Soil series profile
Warden soil series
Warden is a well drained soil with a silt loam surface, mapped on 493,063 acres in 10 counties across 2 states. Hydrologic group B.
- Drainage class
- Well drained >99% of mapped acres
- Hydrologic group
- B >99% of mapped acres
- Typical topsoil pH
- 7.2 neutral · range 7.2–7.5
- Mapped area
- 493k acres in 10 counties, 2 states
Typical Warden profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–9 in (H1) | Silt loam | 7.2 | 12% | 21% | 2% |
| 9–19 in (H2) | Silt loam | 7.2 | 12% | 21% | 0.25% |
| 19–60 in (H3) | Stratified very fine sandy loam to silt loam | 8.2 | 12% | 21% | 0.25% |
What this means
What Warden soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Warden soils is neutral: pH 7.2 (most land between 7.2 and 7.5), the range most vegetables, flowers and lawn grasses prefer.
Loamy topsoil (loam, silt loam and similar) covers >99% of mapped Warden acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (79% of mapped Warden acres).
>99% of mapped Warden acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
Most land is in hydrologic groups B and C, where rain soaks in at a moderate pace.
For a septic system
For conventional septic absorption fields, NRCS rates 13% of the acres in mapped Warden soils very limited, 87% somewhat limited and 0% not limited.
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Warden soil is found
Mapped acres
Warden is mapped in Washington and Oregon.
| County | Acres | Share of county land |
|---|---|---|
| Benton County, WA | 172,700 | 15.7% |
| Yakima County, WA | 123,120 | 6.4% |
| Morrow County, OR | 49,410 | 4.5% |
| Grant County, WA | 44,445 | 2.7% |
| Franklin County, WA | 40,666 | 5.5% |
| Gilliam County, OR | 29,069 | 3.8% |
| Klickitat County, WA | 21,658 | 2.0% |
| Adams County, WA | 9,772 | 0.8% |
| Wasco County, OR | 2,047 | 0.2% |
| Douglas County, WA | 177 | 0.0% |
Septic absorption fields
NRCS rating, share of Warden acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 86.6% |
| Very limited | 12.9% |
| Not rated | 0.5% |
Drainage, water table and flooding
Share of Warden 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 1–20% (median 4%).
- Topsoil organic matter
- Median 2%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 99.5% |
| Moderately well drained | 0.0% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
| Not rated | 0.5% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 0.0% |
| B: moderate infiltration | 99.5% |
| C: slow infiltration | 0.0% |
| D: very slow infiltration (clayey, shallow or wet) | 0.0% |
| 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% |
| Not rated | 0.5% |
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 Warden (component kind "Series") in SSURGO: 493,063 acres.
- Method
- Shares are by mapped acres of Warden components. The profile comes from the single largest Warden component. Full methodology.