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How deep is the water table in Arizona?

Author

Mia Kelly

Published Jan 24, 2026

The average depth from ground surface to the water table is about 300 feet. Groundwater historically supplemented surface water because in most years, the water demand exceeded the available surface water supply.

How far down is the water table in Arizona?

State officials have estimated that in the Phoenix AMA, about 84.5 million acre-feet of groundwater exists down to a depth of 1,000 feet, though some of this water may not be recoverable.

What Year Will Arizona run out of water?

Under the first-ever federally declared water cuts, Arizona will lose 20% of its supply from the Colorado River in 2022.

How much does it cost to drill a well in Arizona?

What is the cost of drilling a water well in Arizona? The price can vary a lot, based on some of the factors we've listed, but the overall cost is likely somewhere in the range of $27 – $58 per foot.

How deep do you have to dig to reach the water table?

You will need to dig at least 30 feet below the surface to find high-quality water. But you'll need to dig even deeper to find better water that will be the safest for your family to drink. The water table rises and falls throughout the year.

27 related questions found

How deep is groundwater usually?

A: Groundwater can be anywhere from ten feet below the surface to thousands of feet below the surface. It's just a matter of where you're at geographically and the geology of the ground around you.

How far underground is an aquifer?

Aquifers occur from near-surface to deeper than 9,000 metres (30,000 ft). Those closer to the surface are not only more likely to be used for water supply and irrigation, but are also more likely to be replenished by local rainfall.

Can you dig wells in Arizona?

Prior to drilling a new well, or deepening or modifying an existing well, a Notice of Intent to Drill must be filed with ADWR. Forms are available on this site and must be submitted to ADWR accompanied by the appropriate filing fee. Authority to deepen an existing well or drill a new well will be valid for one year.

How deep should a well be for drinking water?

For drinking water wells it's best to be at least 100 feet deep so that surface contaminants cannot enter the well. The average well depth for private homes is between 100 to 800 feet [2]. You may need a deeper or shallower well if your area has different geology than another region of the country.

Does Arizona have water problems?

The megadrought that has Arizona in its tightening grip is the worst in 1200 years. Climate change is responsible for at least 40 percent of the decline in Colorado River water supplies. And the Southwest, like other desert regions, is getting steadily hotter, drier, and more dangerous.

Is Arizona in a drought 2021?

This final drought report of 2021 has the lowest severity and coverage of any report released all year! Just think, we started the year with almost all of Arizona in the top two worst drought levels: extreme and exceptional.

Where is the most water in Arizona?

More than 90 percent of our water supply is surface water that originates as snow in the mountains north and east of Phoenix. As the snow melts, it flows into reservoirs on the Colorado, Salt and Verde Rivers where it is stored for future release to our water treatment plants.

Is Arizona losing water?

More than one-third of Arizona's water flows up the Colorado River to Lake Mead. The government's declaration triggered Tier 1 water reductions, which slashed the state's river water supply by nearly 20%, or 512,000 acre-feet. One acre-foot of water supplies about two households each year.

How deep does a well need to be in AZ?

In Arizona, depth to groundwater ranges from just below land surface to more than 1,000 feet. So, when is a well considered “deep”? The most important aspect of depth is not the well's absolute depth–30 or 40 or 100 feet–but rather how far its casing extends below the water table.

How do well drillers find water?

If there are no wells in the area, or not enough information is available on existing ones, the hydrologist may contract with a well driller to put down some test holes. At these holes a pumping or aquifer test will be conducted. These tests indicate the water-bearing properties of the aquifer tapped by the well.

Is Arizona sinking?

Climate change and unregulated wells are depleting the West's groundwater reserves. Arizona is sinking. The combination of groundwater pumping and warmer temperatures is shrinking aquifers and lowering water tables. And as the land subsides, fissures open, 2-mile wounds that devour infrastructure and swallow livestock.

How far away from your house can your well be?

Some activities legally require more than a 50-foot zone of protection. As a general guidance, personal drinking water wells should have a minimum horizontal distance of at least 10 feet and preferably 25 feet from such boundaries.

Can a water well be drilled deeper?

Drilling machines can drill to great depths. Deeper wells usually cost more than a shallow well to construct in the short-run. However, not drilling deep enough can result in later problems that will be much more expensive to fix.

Can you dig a well anywhere?

The simple answer to Connie's question is yes. You probably can drill your own well on your property. You, of course, would have to contact your local building department to see if there are any regulations that must be followed.

How far do you have to drill for water in Arizona?

State law requires that “except for monitor wells and piezometer wells, no well shall be drilled within 100 feet of any septic tank system, sewage disposal area, landfill, hazardous waste facility, storage area of hazardous materials or petroleum storage areas and tanks, unless authorized in writing by the Director”.

What are the current issues with groundwater in Arizona?

Arizona's groundwater levels are plummeting in many areas. The problem is especially severe in unregulated rural areas where there are no limits on pumping. The water levels in more than 2,000 wells have dropped more than 100 feet since they were first drilled.

How deep are wells in Golden Valley AZ?

Depth to bedrock ranges from less than 400 feet to 3,200 feet below land surface. The Golden Valley subarea is located south of Chloride and covers an approximate area of 598 square miles. Depth to bedrock ranges from less than 400 feet to greater than 6,000 feet.

Is underground water everywhere?

In fact, there is a over a thousand times more water in the ground than is in all the world's rivers and lakes. Some water underlies the Earth's surface almost everywhere, beneath hills, mountains, plains, and deserts.

How deep can you find water?

Scientists on Friday said massive amounts of water appear to exist deep beneath the planet's surface, trapped in a rocky layer of the mantle at depths between 250 miles and 410 miles (410 km to 660 km). But do not expect to quench your thirst down there.

How does water get into the water table?

The Earth's surface is permeable, which means that it takes in water in like a sponge. Water gets into an aquifer from the land surface. Typically, precipitation falling onto the Earth's surface soaks into the ground and flows down to the water table.