⟁ Washington Well Data field records · 2026 survey

Washington Well Data › San Juan County

San Juan County, Washington: well depth, water level & drilling cost

✓ 5,782 Ecology records · verified 2026-06-11

264 ftmedian well depth
145 ft–400 fttypical depth range
30 ftmedian static water level
3 gpmmedian yield (537 tests)

How deep are wells in San Juan County, Washington?

The median drilled well depth in San Juan County is 264 ft, based on 5,593 wells with recorded depths in the state Ecology database. Half of all wells fall between 145 ft and 400 ft; 90% are shallower than 525 ft. Wells drilled since 2016 have a median depth of 305 ft.

How much does it cost to drill a well in San Juan County?

Applying published per-foot rates to the local median depth of 305 ft: drilling and casing alone typically runs $7,625–$19,825; a complete system including pump, pressure tank, and hookup typically runs $18,300–$30,500. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in San Juan County?

The median static water level is 30 ft below ground surface (middle half of wells: 12 ft–77 ft), from 467 measurements.

How much water do wells in San Juan County produce?

The median tested yield is 3 gpm (middle half: 1 gpm–10 gpm), from 537 pump tests. A typical household needs 5–10 gpm.

Drilled depth distribution

0–50 ft 513 50–100 ft 428 100–150 ft 515 150–200 ft 496 200–300 ft 1,095 300–400 ft 977 400–600 ft 1,113 600+ ft 456

Who drills wells in San Juan County?

Licensed drillers by number of wells completed in this county since 2016, per filed well reports (license roster: Washington Department of Ecology).

DrillerWells since 2016
Jimmy Mauldin157
Alfred Mauldin103
Mark Sawyer34
Stanley Arnott33
Justin Martel12
Brent Barker9
Robert Eagan8
Arthur Wisehart4

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Method: medians computed from Ecology records (water wells only — soil/environmental borings and decommissions excluded; depths 0–5,000 ft). Cost estimate applies published per-foot ranges (checked 2026-06-11) to the local median depth — full methodology & sources.