Washington Well Data › San Juan County
San Juan County, Washington: well depth, water level & drilling cost
✓ 5,377 Ecology records · verified 2026-10-02
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How deep are wells in San Juan County, Washington?
The median drilled well depth in San Juan County is 280 ft, based on 5,329 wells with recorded depths in the state Ecology database. Half of all wells fall between 160 ft and 405 ft; 90% are shallower than 540 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 32 ft below ground surface (middle half of wells: 16 ft–80 ft), from 438 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.
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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Well records by ZIP code in San Juan County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Friday Harbor (98250) — 1,916 wells, median 320 ft
- Lopez Island (98261) — 1,119 wells, median 165 ft
- Eastsound (98245) — 690 wells, median 260 ft
- Orcas (98280) — 433 wells, median 340 ft
- Shaw Island (98286) — 311 wells, median 300 ft
- Deer Harbor (98243) — 283 wells, median 265 ft
- Olga (98279) — 253 wells, median 360 ft
- Waldron (98297) — 209 wells, median 203 ft
- Blakely Island (98222) — 83 wells, median 106 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.