Well pump repair in Williamson Valley

Williamson Valley sits on the northwestern margin of the basin, and domestic wells here have already gone dry. Local water-advocacy groups, including the Citizens Water Advocacy Group, report declines as high as 8 feet a year in parts of the valley and put the fastest drops out toward Granite Oaks. If you own a well here, the useful first step is measuring your static water level against your pump setting depth rather than waiting for symptoms.

Why this area is different

Everywhere in the Prescott Active Management Area is losing groundwater. Williamson Valley is losing it fastest, and it has the least to lose.

The reason is position. Toward the edges of a groundwater basin, the saturated thickness above bedrock is thinner. A three foot drop in the center of the basin is a nuisance. The same three feet at the margin can take a well out of water entirely.

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

By those groups’ reckoning, the fastest drops in the basin are along its northwestern edge, out toward Granite Oaks and west of Chino Valley. Carrying current rates forward, they project that even the deepest wells in the Little Chino aquifer could be dry before 2050. That is an advocacy-group projection rather than a state forecast, and what matters for your own well is the gap between your static water level and your pump setting.

New home building in the area combined with drought has driven levels down, making it harder to find wells that produce enough water to meet demand.

What failure looks like before it arrives

Wells rarely stop all at once. They degrade, and the early stages get misread as pump problems.

Pressure falls off under sustained use, then recovers. The well is drawing down faster than it refills. See low or dropping water pressure.

Air comes through the taps. The pump is periodically drawing air as the level reaches the intake. See air spitting or sputtering from faucets.

The pump runs and runs without building pressure. It cannot lift water that is not there. See pump runs constantly or short cycles.

Sand appears. Often after a pump has been lowered to chase the water, putting it near the sediment at the bottom. See cloudy, sandy, or gritty water.

The expensive mistake at every one of those stages is buying a pump. A new pump set at the old depth reproduces the problem the day it goes in.

The three numbers to get

Ask any contractor on site to measure and write down:

1. Static water level today. Where the water sits with the pump off.
2. Pump setting depth. How far down your pump hangs.
3. Total well depth. How much room is below the pump.

Number one minus number two is your margin. Number two minus number three is your room to lower the pump.

If you do not have the drilling record, Arizona Department of Water Resources maintains a well registry and it is worth requesting yours.

Options, roughly by cost

Lower the pump. Cheapest, if there is water below and space above the sediment layer. Buys time.

Add storage. A cistern lets a slow well fill a tank over many hours while the house draws from the tank. This is the most commonly overlooked option and often the right one out here, because it converts a low-yield well into a workable supply. It does nothing for a well that is genuinely dry.

Deepen the existing well. Depends on construction and what is underneath.

Drill new. Basin-fill drilling costs commonly run $30 to $60 per foot. Note that new exempt wells in the Prescott AMA require careful review, and the five dry holes drilled by a provider north of Prescott are a reminder that drilling here does not guarantee water.

Haul water. A real and current fallback in this area. Households here already do it.

If you are buying property here

Do all three of these during the inspection period:

• Get the drilling record
• Get a current static water level measurement
• Get a flow test

A well that produced adequately in 1998 is not evidence about today. On the aquifer margin that gap between then and now is the entire question, and it is far cheaper to answer before closing.

Next step

Describe what your well is doing, and include your static water level and pump depth if you have them. We will connect you with an independent local contractor who works on wells in the Williamson Valley area. Start here, or read falling groundwater and what it means for your well.