Cascade Foothills
Cascade Foothills: Volcanic Ash and the Perched Water Table Trap Wrapping the Cascade Range from Mount Baker down to Mount St. Helens, the foothill soils tell a very different story than the glacial till of the Puget Sound lowlands. Volcanic ash and cinder deposits from thousands of years of eruptions create soil that often drains faster than its texture would suggest — which sounds like good news for a septic system, right up until it isn’t. The trap in one…