Washington Well Data › San Juan County
San Juan County, Washington: well depth, water level & drilling cost
✓ 3,091 Ecology records · verified 2026-07-28
How deep are wells in San Juan County, Washington?
The median drilled well depth in San Juan County is 300 ft, based on 3,043 wells with recorded depths in the state Ecology database. Half of all wells fall between 170 ft and 460 ft; 90% are shallower than 600 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.
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What is the static water level in San Juan County?
The median static water level is 35 ft below ground surface (middle half of wells: 19 ft–80 ft), from 361 measurements.
How much water do wells in San Juan County produce?
The median tested yield is 4 gpm (middle half: 1 gpm–12 gpm), from 433 pump tests. A typical household needs 5–10 gpm.
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Drilled depth distribution
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).
| Driller | Wells since 2016 |
|---|---|
| Jimmy Mauldin | 158 |
| Alfred Mauldin | 103 |
| Mark Sawyer | 34 |
| Stanley Arnott | 33 |
| Justin Martel | 12 |
| Brent Barker | 9 |
| Robert Eagan | 8 |
| Arthur Wisehart | 4 |
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Median depth, water level, and yield for each ZIP code with recorded wells.
- Friday Harbor (98250) — 363 wells, median 345 ft
- 98245 — 248 wells, median 325 ft
- 98261 — 119 wells, median 165 ft
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.