Washington Well Data › Grant County
Grant County, Washington: well depth, water level & drilling cost
✓ 7,911 Ecology records · verified 2026-10-02
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How deep are wells in Grant County, Washington?
The median drilled well depth in Grant County is 170 ft, based on 7,876 wells with recorded depths in the state Ecology database. Half of all wells fall between 116 ft and 260 ft; 90% are shallower than 413 ft. Wells drilled since 2016 have a median depth of 200 ft.
How much does it cost to drill a well in Grant County?
Applying published per-foot rates to the local median depth of 200 ft: drilling and casing alone typically runs $5,000–$13,000; a complete system including pump, pressure tank, and hookup typically runs $12,000–$20,000. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Grant County?
The median static water level is 80 ft below ground surface (middle half of wells: 43 ft–147 ft), from 1,672 measurements.
How much water do wells in Grant County produce?
The median tested yield is 40 gpm (middle half: 25 gpm–60 gpm), from 1,780 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in Grant 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 Eilers | 345 |
| Jose Rojas | 209 |
| Kevin Boyd | 203 |
| Salvador Valenciano | 129 |
| Alex Kerslake | 101 |
| Pedro Gama Valladares | 86 |
| Justin Pinkerton | 76 |
| Daniel Waterman | 55 |
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Well records by ZIP code in Grant County
Median depth, water level, and yield for each ZIP code with recorded wells.
- 98837 — 2,927 wells, median 160 ft
- 98823 — 1,128 wells, median 175 ft
- 98848 — 931 wells, median 160 ft
- Royal City (99357) — 610 wells, median 220 ft
- Soap Lake (98851) — 530 wells, median 175 ft
- Mattawa (99349) — 328 wells, median 140 ft
- Warden (98857) — 312 wells, median 212 ft
- George (98824) — 276 wells, median 148 ft
- Coulee City (99115) — 255 wells, median 145 ft
- Marlin (98832) — 170 wells, median 300 ft
- Beverly (99321) — 121 wells, median 145 ft
- Stratford (98853) — 98 wells, median 215 ft
- Wilson Creek (98860) — 72 wells, median 293 ft
- Vantage (98950) — 71 wells, median 200 ft
- Electric City (99123) — 64 wells, median 162 ft
- Hartline (99135) — 59 wells, median 245 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.