Washington Well Data › Thurston County
Thurston County, Washington: well depth, water level & drilling cost
✓ 16,588 Ecology records · verified 2026-10-02
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How deep are wells in Thurston County, Washington?
The median drilled well depth in Thurston County is 94 ft, based on 16,523 wells with recorded depths in the state Ecology database. Half of all wells fall between 62 ft and 139 ft; 90% are shallower than 222 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 40 ft below ground surface (middle half of wells: 21 ft–72 ft), from 3,786 measurements.
How much water do wells in Thurston County produce?
The median tested yield is 20 gpm (middle half: 15 gpm–40 gpm), from 1,949 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 | 112 |
| 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.
- Rochester (98579) — 2,362 wells, median 66 ft
- Yelm (98597) — 1,718 wells, median 100 ft
- Olympia (98506) — 1,618 wells, median 99 ft
- Olympia (98502) — 1,520 wells, median 120 ft
- Tenino (98589) — 1,350 wells, median 83 ft
- Rainier (98576) — 1,277 wells, median 143 ft
- Olympia (98501) — 1,072 wells, median 84 ft
- Olympia (98512) — 1,027 wells, median 80 ft
- Olympia (98505) — 870 wells, median 109 ft
- Olympia (98516) — 815 wells, median 111 ft
- Littlerock (98556) — 726 wells, median 94 ft
- Olympia (98513) — 564 wells, median 106 ft
- Tumwater (98511) — 420 wells, median 87 ft
- Bucoda (98530) — 295 wells, median 60 ft
- Lacey (98503) — 278 wells, median 98 ft
- Lacey (98509) — 192 wells, median 133 ft
- Olympia (98504) — 171 wells, median 80 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.