Washington Well Data › Thurston County
Thurston County, Washington: well depth, water level & drilling cost
✓ 9,051 Ecology records · verified 2026-08-26
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How deep are wells in Thurston County, Washington?
The median drilled well depth in Thurston County is 100 ft, based on 8,987 wells with recorded depths in the state Ecology database. Half of all wells fall between 74 ft and 153 ft; 90% are shallower than 257 ft. Wells drilled since 2016 have a median depth of 119 ft.
How much does it cost to drill a well in Thurston County?
Applying published per-foot rates to the local median depth of 119 ft: drilling and casing alone typically runs $2,975–$7,735; a complete system including pump, pressure tank, and hookup typically runs $7,140–$11,900. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Thurston County?
The median static water level is 49 ft below ground surface (middle half of wells: 25 ft–90 ft), from 1,664 measurements.
How much water do wells in Thurston County produce?
The median tested yield is 20 gpm (middle half: 15 gpm–40 gpm), from 1,941 pump tests. A typical household needs 5–10 gpm.
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Who drills wells in Thurston 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 |
|---|---|
| Daniel Carpenter | 350 |
| Christopher Jones | 326 |
| Joshua Koepp | 169 |
| Robert Laymon | 157 |
| Jess Swanson | 111 |
| Mark Wiese | 94 |
| Rogeray Phythian | 76 |
| Michael Cyrier | 58 |
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Well records by ZIP code in Thurston County
Median depth, water level, and yield for each ZIP code with recorded wells.
- 98597 — 610 wells, median 118 ft
- 98512 — 485 wells, median 96 ft
- Rochester (98579) — 447 wells, median 79 ft
- Tenino (98589) — 398 wells, median 83 ft
- Olympia (98502) — 391 wells, median 120 ft
- Olympia (98506) — 261 wells, median 110 ft
- Olympia (98516) — 205 wells, median 122 ft
- Olympia (98501) — 199 wells, median 116 ft
- 98576 — 169 wells, median 196 ft
- Olympia (98513) — 149 wells, median 119 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.