Washington Well Data › King County
King County, Washington: well depth, water level & drilling cost
✓ 11,544 Ecology records · verified 2026-10-02
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How deep are wells in King County, Washington?
The median drilled well depth in King County is 130 ft, based on 11,492 wells with recorded depths in the state Ecology database. Half of all wells fall between 78 ft and 210 ft; 90% are shallower than 314 ft. Wells drilled since 2016 have a median depth of 155 ft.
How much does it cost to drill a well in King County?
Applying published per-foot rates to the local median depth of 155 ft: drilling and casing alone typically runs $3,875–$10,075; a complete system including pump, pressure tank, and hookup typically runs $9,300–$15,500. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in King County?
The median static water level is 74 ft below ground surface (middle half of wells: 27 ft–137 ft), from 897 measurements.
How much water do wells in King County produce?
The median tested yield is 20 gpm (middle half: 10 gpm–35 gpm), from 933 pump tests. A typical household needs 5–10 gpm.
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Who drills wells in King 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 |
|---|---|
| Pierce Kiltoff | 134 |
| Rodney Gilseth JR | 117 |
| Mark Wiese | 114 |
| Chris Gregory | 73 |
| Michael Cyrier | 69 |
| Justin Bevins | 53 |
| Aaron Ocheltree | 49 |
| Gerald Gibson | 41 |
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Well records by ZIP code in King County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Enumclaw (98022) — 942 wells, median 115 ft
- Duvall (98019) — 867 wells, median 150 ft
- Hobart (98025) — 683 wells, median 119 ft
- Maple Valley (98038) — 653 wells, median 105 ft
- Auburn (98092) — 615 wells, median 137 ft
- Woodinville (98077) — 599 wells, median 155 ft
- Ravensdale (98051) — 494 wells, median 136 ft
- Kent (98042) — 488 wells, median 116 ft
- Vashon (98070) — 468 wells, median 162 ft
- Carnation (98014) — 448 wells, median 145 ft
- Issaquah (98027) — 444 wells, median 147 ft
- Burton (98013) — 413 wells, median 168 ft
- Federal Way (98093) — 334 wells, median 110 ft
- North Bend (98045) — 333 wells, median 72 ft
- Black Diamond (98010) — 333 wells, median 116 ft
- Preston (98050) — 314 wells, median 176 ft
- Redmond (98053) — 314 wells, median 160 ft
- Snoqualmie (98065) — 313 wells, median 160 ft
- Fall City (98024) — 299 wells, median 168 ft
- Issaquah (98029) — 225 wells, median 128 ft
- Renton (98059) — 222 wells, median 180 ft
- Renton (98058) — 160 wells, median 72 ft
- Redmond (98073) — 142 wells, median 101 ft
- Kent (98031) — 138 wells, median 118 ft
- Auburn (98002) — 114 wells, median 116 ft
- Sammamish (98074) — 102 wells, median 120 ft
- Pacific (98047) — 95 wells, median 200 ft
- Bellevue (98006) — 66 wells, median 180 ft
- Skykomish (98288) — 65 wells, median 95 ft
- Seattle (98177) — 60 wells, median 218 ft
- 98052 — 59 wells, median 98 ft
- Sammamish (98075) — 59 wells, median 131 ft
- Tacoma (98407) — 56 wells, median 117 ft
- Bellevue (98008) — 52 wells, median 115 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.