Washington Well Drilling Cost 2026: $7,770 Avg + $28–$65/ft

Washington has dramatic regional variation in drilling conditions — from the glacial outwash of the Puget Sound area to Columbia River basalt in the arid east, the Olympic Peninsula’s fractured rock, and the volcanic Cascades. About 12% of WA households rely on private wells, mostly in rural and exurban areas. Water rights are strictly regulated here — more than almost any eastern state. Here’s what you’ll actually pay to drill a well in Washington in 2026.

Washington Well Drilling Costs at a Glance

Cost Factor	Range
Average total project cost	$7,770
Cost per foot	$28–$65
Average well depth	185 feet
Typical depth range	40–600 feet
Permit costs	$200–$500

Washington well costs are slightly below the national average, but permit costs and water-rights compliance are higher than in most states. Budget for the full regulatory process, not just drilling.

Cost Per Foot by Region

Puget Sound Region (Seattle, Tacoma, Olympia, Bellingham, Everett)

• Typical depth: 60–250 feet
• Cost per foot: $30–$50
• Geology: Glacial outwash — sand, gravel, and till

The Puget Sound lowlands have some of Washington’s easiest drilling. Productive glacial aquifers yield good-quality water at moderate depths. King, Pierce, Snohomish, and Thurston county rural wells typically run 100–200 feet. Expect $4,500–$10,000. Saltwater intrusion is a concern for wells close to Puget Sound shoreline (especially on island properties).

Columbia Basin / Eastern Washington (Yakima, Tri-Cities, Moses Lake, Pasco, Ellensburg)

• Typical depth: 100–500 feet
• Cost per foot: $35–$55
• Geology: Columbia River Basalt Group — layered volcanic basalt flows

Eastern Washington sits on one of the world’s largest basalt flow provinces. Wells tap productive interflow zones between basalt layers, but finding water can be unpredictable — some properties hit productive zones at 200 feet, others need 400+. Benton, Franklin, and Yakima county wells routinely run 200–400 feet. Expect $7,500–$18,000. Water rights are particularly contested in eastern WA — permitting adds time and cost.

Olympic Peninsula (Port Angeles, Sequim, Forks, Bremerton)

• Typical depth: 80–350 feet
• Cost per foot: $35–$60
• Geology: Glacial deposits over fractured sedimentary and metamorphic rock

The Olympic Peninsula has very variable drilling — glacial deposits in valley bottoms yield good wells, while properties in the uplands can require deep drilling into fractured rock. Clallam and Jefferson county rural wells typically run 150–300 feet. Budget $6,500–$14,000. The Sequim area has unique water rights complexity due to instream flow rules.

Spokane and NE Washington (Spokane, Colville, Deer Park, Cheney)

• Typical depth: 100–400 feet
• Cost per foot: $30–$50
• Geology: Mix of glacial outwash, granite, and sedimentary rock

Spokane metro and eastern WA drilling varies by specific location. Spokane Valley and exurbs typically have 150–300 foot wells in granite or outwash aquifers. Budget $5,500–$13,000. Water rights in the Spokane River basin are closely managed.

Cascades and Central Mountains (Leavenworth, Winthrop, Cle Elum)

• Typical depth: 150–500 feet
• Cost per foot: $40–$65
• Geology: Volcanic rock, crystalline bedrock, mountain glacial deposits

Cascade and central mountain wells have the state’s most expensive drilling — hard bedrock, steep terrain, and low yields. Budget $10,000–$22,000 for rural mountain properties. Many wells need storage tanks due to low yields.

What’s Included in the Cost

A Washington drilling quote typically covers:

• Drilling, steel or PVC casing, well screen, grouting, development, sanitary well cap
• Water Well Report filed with Ecology

Not typically included (budget separately):

Additional Cost	Price Range
Submersible pump + installation	$1,000–$2,800
Pressure tank	$400–$1,500
Electrical hookup	$500–$1,800
Water line to house	$500–$3,000
Water testing	$200–$500
Water treatment system	$1,500–$5,000
Water right application	$0–$2,000+ (if exempt well insufficient)

Washington Permits and Ecology Regulations

Washington regulates wells through the Department of Ecology (Ecology) with some of the strictest water rights enforcement in the country.

Key requirements:

• Licensed driller required — WA requires driller licensing through Ecology
• Ecology well permit — required before drilling. Fees typically $200–$500
• Water Well Report — must be filed by driller within 30 days
• Water rights — Washington requires water rights for most water use. Permit-exempt wells can use up to 5,000 gallons per day for domestic use without a separate water right — this is the practical limit for most home wells
• Minimum instream flow rules — in closed basins (especially the Columbia River basin and Puget Sound watersheds), new permit-exempt wells may be restricted or denied to protect senior water rights and fish habitat
• Setback requirements — 100 feet from septic tanks, 200 feet from some septic components, 5 feet from property lines
• Grouting — WA requires grout seal through the entire annular space of any unused casing
• Well decommissioning — old wells must be properly sealed by licensed contractors ($500–$1,500)

Important: Washington permit + water rights processing can take 6–16 weeks, especially in closed basins. The 5,000 GPD permit-exempt allowance is tight for households with gardens or livestock — if you need more, a water right application is required and may take 1–3+ years.

Check requirements with WA Department of Ecology.

Water Quality Concerns

Washington well water commonly contains:

• Arsenic — naturally occurring in many WA aquifers, particularly in volcanic areas (Columbia Basin, Cascades). Treatment: $2,000–$5,000
• Nitrate — in agricultural areas, especially Yakima Valley and Columbia Basin
• Iron and manganese — common in glacial and basalt aquifers. Iron filters: $1,200–$2,800
• Hardness — variable; often lower in basalt-aquifer wells than in sedimentary wells
• Fluoride — elevated in some Columbia Basin wells
• Bacterial contamination — a concern for shallow Puget Sound wells, especially after flooding
• Saltwater intrusion — coastal and island wells close to Puget Sound shoreline

Budget $200–$500 for comprehensive water testing — Washington requires arsenic testing for new wells, and the full panel should include nitrate, iron, manganese, and bacteria.

Best Time to Drill

• Eastern WA and Columbia Basin — year-round drilling except deep winter (occasional freezing delays)
• Western WA / Puget Sound lowlands — year-round; wet season (October–April) can delay drilling due to muddy access
• Mountains (above 3,000 ft) — May through October. Snow limits winter drilling in the Cascades and Olympic uplands
• Book 4–10 weeks ahead — WA drillers are booked out, especially in permit-rich Puget Sound counties

How to Save Money

1. Get 3+ quotes — drilling prices in WA vary 20–40% between contractors. Get free estimates from licensed WA drillers
2. Check the Ecology Well Log database — Washington’s Water Resource Inventory Areas (WRIA) have searchable well logs. Use these to estimate your likely depth
3. Verify water rights and basin closures upfront — before buying rural property, confirm whether permit-exempt wells are allowed in the basin. Some closed basins (upper Kittitas, Skagit, parts of the Columbia) restrict new wells severely
4. Stay within the 5,000 GPD exempt allowance — households with large gardens, livestock, or irrigation should size plans carefully. Going over triggers full water rights application (years and thousands of dollars)
5. Budget for arsenic treatment — Washington has elevated arsenic in many wells. Plan $2,000–$4,000 for treatment unless testing confirms low levels
6. Close on rural property after confirming water rights — include well and water rights contingency in purchase contracts for WA rural properties

Frequently Asked Questions

How deep are most wells in Washington? The state average is about 185 feet. Puget Sound lowlands wells typically run 100–200 feet. Columbia Basin wells average 200–400 feet. Olympic Peninsula wells vary 100–300 feet. Cascade and mountain wells routinely exceed 300 feet.

Do I need a permit to drill a well in Washington? Yes. Ecology requires a permit (fees $200–$500), and you need a water right or valid permit-exempt well status. Processing can take 6–16 weeks — plan well ahead.

What is a permit-exempt well in Washington? An exempt well can use up to 5,000 gallons per day for domestic use without requiring a full water right. This covers most single-family homes, but a large garden (over 1/2 acre of irrigation), livestock, or multi-family use may exceed the limit and require a water right — which is time-consuming and expensive to obtain.

Can I drill my own well in Washington? Washington requires licensed well drillers for all permitted wells. Homeowner drilling is not practical.

Why are some WA basins closed to new wells? To protect senior water rights holders and instream flows for fish. Some basins (upper Yakima, parts of the Skagit, upper Columbia tributaries) are “closed” — new permit-exempt wells may be restricted or denied during low-flow months. This can make some rural properties effectively unbuildable. Research the basin status before buying rural WA land.

Is arsenic really a big deal in Washington wells? Yes, in many areas. Basalt and volcanic aquifers in eastern WA and parts of the Cascades have elevated natural arsenic. Testing is required by Ecology for new wells. Budget $2,000–$4,000 for treatment if your well exceeds 10 ppb — the EPA limit.

Get a Washington Well Drilling Quote

Washington well drilling costs range from $4,500 for a straightforward Puget Sound lowland well to $22,000+ for a deep Cascade mountain installation. The state’s water rights complexity makes local expertise essential — hire a driller who knows your specific basin and WRIA.

Get 3 free quotes from licensed well drilling contractors in Washington, or browse our Washington contractor directory to find drillers near you.