Mount Rainier National Park, Washington
The dominant drainage class is Well drained and the dominant hydrologic group is A (high infiltration, low runoff). This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Mount Rainier National Park, Washington.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Glaciers-Rock outcrop complex, 15 to 100 percent slopes | 28K | Very limited | Very limited | ||
| Longmire-Arahustan complex, 35 to 100 percent slopes | 23K | Well drained | A | Very limited | Very limited |
| Tipsoo-Owyhigh complex, 35 to 100 percent slopes | 21K | Well drained | A | Very limited | Very limited |
| Longmire-Arahustan-Vantrump complex, 20 to 65 percent slopes | 11K | Well drained | A | Very limited | Very limited |
| Sluiskin-Owyhigh-Summerland complex, 25 to 100 percent slopes | 11K | Well drained | D | Very limited | Very limited |
| Rubbleland, talus-Rock outcrop complex, 15 to 100 percent slopes | 9K | Somewhat excessively drained | Very limited | Very limited | |
| Tipsoo-Owyhigh-Mysticlake complex, 20 to 65 percent slopes | 9K | Well drained | A | Very limited | Very limited |
| Burroughs-Littletahoma-Tatoosh complex, 15 to 100 percent slopes | 8K | Well drained | A | Very limited | Very limited |
| Longmire-Laughingwater-Vantrump complex, 5 to 65 percent slopes | 7K | Well drained | A/D | Very limited | Very limited |
| Owyhigh-Ipsut-Tipsoo complex, 25 to 100 percent slopes | 7K | Well drained | A | Very limited | Very limited |
| Chenuis-Sarvant complex, 25 to 100 percent slopes | 6K | Well drained | A | Very limited | Very limited |
| Tipsoo-Unicornpeak-Mysticlake complex, 10 to 55 percent slopes | 6K | Well drained | A/D | Very limited | Very limited |
| Sarvant-Chenuis-Tatoosh complex, 20 to 100 percent slopes | 6K | Well drained | A | Very limited | Very limited |
| Summerland-Tipsoo complex, 15 to 100 percent slopes | 5K | Well drained | A | Very limited | Very limited |
| Owyhigh-Tipsoo-Ipsut complex, 15 to 65 percent slopes | 5K | Well drained | A | Very limited | Very limited |
| Longmire-Arahustan-Ohanapecosh complex, 15 to 65 percent slopes | 4K | Well drained | A | Very limited | Very limited |
| Flett-Narada complex, 0 to 25 percent slopes | 4K | Somewhat excessively drained | A | Very limited | Very limited |
| Sarvant-Wahpenayo-Mountwow complex, 15 to 100 percent slopes | 4K | Well drained | A | Very limited | Very limited |
| Rubbleland, till-Glacierisland-Wonderland complex, 15 to 100 percent slopes | 4K | Somewhat excessively drained | Very limited | Very limited | |
| Ohanapecosh-Arahustan-Summerland complex, 20 to 100 percent slopes | 4K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 100% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 100% of soils are rated "very limited" for septic absorption fields. Despite good drainage overall, limitations may stem from shallow bedrock, steep slopes, or seasonal conditions. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.