Washington Well Data › King County
King County, Washington: well depth, water level & drilling cost
✓ 4,737 Ecology records · verified 2026-07-28
How deep are wells in King County, Washington?
The median drilled well depth in King County is 142 ft, based on 4,686 wells with recorded depths in the state Ecology database. Half of all wells fall between 88 ft and 238 ft; 90% are shallower than 344 ft. Wells drilled since 2016 have a median depth of 157 ft.
How much does it cost to drill a well in King County?
Applying published per-foot rates to the local median depth of 157 ft: drilling and casing alone typically runs $3,925–$10,205; a complete system including pump, pressure tank, and hookup typically runs $9,420–$15,700. Actual quotes depend on site access, geology, and casing requirements.
Free for property owners. We route your request only to licensed drillers who actually file well logs in King County — never sold elsewhere.
What is the static water level in King County?
The median static water level is 76 ft below ground surface (middle half of wells: 30 ft–141 ft), from 837 measurements.
How much water do wells in King County produce?
The median tested yield is 20 gpm (middle half: 10 gpm–35 gpm), from 931 pump tests. A typical household needs 5–10 gpm.
Pull every recorded well near a King County address — $19
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See planned systems & pricing → salishwaterworks.comDrilled depth distribution
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 | 71 |
| Michael Cyrier | 69 |
| Justin Bevins | 53 |
| Aaron Ocheltree | 49 |
| Gerald Gibson | 37 |
See every driller with wells on record in King County, ranked →
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See every recorded well near any address — depths, water levels, yields, original driller's logs — in a one-time report.
Free lookup Property report — $19Well records by ZIP code in King County
Median depth, water level, and yield for each ZIP code with recorded wells.
- 98070 — 174 wells, median 181 ft
- 98022 — 169 wells, median 118 ft
- Duvall (98019) — 146 wells, median 207 ft
- Auburn (98092) — 126 wells, median 141 ft
- Maple Valley (98038) — 115 wells, median 124 ft
- Carnation (98014) — 107 wells, median 159 ft
- Issaquah (98027) — 102 wells, median 172 ft
- Ravensdale (98051) — 85 wells, median 156 ft
- North Bend (98045) — 78 wells, median 96 ft
- Redmond (98053) — 74 wells, median 183 ft
- Fall City (98024) — 72 wells, median 228 ft
- 98042 — 69 wells, median 130 ft
- 98072 — 57 wells, median 145 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.