⟁ Washington Well Data field records · 2026 survey

Washington Well Data › Douglas County › Rock Island (98850)

Rock Island, WA (98850): well depth, water level & drilling cost

✓ 207 Ecology records · Douglas County

120 ftmedian well depth
60 ft–290 fttypical depth range
63 ftmedian static water level
38 gpmmedian yield (42 tests)

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How deep are wells in and around Rock Island (98850), Washington?

The median drilled well depth in and around Rock Island (98850) is 120 ft, based on 207 wells with recorded depths in the state Ecology database. Half fall between 60 ft and 290 ft; 90% are shallower than 419 ft.

How much does it cost to drill a well in and around Rock Island (98850)?

Applying published per-foot rates to the local median depth of 120 ft: drilling and casing alone typically runs $3,000–$7,800; a complete system including pump, pressure tank, and hookup typically runs $7,200–$12,000. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around Rock Island (98850)?

The median static water level is 63 ft below ground surface (middle half of wells: 31 ft–218 ft), from 44 measurements.

Drilled depth distribution

0–50 ft 20 50–100 ft 74 100–150 ft 22 150–200 ft 19 200–300 ft 26 300–400 ft 22 400–600 ft 18 600+ ft 6
Looking at a specific property in Rock Island (98850)?

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Part of Douglas County well records.

Method: medians computed from Ecology records (water wells only — soil/environmental borings and decommissions excluded; depths 0–5,000 ft), grouped by ZIP from the recorded address. Cost estimate applies published per-foot ranges to the local median depth — full methodology & sources.