⟁ Washington Well Data field records · 2026 survey

Washington Well Data › Jefferson County › Brinnon (98320)

Brinnon, WA (98320): well depth, water level & drilling cost

✓ 645 Ecology records · Jefferson County

150 ftmedian well depth
67 ft–260 fttypical depth range
28 ftmedian static water level
15 gpmmedian yield (35 tests)

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How deep are wells in and around Brinnon (98320), Washington?

The median drilled well depth in and around Brinnon (98320) is 150 ft, based on 643 wells with recorded depths in the state Ecology database. Half fall between 67 ft and 260 ft; 90% are shallower than 382 ft.

How much does it cost to drill a well in and around Brinnon (98320)?

Applying published per-foot rates to the local median depth of 150 ft: drilling and casing alone typically runs $3,750–$9,750; a complete system including pump, pressure tank, and hookup typically runs $9,000–$15,000. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around Brinnon (98320)?

The median static water level is 28 ft below ground surface (middle half of wells: 10 ft–58 ft), from 171 measurements.

Drilled depth distribution

0–50 ft 102 50–100 ft 138 100–150 ft 80 150–200 ft 71 200–300 ft 125 300–400 ft 67 400–600 ft 56 600+ ft 4
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Part of Jefferson 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.