County soil summary
Soil types in Worcester County, Massachusetts
The most widespread soils are Paxton, Woodbridge and Canton; the most common drainage class is well drained (43% of the land), and typical topsoil pH is 5.1.
- Well or moderately well drained
- 77% of land · state 72%
- Typical topsoil pH
- 5.1 strongly acidic · state 5.0
- Septic fields very limited
- 90% of land · state 88%
- Subject to flooding
- 4% of land, any frequency · state 8%
Most common soils in Worcester County
Share of mapped land
A county is a patchwork of many soils. These 8 cover 52% of the mapped land; 72 named soil series are mapped here in all.
| Soil | Share of land | Drainage | Topsoil pH |
|---|---|---|---|
| Paxton | 15.3% | Well drained | 5.5 |
| Woodbridge | 8.3% | Moderately well drained | 5.2 |
| Canton | 6.9% | Well drained | 4.3 |
| Charlton | 5.0% | Well drained | 4.8 |
| Hinckley | 4.8% | Excessively drained | 4.6 |
| Ridgebury | 4.0% | Poorly drained | 5.5 |
| Merrimac | 3.8% | Somewhat excessively drained | 5.1 |
| Chatfield | 3.6% | Well drained | 4.2 |
What this means
What the soils in Worcester County mean for gardens, lawns and septic systems
For your garden
Typical topsoil in Worcester County is strongly acidic: pH 5.1 (most land between 4.3 and 5.5). 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 71% of the land: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is fine sandy loam (66% of the land).
77% of the land is moderately well to excessively drained, which suits most garden plants.
For your lawn and yard
On 63% of the land, 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.
A seasonal high water table comes within 18 inches of the surface on 24% of the land, often in spring. Basements, sump pumps and lawns in low spots feel it first.
For a septic system
For conventional septic absorption fields, NRCS rates 90% of the land in Worcester County very limited, 6% somewhat limited and <1% not limited (4% not rated, such as urban land, pits or water).
That is close to the state as a whole (88% very limited).
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.
Drainage
How long the soil stays wet
The most common drainage class is well drained (43%). 77% of the land is moderately well drained or better, compared with 72% across Massachusetts.
Show as a table
| Category | Worcester County | Massachusetts |
|---|---|---|
| Excessively drained | 8.0% | 13.5% |
| Somewhat excessively drained | 7.9% | 10.4% |
| Well drained | 43.3% | 32.9% |
| Moderately well drained | 17.8% | 15.1% |
| Somewhat poorly drained | 0.1% | 0.0% |
| Poorly drained | 6.5% | 7.2% |
| Very poorly drained | 10.2% | 10.6% |
| Not rated | 6.3% | 10.2% |
Septic absorption fields
NRCS rating for conventional drain fields
The rating looks at the soil from 24 to 60 inches deep: permeability, depth to a seasonal water table or bedrock, flooding and slope. “Very limited” means at least one feature is unfavorable enough that a conventional field is hard to make work.
Show as a table
| Category | Worcester County | Massachusetts |
|---|---|---|
| Not limited | 0.4% | 0.9% |
| Somewhat limited | 6.0% | 3.0% |
| Very limited | 90.0% | 87.7% |
| Not rated | 3.6% | 8.3% |
Rain, runoff and water table
Hydrologic soil group, flooding, seasonal water table
Hydrologic soil group
How fast rain soaks in when the soil is already wet. Group A soaks in fastest, D slowest.
Show as a table
| Category | Worcester County | Massachusetts |
|---|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 15.5% | 24.5% |
| B: moderate infiltration | 17.3% | 13.1% |
| C: slow infiltration | 25.6% | 16.0% |
| D: very slow infiltration (clayey, shallow or wet) | 13.4% | 16.3% |
| A/D: D as is, A if drained | 1.7% | 3.4% |
| B/D: D as is, B if drained | 7.2% | 8.0% |
| C/D: D as is, C if drained | 15.5% | 10.2% |
| Not rated | 3.9% | 8.6% |
Flooding
Show as a table
| Category | Worcester County | Massachusetts |
|---|---|---|
| No flooding | 94.5% | 87.7% |
| Rare or very rare | 2.9% | 4.5% |
| Occasional | 0.3% | 0.7% |
| Frequent or very frequent | 0.4% | 2.6% |
| Not reported | 1.8% | 4.4% |
Seasonal high water table
Show as a table
| Category | Worcester County | Massachusetts |
|---|---|---|
| Within 18 inches at some time of year | 24.3% | 24.6% |
| 18 inches to 3.3 feet | 28.7% | 19.7% |
| Deeper than 3.3 feet or none reported | 46.7% | 54.8% |
| Not reported | 0.4% | 1.0% |
Topsoil pH and texture
First mineral layer of each soil
Typical topsoil pH is 5.1 (strongly acidic); 80% of rated land falls between 4.3 and 5.5. Median topsoil organic matter is 7.8%.
Show as a table
| Category | Worcester County | Massachusetts |
|---|---|---|
| Strongly acidic (below 5.5) | 57.6% | 61.0% |
| Moderately to slightly acidic (5.5–6.4) | 25.9% | 17.6% |
| Near neutral (6.5–7.3) | 0.0% | 1.3% |
| Alkaline (7.4 and up) | 0.0% | 0.1% |
| Not reported | 16.5% | 20.0% |
Texture
Show as a table
| Category | Worcester County | Massachusetts |
|---|---|---|
| Sandy | 12.2% | 20.2% |
| Loamy (loam, silt loam and similar) | 70.5% | 58.3% |
| Clayey (40%+ clay) | 0.0% | 0.0% |
| Organic (muck or peat) | 11.1% | 10.9% |
| Not reported (rock, urban land, etc.) | 6.1% | 10.6% |
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
- Worcester County, Massachusetts (FIPS 25027): 965,882 acres of mapped land, 45,030 acres of open water excluded. State comparisons pool all mapped land in Massachusetts.
- Method
- Shares are by mapped land area: each map unit’s acres in the county times each soil component’s percentage. Open water is excluded. Topsoil values use the first mineral horizon of each component. Full methodology.