How Deep to Drill a Well in Arizona (2026): Depth by County, Aquifer + Real Data

Bottom line: Residential water wells in Arizona range from 220 feet (Safford, Graham County) to 1,000+ feet (Rio Verde Foothills, Flagstaff highlands). The statewide median is roughly 400 feet, but that single number hides a 5× difference between the shallowest and deepest parts of the state. Phoenix metro wells average 400 ft, Tucson 350 ft, Flagstaff and the Colorado Plateau 500–800 ft, and the high country around Show Low and Snowflake 320–350 ft. What determines your specific depth: which sub-basin or plateau you’re on, how much the local water table has dropped since your neighbors drilled, and whether you’re inside an Active Management Area (AMA) where ADWR data gives you a head start on estimating.

This guide pulls real well-depth data from Arizona Department of Water Resources (ADWR) records and 18 cities we cover, breaks it down by region, and explains what your depth means for the final drilling cost.

Average Well Depth in Arizona by City (2026)

The 18 Arizona cities below give a representative range across the state’s major regions — basin-and-range south, Salt River Valley, Verde Valley, Mogollon Rim, Colorado Plateau, and the eastern White Mountains.

City	County / Region	Avg Depth	Avg Total Cost
Safford	Graham (SE basin)	220 ft	$9,240
Camp Verde	Yavapai (Verde Valley)	260 ft	$11,440
Chino Valley	Yavapai (Big Chino Valley)	280 ft	$12,600
Sierra Vista	Cochise (SE basin)	280 ft	$12,600
Kingman	Mohave (Hualapai Valley)	300 ft	$13,200
Prescott Valley	Yavapai (Lonesome Valley)	300 ft	$14,100
Rimrock	Yavapai (Verde Valley)	300 ft	$13,800
Prescott	Yavapai (Prescott Active Mgmt Area)	320 ft	$15,360
Snowflake	Navajo (White Mountains)	320 ft	$14,080
Wickenburg	NW Maricopa (Hassayampa basin)	340 ft	$16,320
Globe	Gila (mountain copper country)	350 ft	$16,800
Show Low	Navajo (White Mountains plateau)	350 ft	$16,100
Tucson	Pima (Tucson AMA)	350 ft	$15,750
Mesa	Maricopa (East Salt River Valley)	380 ft	$18,240
Sedona	Yavapai (Red Rock country)	380 ft	$19,760
Payson	Gila (Mogollon Rim)	400 ft	$20,000
Phoenix	Maricopa (Salt River Valley)	400 ft	$20,000
Flagstaff	Coconino (Colorado Plateau)	500 ft	$27,500

Two takeaways: (1) the depth-to-cost relationship is strong but not 1:1 — Flagstaff at 500 ft costs more than 1.25× a Phoenix 400-ft well, because Coconino’s basalt + sandstone is harder to drill than Salt River Valley basin-fill; (2) the south-Arizona basins (Safford, Sierra Vista) are unusually shallow because Cochise and Graham sit on top of well-recharged aquifers fed by the San Pedro and Gila Rivers.

For depths beyond these median city numbers — the deeper end of Cave Creek, Carefree, Rio Verde Foothills, and the Colorado Plateau highlands — see the regional breakdown below.

Depth by Major Arizona Region

Salt River Valley (Phoenix Metro) — 350–700 ft

The Salt River Valley is a structural basin filled with thousands of feet of alluvial sediment. Three sub-basins matter for depth:

• East Salt River Valley (Mesa, Gilbert, Chandler, Apache Junction): 350–550 ft is typical. The aquifer here is the shallowest in the metro — historically the most recharge from the Salt and Gila River systems.
• West Salt River Valley (Avondale, Goodyear, Buckeye, Surprise): 450–700 ft. The West Valley has experienced the most aquifer decline in the Phoenix AMA over the past 40 years; ADWR records show drops of 200–400 feet since 1980 in many wells.
• Carefree-Cave Creek (north Scottsdale, Cave Creek, Carefree): 500–900 ft. As you move north toward the Tonto National Forest boundary, the basin-fill thins and you hit fractured granite. The transition zone often requires the well casing to be set deeper to seal off the harder rock.
• Rio Verde Foothills (NE of Scottsdale, between Carefree and the Forest boundary): 600–1,000+ ft. This is the deepest part of the Phoenix metro, and the 2023 Scottsdale water-hauling crisis that affected ~500 homes there was driven in part by ADWR-AMA rules that limited new exempt-well permits — see our Phoenix/Maricopa County well drilling cost guide for the rules in detail.

Tucson Basin / Pima County — 100–400 ft

The Tucson Basin is a deep alluvium-filled graben. Depth varies by location relative to the Santa Cruz River:

• Near the Santa Cruz River corridor (central Tucson): 100–200 ft
• East side / Pantano Wash: 200–350 ft
• Catalina Foothills / Oro Valley: 300–450 ft
• Vail / Sahuarita south of Tucson: 250–400 ft

Caliche (calcium-carbonate cemented layers) is common in the Tucson Basin and routinely slows drilling, adds 8–24 hours of bit time per layer encountered.

Colorado Plateau (Coconino, Apache, Navajo Counties) — 400–1,500 ft

The Colorado Plateau geology is fundamentally different — layered sandstone, basalt, limestone, and shale that you have to drill straight through to reach groundwater in the C-aquifer (Coconino Sandstone) or N-aquifer (Navajo Sandstone). Costs scale dramatically:

• Flagstaff: 500–800 ft typical (deep C-aquifer; some wells need to reach 1,000+ ft for adequate yield)
• Williams: 600–900 ft
• Show Low / Pinetop / Lakeside: 320–500 ft (shallower thanks to the White Mountains’ higher recharge rates)
• Page / Lake Powell area: 800–1,500 ft (N-aquifer is very deep here)
• Navajo Nation (where private wells are permitted): 600–1,500+ ft; Navajo Nation Water Code applies in addition to state rules

Hard-rock drilling on the Plateau runs $55–$95/ft vs $35–$60/ft for Phoenix-basin alluvium — a 600-ft Flagstaff well routinely runs $35,000–$50,000 complete.

Verde Valley & Prescott Region (Yavapai County) — 260–400 ft

The Verde Valley sits between the Mogollon Rim and the Bradshaw Mountains, with two main aquifers:

• Verde Valley alluvium (Camp Verde, Rimrock, Cottonwood): 260–350 ft
• Big Chino Valley (Chino Valley, Paulden): 280–400 ft
• Prescott Active Management Area (Prescott, Prescott Valley, Dewey-Humboldt): 280–450 ft

The Prescott AMA is one of only five AMAs in the state, established in 1980 due to long-term groundwater overdraft. New exempt wells in the Prescott AMA require careful review.

Hassayampa River Basin (NW Maricopa, Yavapai borderlands) — 300–700 ft

The Hassayampa runs from Yarnell south past Wickenburg into the Phoenix AMA. Well depth in this corridor:

• Yarnell / Peeples Valley: 300–500 ft
• Wickenburg: 340–600 ft
• Aguila / Wittmann (NW Valley): 400–700 ft

Southeast Arizona Basins (Cochise, Graham, Greenlee) — 150–400 ft

The Sulphur Springs Valley, San Pedro Valley, and Gila River corridor are some of Arizona’s most consistently recharged aquifers (thanks to monsoon mountain runoff from the Chiricahuas, Huachucas, and Pinaleños):

• Safford / Thatcher / Pima (Graham County): 150–280 ft
• Sierra Vista / Bisbee / Tombstone (Cochise): 200–350 ft
• Willcox (Cochise — note: in an Irrigation Non-Expansion Area): 250–500 ft

This is the most affordable part of Arizona to drill — Safford homeowners regularly drill complete wells for $9,000–$12,000, less than half the Phoenix metro average.

How to Estimate Your Specific Well Depth Before Drilling

Three sources, in order of reliability:

1. ADWR Wells 55 Database (free, most accurate). Every legally drilled well in Arizona is required to have a Driller’s Log (Form 55-55) filed with ADWR within 30 days of completion. Go to ADWR’s well registry search and search by section/township/range — pull the depth from the 5–10 closest wells. If they range from 380–520 ft, your well is almost certainly going to land in that band.

2. USGS National Water Information System. USGS monitoring wells (long-term data) tell you how the water table is moving over time. If the local monitoring well shows a 60-foot drop over the past 20 years, your well will need to be deeper than the 20-year-old wells in your ADWR query.

3. Your driller’s experience. A driller who’s worked your area for 20+ years knows which sub-basin you’re on, which formation produces the most water, and where it’s worth pushing past the first water-bearing layer to find a more productive one. This local knowledge is often more valuable than the database — a Cave Creek driller might know that wells in your specific quarter-section often need to go 60 ft below the first water strike to hit the productive zone.

The single biggest mistake homeowners make on depth: asking the driller to “stop when we hit water.” First-water on the Salt River Valley aquifer is often a thin perched layer that produces 3–5 GPM for a year and then dries up. Always drill to the deeper productive layer — costs $2,000–$5,000 more upfront and saves $15,000–$25,000 in re-drilling 5 years later.

What Depth Means for Cost

Depth and cost are tightly correlated in Arizona, but two other factors matter just as much:

Per-foot drilling rate ($28–$95/ft depending on formation):

• Basin-fill alluvium (most of Phoenix, Tucson, southern basins): $30–$60/ft
• Mixed alluvium with caliche layers (Tucson Basin, parts of West Valley): $40–$65/ft
• Fractured granite (Cave Creek, Bradshaw foothills): $50–$75/ft
• Colorado Plateau basalt/sandstone/limestone (Flagstaff, Williams): $55–$95/ft

Casing requirements. Wells deeper than ~300 ft typically require steel casing (vs PVC for shallow wells). Steel casing adds $8–$15/ft to material costs and requires a larger rig — which is why a 600-ft well doesn’t simply cost 2× a 300-ft well; it often costs 2.5–3× because of the mobilization premium for the deeper-capability rig.

Pump column length. A deeper well needs more drop pipe, more electrical cable, and a higher-horsepower pump motor. A 200-ft well’s submersible pump assembly costs $1,800–$2,800; a 600-ft well’s assembly $4,500–$7,500. Plan on this scaling into your total project cost.

For full statewide cost breakdown including AMA permitting and water-treatment requirements, see our Arizona well drilling cost guide. For Phoenix-specific sub-basin pricing, see our Phoenix & Maricopa County guide.

Common Questions About Well Depth in Arizona

Q: My neighbor drilled in 1995 to 350 ft. Will my 2026 well need to go deeper? Yes, almost certainly. ADWR records show the Phoenix AMA aquifer has dropped 3–8 ft/year in many sub-basins over the past 30 years. A 350-ft well from 1995 likely now produces from a layer that’s at 410–470 ft. Drillers price this in — plan for your new well to land at least 50–100 ft deeper than the closest 1990s neighbor.

Q: Is there a maximum depth at which it stops being economical to drill? The practical cutoff in Arizona is around 800–1,000 ft for residential use. Beyond that, the cost-per-gallon of pumped water gets so high that water-hauling, a well-share agreement, or a regional water co-op becomes more economical. This is the practical reality that forced the Rio Verde Foothills hauling solution and the EPCOR Sonoran Standpipe project.

Q: Does depth affect water quality? Often yes — but not always for the better. In the Phoenix and West Valley basins, deeper wells (>500 ft) frequently have higher arsenic, higher TDS (total dissolved solids), and more sulfide (“rotten egg” smell) than shallower wells. Plan for $3,500–$8,500 of treatment equipment on a deep Maricopa County well. In the Tucson Basin, deeper wells often have better water quality (less caliche-derived hardness).

Q: Are there parts of Arizona where wells fail to produce water entirely? Yes — parts of the Lake Mead / Lake Powell drainage in northern Mohave County, sections of the Hualapai Plateau, and some uplifted areas of the Mogollon Rim have aquifer layers that simply don’t produce. Drillers in these areas will usually quote a “drilled cost” only (you pay for the hole) with a “no-water” clause that lets you stop at a defined depth without committing to casing + completion. Always ask about no-water clauses if you’re drilling in marginal areas.

Q: How long does it take to drill a typical Arizona well? Phoenix-basin alluvium: 2–4 days for a 400–500 ft well. Cave Creek / fractured granite: 4–8 days for a 500–700 ft well. Colorado Plateau hard rock: 7–14 days for a 600–800 ft well. Add 1–3 weeks for ADWR permit approval before drilling can start inside an AMA.

Find a Licensed Arizona Driller

We list 25+ ADWR-licensed well drillers serving every region of Arizona. Enter your ZIP for a direct match with drillers familiar with your specific basin or plateau — or browse our full Arizona driller directory for state-wide options.