Soil series profile
McNull soil series
McNull is a well drained soil with a loam surface, mapped on 93,256 acres in 2 counties across 2 states. Hydrologic group D.
- Drainage class
- Well drained 100% of mapped acres
- Hydrologic group
- D 98% of mapped acres
- Typical topsoil pH
- 6.3 slightly acidic · range 6.3–6.3
- Mapped area
- 93k acres in 2 counties, 2 states
Typical McNull profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–1 in (Oi) | Slightly decomposed plant material | 4.5 | 15% | 50% | 75% |
| 1–7 in (A) | Loam | 6.3 | 24% | 39% | 4.5% |
| 7–33 in (Bt) | Cobbly clay | 5.6 | 43% | 28% | 1.25% |
| 33–43 in (Crt) | Bedrock | Not reported | Not reported | Not reported | Not reported |
What this means
What McNull soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in McNull soils is slightly acidic: pH 6.3, the range most vegetables, flowers and lawn grasses prefer.
Loamy topsoil (loam, silt loam and similar) covers 98% of mapped McNull acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is loam (55% of mapped McNull acres).
100% of mapped McNull acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
On 100% 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 100% of the acres in mapped McNull soils very limited, 0% somewhat limited and 0% not 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.
Where McNull soil is found
Mapped acres
McNull is mapped in Oregon and California.
| County | Acres | Share of county land |
|---|---|---|
| Jackson County, OR | 82,294 | 6.1% |
| Siskiyou County, CA | 59 | 0.0% |
Septic absorption fields
NRCS rating, share of McNull acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 100.0% |
Drainage, water table and flooding
Share of McNull acres
- Depth to seasonal high water table
- None reported within about 6.5 feet (median where reported).
- Flooding
- Not mapped as flooding on most acres.
- Slope
- Typically 24–48% (median 31%).
- Topsoil organic matter
- Median 4.5%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 100.0% |
| Moderately well drained | 0.0% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
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 | 2.1% |
| D: very slow infiltration (clayey, shallow or wet) | 97.9% |
| 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 | 0.0% |
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 McNull (component kind "Series") in SSURGO: 93,256 acres.
- Method
- Shares are by mapped acres of McNull components. The profile comes from the single largest McNull component. Full methodology.