Research · updated 2026-08-20 · download the county-level CSV
Arizona Well Depth & Drilling Cost Index
Drilling a private water well in Arizona means paying by the foot — so the two questions every well owner asks are how deep and how much. We computed both for all 15 counties with enough records to be reliable, from 188,924 official ADWR well records.
Statewide, the median well reaches 290 ft, and a complete system — drilling, casing, pump, pressure tank, and hookup — typically runs $24,000–$40,000. But the county spread is large:
Deepest counties to drill in Arizona
| County | Median depth | Typical depth range | Complete system |
|---|---|---|---|
| Pinal | 500 ft | 260 ft–740 ft | $36,000–$60,000 |
| Maricopa | 340 ft | 180 ft–600 ft | $19,200–$32,000 |
| Navajo | 340 ft | 200 ft–450 ft | $19,200–$32,000 |
| Pima | 335 ft | 190 ft–500 ft | $30,000–$50,000 |
| Cochise | 300 ft | 155 ft–500 ft | $36,360–$60,600 |
Most expensive counties to drill in Arizona
| County | Complete system | Drilling & casing only | Median depth |
|---|---|---|---|
| Cochise | $36,360–$60,600 | $15,150–$39,390 | 300 ft |
| Pinal | $36,000–$60,000 | $15,000–$39,000 | 500 ft |
| Pima | $30,000–$50,000 | $12,500–$32,500 | 335 ft |
| Greenlee | $27,720–$46,200 | $11,550–$30,030 | 144 ft |
| Yavapai | $25,800–$43,000 | $10,750–$27,950 | 300 ft |
Download the full county table (CSV)
How to read this
- Depth is measured; cost is modeled. Depths are the median of recorded drilled depths per county. Cost applies published Arizona per-foot drilling rates to that local median depth — a planning estimate, not a quote. Actual bids vary with geology, casing, site access, and water depth.
- Counties below 30 records are excluded so a thin sample can't produce a misleading superlative.
- Records are drilling events from the state database, which include some replacement and abandoned wells; deeper counties reflect real local geology (bedrock, aquifer depth).
Sources & methodology
- Arizona well records: ADWR (refreshed weekly; see our general methodology).
- Percentiles (p25/median/p75) computed per county; cost from published per-foot rate ranges applied to the local median depth.
The county table is free to use with attribution to Arizona Well Data (arizonawelldata.com). For a specific county, a custom cut, or the underlying records, email — usually same-day.
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