Washington Water Well
Drilling Cost
The average residential well in Washington is 185 feet deep and costs $7,770 in 2026. Drilling rates range from $28 to $65 per foot, with total project costs varying based on depth, geology, and pump system.
Avg. Well Depth
185 ft
Cost / Foot
$28–$65
Total Project
$7,770
vs. National
Near average
Washington Well Drilling Cost by Depth
| Well Depth | Drilling Only | Complete System | Est. Total |
|---|---|---|---|
| 100 ft | $2,800–$6,500 | $7,600–$11,300 | $9,000 |
| 150 ft | $4,200–$9,750 | $9,400–$14,950 | $11,500 |
| 200 ft | $5,600–$13,000 | $11,200–$18,600 | $14,000 |
| 300 ft | $8,400–$19,500 | $14,800–$25,900 | $19,000 |
| 400 ft | $11,200–$26,000 | $18,400–$33,200 | $24,000 |
| 500 ft | $14,000–$32,500 | $22,000–$40,500 | $29,000 |
*Drilling only = drilling labor per foot. Complete system includes casing, pump, pressure tank, electrical, and permits. Costs are Washington estimates for 2026.
Washington Well System Component Costs
| Service | Low | High | Average |
|---|---|---|---|
| Well Casing — PVC (185 ft) | $1,110 | $2,035 | $1,480 |
| Well Casing — Steel (185 ft) | $5,550 | $24,050 | $12,025 |
| Submersible Pump | $300 | $2,000 | $1,000 |
| Pressure Tank | $500 | $2,000 | $1,100 |
| Electrical Hookup | $1,000 | $3,000 | $1,800 |
| Permits | $200 | $500 | Varies |
| Water Quality Testing | $50 | $500 | $200 |
*Component costs based on Washington average well depth of 185 ft. Steel casing is typically required for bedrock wells; PVC is used in unconsolidated formations.
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Itemized Cost Estimate
This estimate is 91% above the Washington average of $7,770
Estimates are approximate. Actual costs depend on site conditions and contractor pricing.
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Washington Geology & Aquifers
Western Washington has thick glacial deposits and volcanic rock from the Cascade Range, while eastern Washington's Columbia Plateau features massive Columbia River Basalt flows interbedded with sedimentary interbeds that form productive but deep aquifers. The Puget Sound lowland has complex glacial stratigraphy with confined aquifer systems.
Understanding your local geology is important because rock type directly affects drilling cost. Hard crystalline rock (granite, gneiss) costs more to penetrate than soft sedimentary formations (sandstone, limestone) or unconsolidated deposits (sand, gravel). Your well driller can estimate costs based on nearby well logs.
Primary Aquifer
Columbia River Basalt Group Aquifer / Puget Sound Glacial Aquifers / Spokane Valley-Rathdrum Prairie Aquifer
Water table depth: 20-100 feet in Puget Sound lowlands; 100-400 feet in Columbia Plateau basalt; variable in the Cascades
Best Drilling Season
April through October west of the Cascades; March through November in eastern Washington; heavy rain limits winter access in western Washington
Population on well water: About 22% of Washington households use private wells, with concentrations in rural Whatcom, Thurston, and Kitsap counties and eastern Washington's agricultural areas
Why Well Depth Varies in Washington
Wells in Washington range from 40 to 600 feet deep. The wide range is driven by regional differences in geology, water table depth, and aquifer type. A well in one part of the state may cost significantly more or less than another area just 50 miles away.
40 ft
Shallowest typical wells
Usually in areas with high water tables, sandy soils, or alluvial aquifers near rivers
185 ft
State average depth
Typical residential well for most Washington locations
600 ft
Deepest typical wells
Usually in arid areas, mountain terrain, or where shallow aquifers are depleted
Washington Well Drilling Permits & Regulations
Washington requires all water well operators to be licensed by the Department of Ecology. The program includes examinations on drilling methods, geology, and water law. Separate license categories exist for resource protection wells. No homeowner exemption.
Permit Authority
- Authority
- Washington Department of Ecology; all wells require a well construction permit (Notice of Intent) and must be drilled by a licensed driller
- Permit Cost
- $200-$500
Water Rights
- Doctrine
- Prior Appropriation; permit-exempt domestic wells are limited to 5,000 gallons per day for indoor domestic use (recent legislative changes have further restricted exempt well drilling in some watersheds)
Well Water Quality in Washington
Well water quality in Washington varies by location and aquifer type. Testing your water at least annually is recommended, and a comprehensive test should be done before using a new well.
Common Water Quality Issues
arsenic
Treatment: reverse osmosis or adsorption media filter
nitrate
Treatment: reverse osmosis or ion exchange system
iron
Treatment: iron filter or oxidation system
manganese
Treatment: oxidation filter or greensand system
PFAS near military bases
Treatment: appropriate treatment system
uranium in some granitic areas
Treatment: reverse osmosis or ion exchange system
Testing Recommendations
- Before first use: Full panel including bacteria, nitrates, pH, and state-specific contaminants ($150–$500)
- Annually: Bacteria (coliform) and nitrate testing at minimum ($50–$100)
- After flooding or repairs: Bacteria test to confirm well integrity ($25–$50)
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Well Drilling Costs by City in Washington
Well drilling costs vary by location within Washington. Select a city for local pricing details.
Seattle
WA
Spokane
WA
Tacoma
WA
Olympia
WA
Vancouver
WA
+ 5 more cities in Washington. View all
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