⟁ 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

✓ 64 Ecology records · Douglas County

111 ftmedian well depth
60 ft–261 fttypical depth range
61 ftmedian static water level
39 gpmmedian yield (28 tests)

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

The median drilled well depth in Rock Island (98850) is 111 ft, based on 64 wells with recorded depths in the state Ecology database. Half fall between 60 ft and 261 ft; 90% are shallower than 351 ft.

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

Applying published per-foot rates to the local median depth of 111 ft: drilling and casing alone typically runs $2,775–$7,215; a complete system including pump, pressure tank, and hookup typically runs $6,660–$11,100. Actual quotes depend on site access, geology, and casing requirements.

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

The median static water level is 61 ft below ground surface (middle half of wells: 30 ft–203 ft), from 32 measurements.

Drilled depth distribution

0–50 ft 4 50–100 ft 26 100–150 ft 9 150–200 ft 5 200–300 ft 7 300–400 ft 8 400–600 ft 2 600+ ft 3
Looking at a specific property in Rock Island (98850)?

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Get quotes from drillers who work 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.