Washington Well Data › Mason County
Mason County, Washington: well depth, water level & drilling cost
✓ 9,518 Ecology records · verified 2026-10-02
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How deep are wells in Mason County, Washington?
The median drilled well depth in Mason County is 117 ft, based on 9,482 wells with recorded depths in the state Ecology database. Half of all wells fall between 75 ft and 180 ft; 90% are shallower than 257 ft. Wells drilled since 2016 have a median depth of 139 ft.
How much does it cost to drill a well in Mason County?
Applying published per-foot rates to the local median depth of 139 ft: drilling and casing alone typically runs $3,475–$9,035; a complete system including pump, pressure tank, and hookup typically runs $8,340–$13,900. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Mason County?
The median static water level is 55 ft below ground surface (middle half of wells: 25 ft–110 ft), from 2,511 measurements.
How much water do wells in Mason County produce?
The median tested yield is 20 gpm (middle half: 15 gpm–30 gpm), from 1,562 pump tests. A typical household needs 5–10 gpm.
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Who drills wells in Mason 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 |
|---|---|
| Joshua Koepp | 361 |
| Rogeray Phythian | 239 |
| Emily Davis | 136 |
| Dwane Knapp | 96 |
| Christopher Jones | 67 |
| Robert Laymon | 59 |
| Cory Johnson | 54 |
| Clayton Pitts | 53 |
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Well records by ZIP code in Mason County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Shelton (98584) — 3,332 wells, median 118 ft
- Grapeview (98546) — 1,522 wells, median 101 ft
- Belfair (98528) — 1,256 wells, median 116 ft
- Allyn (98524) — 716 wells, median 123 ft
- Tahuya (98588) — 572 wells, median 163 ft
- Union (98592) — 538 wells, median 118 ft
- Hoodsport (98548) — 336 wells, median 127 ft
- Matlock (98560) — 226 wells, median 72 ft
- Lilliwaup (98555) — 115 wells, median 200 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.