Survey Geographic Database (SSURGO), queried through Soil Data Access. Public domain.
- Data date
- SSURGO as published on November 3, 2026 (most recent survey area update October 26, 2026). NRCS refreshes SSURGO each October.
- Scope
- All map unit components named Bernardston (component kind "Series") in SSURGO: 215,810 acres.
- Method
- Shares are by mapped acres of Bernardston components. The profile comes from the single largest Bernardston component. Full methodology.