Hawaii Water Well Depth & Drilling Cost Guide
Authoritative hydrogeological intelligence for Hawaii. Regulated by the Hawaii Commission on Water Resource Management (CWRM). The statewide median drilling depth is 310 feet (ranging 80–750 ft) with an average drilling cost of $85 per foot ($55 to $140/ft).
Quick Hydrogeological Fact Sheet: Hawaii
To reach potable water in Hawaii, residential wells require drilling an average of 310 feet deep. Total turnkey installation costs average $28,500 USD for a completed 6-inch casing well, 1.5 HP submersible pump, pressure tank, and state permits. The standing static water table sits at approximately 75 feet below surface level, producing a reliable average flow rate of 35 GPM across the primary Basal Volcanic Aquifers.
Hawaii County-Level Well Logs & Average Depths
Official USGS hydrogeological monitoring stations, static levels, and driller completion records.
| County Name | Median Depth (ft) | Avg Cost / Foot | Typical Yield | Primary Aquifer | Local Action |
|---|---|---|---|---|---|
| Hawaii County (Big Island) | 340 ft | $88 /ft | 40 GPM | Mauna Loa Basalt |
|
| Honolulu County (Oahu) | 280 ft | $82 /ft | 30 GPM | Honolulu Basal Aquifer |
💰 Estimated Turnkey Cost Itemization in Hawaii
Component-by-component breakdown for a standard residential water well (310 ft average).
| System Component | Specification in Hawaii | Unit Cost | Estimated Subtotal |
|---|---|---|---|
| Borehole Drilling & Sanitary Casing | 310 ft depth with standard 6" PVC/Steel Casing & Drive Shoe | $85 /ft | $26,350 USD |
| Submersible Pump & Drop Pipe | 1.0 HP – 1.5 HP Stainless Submersible Pump with 12-gauge electrical drop cable | Turnkey Pump Unit | $2,250 USD |
| Pressure Tank & Control Switch | 40-gallon Captive Air Pressure Tank, 40/60 PSI Pressure Switch & Gauge | Standard Assembly | $1,200 USD |
| State Permits, Sanitary Grouting & Lab Water Testing | Mandatory Hawaii Commission on Water Resource Management (CWRM) permit, bentonite surface seal, and EPA drinking panel | State Fee + Lab | $750 USD |
| TOTAL ESTIMATED TURNKEY INVESTMENT | Includes excavation, drilling, plumbing hookup, and water inspection | $28,500 USD | |
Hawaii Aquifers & Subsurface Geology
Highly permeable basalt lava flows (pahoehoe and aa), volcanic ash
Water Quality & Recommended Filtration
⚖️ Hawaii Well Drilling Regulations & Legal Setbacks
Calculate Drilling Cost in Hawaii
Pre-loaded with Hawaii median depth (310 ft) and average cost ($85/ft).
Frequently Asked Questions: Drilling Wells in Hawaii
1. How deep do you usually have to drill for water in Hawaii?
Across Hawaii, the median residential water well is drilled to 310 feet. However, shallow alluvial wells can hit water as high as 80 feet, while deep bedrock or limestone aquifer wells may require drilling down to 750 feet to reach sufficient pressure and yield.
2. How much does a complete water well cost in Hawaii?
On average, homeowners in Hawaii invest $28,500 USD for a complete turnkey system. Drilling alone costs $85 per foot (ranging $55–$140/ft), while submersible pumps, pressure tanks, state permit fees ($300), and electrical hookups comprise the remaining balance.
3. What is the required setback from septic tanks in Hawaii?
State health mandates overseen by the Hawaii Commission on Water Resource Management (CWRM) require a minimum separation distance of 100 feet from any septic tank, leach field, or potential contamination source, plus at least 25 feet from adjacent property boundaries.
4. What is the groundwater quality like in Hawaii?
Wells in Hawaii typically yield water with a hardness reading around 90 PPM and an average pH of 7.5. Key minerals present in natural groundwater include Silica, Low Hardness, Sodium Chloride near coast. The recommended standard filtration configuration is: Sediment Filtration + UV Disinfection.
🗺️ Neighboring & Regional Groundwater Guides
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