Water Well Drilling Contractors in Oregon

Geology & Depth

Oregon's Cascade Range has volcanic basalt and andesite with highly productive but deep aquifers in fractured lava flows. The Willamette Valley has alluvial deposits over Columbia River Basalt, while eastern Oregon's high desert features Basin and Range geology with deep water tables.

Most residential wells in Oregon are drilled to 200 feet, with a typical range of 40–600 feet. Water table depth: 20-80 feet in the Willamette Valley; 100-400 feet in the Cascades basalt; 200-600 feet in eastern Oregon basins.

Permits & Licensing

Oregon requires all water well constructors to be licensed by OWRD. Separate licenses exist for drilling, pump installation, and monitoring well construction. No homeowner exemption.

Permit authority: Oregon Water Resources Department (OWRD); all wells require a start card before drilling and a well report after completion. Expect $150-$400 in permit fees.

Primary Aquifer

Columbia River Basalt Group Aquifer / Willamette Valley Alluvial Aquifers / Basin and Range Volcanic Aquifers. About 23% of Oregon households use private wells, with the highest rates in rural areas of the Willamette Valley fringe, central Oregon, and the coast.

Best drilling months: April through November west of the Cascades; May through October in eastern Oregon; heavy rains limit winter access in western Oregon.

Common Water Quality Concerns

Oregon well water commonly contains: arsenic, radon, iron, manganese, nitrate in agricultural areas, naturally elevated fluoride. A comprehensive water test after drilling (typically $150–$500) will identify which treatments, if any, your well needs.