⟁ 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

✓ 208 Ecology records · Douglas County

122 ftmedian well depth
60 ft–291 fttypical depth range
58 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 122 ft, based on 208 wells with recorded depths in the state Ecology database. Half fall between 60 ft and 291 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 122 ft: drilling and casing alone typically runs $3,050–$7,930; a complete system including pump, pressure tank, and hookup typically runs $7,320–$12,200. 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 58 ft below ground surface (middle half of wells: 30 ft–198 ft), from 66 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 23 400–600 ft 18 600+ ft 6
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.