County soil summary
Soil types in Atlantic County, New Jersey
The most widespread soils are Downer, Manahawkin and Transquaking; the most common drainage class is very poorly drained (34% of the land), and typical topsoil pH is 4.8.
- Well or moderately well drained
- 43% of land · state 62%
- Typical topsoil pH
- 4.8 very strongly acidic · state 5.0
- Septic fields very limited
- 93% of land · state 90%
- Subject to flooding
- 36% of land, any frequency · state 18%
Most common soils in Atlantic County
Share of mapped land
A county is a patchwork of many soils. These 8 cover 65% of the mapped land; 45 named soil series are mapped here in all.
| Soil | Share of land | Drainage | Topsoil pH |
|---|---|---|---|
| Downer | 13.5% | Well drained | 6.3 |
| Manahawkin | 9.6% | Very poorly drained | 5.2 |
| Transquaking | 9.5% | Very poorly drained | Not reported |
| Atsion | 9.4% | Poorly drained | 3.6 |
| Mullica | 6.7% | Very poorly drained | 4.0 |
| Galloway | 6.2% | Somewhat poorly drained | 4.3 |
| Hammonton | 5.6% | Moderately well drained | 6.2 |
| Sassafras | 4.5% | Well drained | 6.0 |
What this means
What the soils in Atlantic County mean for gardens, lawns and septic systems
For your garden
Typical topsoil in Atlantic County is very strongly acidic: pH 4.8 (most land between 4.0 and 6.3). 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.
Sandy topsoil covers 46% of the land. It drains fast and warms early in spring, but dries out and loses nutrients quickly: mulch, compost and steady watering help. The most common surface texture is loamy sand (24% of the land).
51% of the land is somewhat poorly to very poorly drained, so soil stays soggy for long spells after rain and in wet seasons. Raised beds, plants that tolerate wet feet, and not working the soil while wet all help.
For your lawn and yard
On 58% 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 57% 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 93% of the land in Atlantic County very limited, <1% somewhat limited and 0% not limited (7% not rated, such as urban land, pits or water).
That is close to the state as a whole (90% 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.
Flooding is mapped on 36% of the land (1% occasional, 30% frequent).
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 very poorly drained (34%). 43% of the land is moderately well drained or better, compared with 62% across New Jersey.
Show as a table
| Category | Atlantic County | New Jersey |
|---|---|---|
| Excessively drained | 6.4% | 5.3% |
| Somewhat excessively drained | 0.4% | 4.5% |
| Well drained | 24.8% | 36.6% |
| Moderately well drained | 11.7% | 15.4% |
| Somewhat poorly drained | 6.3% | 5.9% |
| Poorly drained | 10.0% | 9.5% |
| Very poorly drained | 34.4% | 13.6% |
| Not rated | 5.9% | 9.0% |
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 | Atlantic County | New Jersey |
|---|---|---|
| Not limited | 0.0% | 1.2% |
| Somewhat limited | 0.1% | 2.9% |
| Very limited | 93.1% | 89.7% |
| Not rated | 6.8% | 6.1% |
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 | Atlantic County | New Jersey |
|---|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 26.3% | 19.9% |
| B: moderate infiltration | 14.2% | 21.5% |
| C: slow infiltration | 1.9% | 17.8% |
| D: very slow infiltration (clayey, shallow or wet) | 5.7% | 10.6% |
| A/D: D as is, A if drained | 48.5% | 15.9% |
| B/D: D as is, B if drained | 1.8% | 4.7% |
| C/D: D as is, C if drained | 0.1% | 2.8% |
| Not rated | 1.5% | 6.8% |
Flooding
Show as a table
| Category | Atlantic County | New Jersey |
|---|---|---|
| No flooding | 63.9% | 82.0% |
| Rare or very rare | 5.0% | 2.4% |
| Occasional | 1.0% | 2.1% |
| Frequent or very frequent | 30.1% | 13.4% |
| Not reported | 0.0% | 0.1% |
Seasonal high water table
Show as a table
| Category | Atlantic County | New Jersey |
|---|---|---|
| Within 18 inches at some time of year | 56.5% | 32.1% |
| 18 inches to 3.3 feet | 11.7% | 15.8% |
| Deeper than 3.3 feet or none reported | 31.8% | 52.1% |
| Not reported | 0.0% | 0.1% |
Topsoil pH and texture
First mineral layer of each soil
Typical topsoil pH is 4.8 (very strongly acidic); 80% of rated land falls between 4.0 and 6.3. Median topsoil organic matter is 2%.
Show as a table
| Category | Atlantic County | New Jersey |
|---|---|---|
| Strongly acidic (below 5.5) | 56.3% | 62.1% |
| Moderately to slightly acidic (5.5–6.4) | 25.3% | 22.5% |
| Near neutral (6.5–7.3) | 4.0% | 2.9% |
| Alkaline (7.4 and up) | 3.7% | 1.1% |
| Not reported | 10.7% | 11.4% |
Texture
Show as a table
| Category | Atlantic County | New Jersey |
|---|---|---|
| Sandy | 46.2% | 24.8% |
| Loamy (loam, silt loam and similar) | 16.5% | 53.1% |
| Clayey (40%+ clay) | 0.0% | 0.1% |
| Organic (muck or peat) | 36.3% | 13.7% |
| Not reported (rock, urban land, etc.) | 1.0% | 8.2% |
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
- Atlantic County, New Jersey (FIPS 34001): 403,378 acres of mapped land, 38,836 acres of open water excluded. State comparisons pool all mapped land in New Jersey.
- 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.