Falling groundwater in Chino Valley and what it means for your well

Groundwater under the Chino Valley area has been declining for decades, with depth to water typically increasing 80 to 100 feet for a well drilled 50 years ago. Local water-advocacy groups, including the Citizens Water Advocacy Group, report declines as high as 8 feet a year in parts of Williamson Valley. Domestic wells have already gone dry on the western side of Chino Valley and along Williamson Valley Road. For a well owner this changes pump sizing, pump setting depth, and sometimes whether a pump is the right purchase at all.

The situation, in numbers

Measure	Figure
Typical increase in depth to water, well drilled 50 years ago, Chino Valley area	80 to 100 ft
Reported decline rate, parts of Williamson Valley	up to 8 ft per year
Prescott AMA overdraft, 1999	4,500 acre-feet per year
Prescott AMA overdraft, 2012	over 18,000 acre-feet per year
ADWR projected overdraft by 2025	over 20,000 acre-feet per year
Dry holes drilled by one water provider north of Prescott	5

Overdraft means more water is pumped out than goes back in. The Prescott Active Management Area was established in 1980 precisely because of long-term groundwater overdraft, and it is one of only five AMAs in Arizona.

Water levels in the Paulden area have continued a downward trend that began in the 1990s, and groundwater-level declines were widespread there through the 2010 to 2017 monitoring period.

Where it is worst

The decline is not uniform. The edges of the aquifer go first, because that is where the water column is thinnest.

Western Chino Valley. Domestic wells have gone dry on this side.

Williamson Valley Road. Advocacy groups tracking the basin put the fastest drops along its northwestern edge, out toward Granite Oaks west of Chino Valley.

Paulden. Continued decline since the 1990s, in the Big Chino subbasin.

If you are on the aquifer edge rather than over its center, your margin is smaller. That is worth knowing before you spend money on equipment.

What this does to a well, in sequence

Declining water level does not usually announce itself. It arrives as a series of symptoms that look like equipment problems.

Stage one: the well struggles under load. Water pressure falls off during irrigation or laundry, then recovers after the system rests. Easy to blame on the pump.

Stage two: air in the lines. The pump periodically draws air as the level drops to the intake during heavy use. Sputtering at the taps. See air spitting or sputtering from faucets.

Stage three: the pump runs without delivering. It cannot lift water that is no longer there. Runs continuously, builds no pressure, overheats. See pump runs constantly or short cycles.

Stage four: sand. Often after the pump has been lowered to chase the water, putting it near the sediment at the bottom of the well. See cloudy, sandy, or gritty water.

The trap at every stage is buying equipment to fix a water problem. A new pump set at the old depth reproduces the same symptoms immediately.

How to find out where you actually stand

Three measurements answer it:

Static water level. Where the water sits when the pump has been off. This is the number that matters most and the one people rarely know.

Pump setting depth. How far down your pump hangs. Should be on the drilling or service record.

Total well depth. How much room exists below the pump.

The gap between static water level and pump setting is your margin. The gap between pump setting and well bottom is your room to maneuver.

If you do not have the drilling record, Arizona Department of Water Resources maintains a registry of wells and it is worth requesting yours. Any pump contractor can measure the current static level while on site.

The options, roughly by cost

Lower the pump. Cheapest, if there is water below and space above the sediment. Buys time rather than solving anything permanently.

Add storage. A cistern lets a slow well fill a tank over hours, and the house draws from the tank. This turns a low-yield well into a workable supply and is often overlooked. It does not help a well that is genuinely dry.

Deepen the existing well. Sometimes possible depending on construction and geology.

Drill a new well. Vendor-published averages put well depths around 280 feet in Chino Valley, 300 in Prescott Valley, 320 in Prescott, and 280 to 400 feet in the Big Chino area including Paulden. Basin-fill drilling costs commonly run $30 to $60 per foot. Note that new exempt wells in the Prescott AMA require careful review.

Haul water. The fallback, and a real one locally. In March 2025, ABC15 reported that a provider north of Prescott had drilled five essentially dry holes and was trucking water in.

Where these numbers come from

The “80 to 100 feet” figure and the record of wells going dry on the western side of Chino Valley and along Williamson Valley Road come from the local water-resource record for the Prescott Active Management Area.

Three sharper claims on this page come from somewhere else: the declines as high as 8 feet a year in parts of Williamson Valley, the fastest drops out toward Granite Oaks, and the projection that the deepest wells in the Little Chino aquifer could be dry before 2050. Those are published by local water-advocacy groups, chiefly the Citizens Water Advocacy Group and the Williamson Valley Community Organization. They are not Arizona Department of Water Resources or USGS measurements, and some of the underlying material dates from the 2010s.

We publish them because they match what well owners here describe, and because the direction is not in dispute. Treat them as a direction of travel. The number that decides anything about your own well is the gap between your static water level and your pump setting, and that one you can measure.

What to ask a contractor

• What is my current static water level, measured today?
• How does that compare with my pump setting depth?
• How much room is there between my pump and the bottom of the well?
• If you are recommending a new pump, is it sized for today’s water level or the original one?
• If the level keeps dropping at the current rate, how long does this fix last?

That last question separates people selling equipment from people solving a problem.

Before you buy a property on a well here

Get the drilling record, a current static water level, and a flow test during the inspection period. A well that produced adequately in 1995 is not evidence about today, and this is not a region where that assumption is safe.

Sources

• Citizens Water Advocacy Group, on Little Chino aquifer pumping, overdraft figures, and threats to family wells
• USGS aquifer storage change monitoring, Big Chino subbasin, Yavapai County
• ABC15 and CNN affiliate reporting, March 2025, on the community north of Prescott hauling water after five dry holes
• Williamson Valley Community Organization, on local water levels
• Arizona Department of Water Resources, on the Prescott Active Management Area
• Vendor-published well depth and drilling cost averages, treated as general ranges rather than survey data

Last reviewed July 2026.