Deepest Wells in the Country
Arizona Well Drilling Cost
Arizona has the highest median residential well cost in the United States. Total installed $20,000 to $50,000. Three drivers: the deepest residential water tables in the country (500 to 800 ft typical, 1,000+ in some areas), full-length casing required in alluvial sediments, and the ADWR Active Management Area regulatory framework. Last verified April 2026.
Total installed range
$20K-$50K
$60K+ for deep AMA wells
Typical depth
500-800 ft
deepest in the country
Exempt well limit
35 gpm
in AMA zones
Why Arizona is the most expensive state to drill
One factor dominates: depth. Arizona residential wells are deeper than wells in any other state because the water tables in the heavily-developed central basins have been dropping for decades. The Salt River Valley alluvial aquifer that supplied Phoenix at 100 to 200 feet in 1950 sits at 500 to 700 feet today. The Pinal basin has dropped further still. The Santa Cruz Valley near Tucson has dropped 150 to 250 feet since the 1960s. Each foot of additional depth adds drilling time, casing material, pump HP and drop pipe; the cumulative cost across 400 to 500 extra feet of bore compared to a typical eastern state is substantial.
The geology compounds the depth problem. Arizona alluvial basins are filled with unconsolidated to partially-consolidated sediment that requires casing for the full depth of the bore. A 600-foot Arizona well in alluvium needs 600 feet of casing; a 600-foot hard-rock well in New Hampshire needs only 60 to 80 feet of casing. The casing-cost differential alone adds $8,000 to $15,000 to an Arizona well compared to an equivalent-depth hard-rock well in New England.
The regulatory environment adds a third layer. ADWR Active Management Areas require permits before drilling, with engineering analysis showing the new well will not interfere with existing wells, and (for non-exempt wells over 35 gpm) substantial water-rights documentation. The permit process and engineering fees alone add $2,000 to $10,000 to a typical AMA-zone residential well. Outside the AMAs (most of the state by area but a small share of population), regulation is lighter but the geological and depth factors still apply.
Cost by Arizona region
Phoenix Active Management Area (Maricopa County and adjoining). The most-populous AMA and the most-regulated. Residential well depths 500 to 800 feet typical. Per-foot drilling rates $48 to $62. Total installed cost $35,000 to $60,000 for a typical residential well meeting AMA exempt-well requirements. Wells over 35 gpm require Withdrawal Permit with substantial engineering and water-rights work.
Tucson Active Management Area (Pima County, parts of Pinal). Similar to Phoenix but slightly less aggressive water-table decline historically. Residential well depths 400 to 700 feet. Per-foot rates $45 to $58. Total installed $30,000 to $55,000.
Pinal Active Management Area (Pinal County agricultural areas). The most-affected AMA by recent water-table decline. Residential wells routinely 700 to 1,000 feet. Per-foot rates $50 to $65. Total installed cost $45,000 to $75,000. Some sub-basins have reached effective build-out where new well construction is no longer practical.
Prescott AMA. Smaller AMA covering parts of Yavapai County. Different geology (granite and metamorphic bedrock rather than alluvial basin). Residential well depths 300 to 600 feet. Per-foot rates $48 to $60. Total installed $20,000 to $40,000.
Santa Cruz AMA. Small AMA in the Santa Cruz River valley near Nogales. Mixed geology. Residential depths 300 to 600 feet. Total installed $20,000 to $35,000.
Northern Arizona (Coconino, Mohave, Navajo, Apache counties). Outside the AMAs. Mixed geology: sandstone, basalt, alluvial valleys. Depths 300 to 700 feet, less affected by recent water-table decline. Per-foot rates $40 to $55. Total installed $18,000 to $35,000. Easier permitting outside AMA zones.
Southeastern Arizona (Cochise, Graham, Greenlee counties). Outside AMAs but with declining water tables in some basins (Willcox, Sulphur Springs). Depths 400 to 800 feet. Per-foot rates $42 to $55. Total installed $25,000 to $45,000.
Cost breakdown for a representative Phoenix AMA well
Take a 600-foot 8-inch residential well in northern Pinal County (within the Phoenix AMA), drilled through 60 feet of caliche-cemented alluvium and 540 feet of basin-fill sediment to reach a productive zone at 500 to 600 feet. Eight-inch steel casing is set the full 600 feet (full-bore casing in unconsolidated sediment). Stainless steel well screen across 80 feet of productive zone. A 3 HP submersible pump set at 580 feet.
Line items at 2026 rates. Mobilisation $1,800. Drilling 600 feet at 12 inches through alluvium and basin-fill at $52 per foot ($31,200). Eight-inch steel casing 520 feet at $24 per foot ($12,480). Stainless steel well screen 80 feet at $80 per foot ($6,400). Gravel pack 80 feet, $3,500. Cement grouting 80 feet, $1,500. Sanitary well cap $500. Development 16 hours, $2,400. Submersible pump 3 HP, $3,500. Galvanized drop pipe 580 feet at $5 per foot ($2,900). Submersible cable 580 feet (8 AWG) $2,000. Pressure tank 86 gallon, $1,200. Well house with concrete pad and electrical, $4,500. Trench from well house to residence 200 feet, $800. ADWR exempt-well permit, county permit, water-quality testing $1,500. Subtotal: $76,180. With 10 percent contingency, $83,798.
That is a typical Phoenix-AMA residential bid. A simpler scope or shallower well in the same area could run $50,000 to $65,000. A more demanding scope (deeper, non-exempt with full water-rights work, larger pump) could run $100,000 or more. The Arizona-specific cost premium over comparable wells in eastern states is substantial: a similar-spec 600-foot well in Pennsylvania bedrock would run $25,000 to $35,000, less than half the Arizona AMA cost.
ADWR permitting in AMA zones
New wells in Active Management Areas require an ADWR permit before drilling begins. For most residential applications under 35 gpm, this is an "exempt well notice of intent" filing which is administratively straightforward but still mandatory. For wells over 35 gpm, the process is a full Withdrawal Permit application with substantial documentation.
Exempt well notice (under 35 gpm). Filed online via the ADWR portal. Fee $150 to $400. Processing typically 2 to 6 weeks. Requires owner information, lot description, intended use, anticipated pumping rate and depth. Once approved, the well must be drilled by an ADWR-licensed driller, and the driller files a well registration and completion report after drilling. For most residential homeowners, this is the only ADWR interaction.
Withdrawal Permit (over 35 gpm). Full ADWR review including hydrogeological analysis, neighbour notification, sometimes public hearing. Permit fee $500 to $5,000+ depending on scope. Engineering, hydrogeological consulting and water-rights legal work add $5,000 to $25,000. Processing 6 to 18 months. Most homeowners avoid this by designing the well to stay below 35 gpm.
Counties outside AMAs. Standard well-construction reporting through ADWR but no permit-prior-to-drilling requirement. County-level requirements vary; some require a notice-of-intent or building-permit-equivalent for new wells.
Decommissioning of old wells. ADWR requires that abandoned wells be properly decommissioned (plugged with cement to specified depths). Decommissioning cost $1,000 to $3,000 per well, often combined with new-well installation cost. Failure to decommission an old well can incur enforcement action and complicates property sale.
The cistern, hauling and shared-well alternatives
At Arizona's cost levels, the alternatives to drilling a new well are worth considering carefully for lots that have not yet committed to a drilled supply. Each option has trade-offs that may suit specific situations.
Storage cistern with delivered water. A 5,000 to 10,000 gallon cistern installed costs $8,000 to $20,000. Hauled water at $200 to $350 per 1,000 gallons delivered, with refills every 14 to 28 days for a typical household, runs $3,000 to $6,500 per year. Over 30 years, $90,000 to $200,000 in operating cost on top of the install. A typical Phoenix AMA well at $60,000 installed plus $1,000 per year operating cost is about $90,000 over 30 years. Comparable over the full lifecycle; cisterns offer lower up-front cost and no risk of a dry hole.
Shared well with neighbours. Where a neighbouring property has a productive well within 1,000 feet, a shared-well agreement plus a service line ($5,000 to $20,000 for trench, pipe and metering) can avoid drilling entirely. The legal complications (water-rights, maintenance liability, easement, sale provisions) require a real-estate attorney. Common arrangement in established rural Arizona neighbourhoods.
Municipal water connection. Where available, almost always the right answer. Connection fees in central Arizona run $5,000 to $20,000; monthly fees $40 to $120. The blocking issue is geographic availability: in the rural AMA areas where 800-foot wells are routine, municipal water is rarely available at any price.
Cross-references and related pages
For per-foot drilling rates, well drilling cost per foot 2026. For deep-well economics, 600-foot well drilling cost and 800-foot well drilling cost. For comparison with California (the other deep-water western state), California well drilling cost. For comparison with the cheapest state, Florida well drilling cost. For casing-cost detail that dominates Arizona alluvial deep wells, well casing cost. For commercial-application wells, commercial water well cost.
Common questions about Arizona well drilling
How much does it cost to drill a well in Arizona in 2026?
Arizona well drilling costs $20,000 to $50,000 installed in 2026, the highest median cost in the country. Most residential wells in central Arizona run 500 to 800 feet deep because of decades of water-table decline; deep wells in the south-central basins can reach 1,000 feet or more. Per-foot drilling rates $45 to $65; the deep depth combined with full-length casing in alluvial sediments drives total project cost into the $35,000 to $50,000 range routinely.
What is an Active Management Area and why does it matter?
Active Management Areas (AMAs) are zones designated by Arizona Department of Water Resources (ADWR) where groundwater is regulated to address overdraft. Five AMAs exist: Phoenix, Tucson, Pinal, Prescott and Santa Cruz. New wells inside an AMA must demonstrate they will not interfere with existing wells, may be subject to pumping caps, and require an ADWR permit beyond the standard county process. Outside the AMAs, wells are less regulated but still require state-licensed driller and standard well-construction reporting.
What is the Arizona exempt well threshold?
Within AMAs, wells pumping less than 35 gallons per minute are classified as exempt wells and are not subject to the same allocation-and-permit process as larger wells. Most residential wells are exempt by default. Above 35 gpm, the well is non-exempt and requires a Withdrawal Permit with full ADWR review, water-rights analysis, and (often) impact studies on neighbouring wells. The 35 gpm threshold drives many residential well designs to deliberately keep maximum pumping rate at 30 to 34 gpm to stay exempt.
Why are Arizona wells so deep?
Six decades of groundwater pumping that has exceeded natural recharge. ADWR water-level network data shows the central Arizona basins have dropped 100 to 300 feet over the past 50 years. The Salt River Valley alluvial aquifer that supplied Phoenix-area homes at 100 to 200 feet in 1950 now requires 500 to 800 feet to reach productive water in many areas. The Pinal Active Management Area is the most-publicised case: residential wells that completed at 300 to 400 feet in the 1970s now need 700 to 1,000 feet, and some areas have reached the point where new well construction is not practical.
Can I still drill a residential well in central Arizona?
Yes, in most areas, but with caveats. ADWR permit required for wells in AMA zones (typically 6 to 12 month timeline). Most areas allow new exempt wells (under 35 gpm) for single-family residential use. Some sub-basins of the Pinal AMA have reached effective build-out for new wells because water levels are at or below the practical drilling depth. Always check with ADWR before lot purchase if water supply is critical: a lot with no realistic well option in central Arizona is a major value-affecting issue.