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7 Warning Signs Your Water Well Is In Trouble

The typical modern residential well is an amazing resource and can produce many years of excellent water with minimal servicing. With most wells being able to operate for many years without maintenance, many homeowners don’t realize that their well requires service or routine maintenance until it is too late. The good news is there are some tell-tale signs to look for that may alert you to well water problems.

How A Typical Well Pump System Works

Typical residential water wells usually have a submersible pump that pumps water directly to the house.

Some wells have pumps called “jet pumps” that are located on the surface or top of the well. Most well pumps are used in conjunction with a pressure tank.

The goal of the well water pump system is to maintain a constant supply of pressurized water in the house and piping system. In order to maintain the water pressure, the well pump is switched on and off with a pressure switch.

This usually means the pump is turned on when the pressure switch senses the pressure is at a low point (the “cut-in” point) and off at a pre-set high-pressure point (the “cut-off” point).  In some systems, there is no simple on and off pressure switch. These systems have a pressure sensor that works with a controller to allow the pump to pump more or less in a gradual method, which is called a “constant pressure” system.

This system uses a variable speed pump, which allows the pump motor to spin faster or slower and pump water faster or slower based on the pressure sensor. These are becoming increasingly popular but the most common is the simple off and on pump system which uses a simple pressure switch.

The 7 warning signs associated with water well problems are:

1. The well is pumping air and well yield is reduced

2. The well is pumping sand or large amounts of sediment

3. Water pressure is low

4. The power bill has skyrocketed

5. Water quality has changed

6. Dissolved gasses or bubbles in the water

7. The pressure switch and pump continuously cycles on and off

1. The Well is Pumping Air

If you turn on your kitchen faucet and out blasts a mixture of air and water, this can be an indication that something is drastically wrong within the well. The worst case scenario is that your water table has dropped to a point that is at or below the well pump, and the pump is drawing in air sometime during the pump cycle.

Another cause would be that the well pump drop pipe (the pipe that connects the pump to the top of the well and the water system) is broken. Drop pipes are made of either iron pipe or plastic PVC or poly pipe. They may become broken/corroded and develop cracks or even in some instances break apart, allowing for air to be sucked in. This kind of problem needs to be looked into and repaired by a skilled well or pump company.

2. The Well is Pumping Sand or large amounts of sediment

If your well suddenly starts to pump sand, this is often a sign that the well is silting in, or filling with sand and silt. Typically, the well pump is installed so it is at least 10 – 20 feet above the bottom of the well.

When the pump turns on the water level in the well it can drop to a lower level. If the pump is down near the bottom of the well, sand and sediment can be sucked in.

Other causes for sand in water can be that the well screen has become degraded and is allowing sand or sediment in from the gravel pack around the well screen.

Sand can quickly wear out the pump valves and fill up the bottom of the well with sand. In any case, a sudden presence of sand is not a good sign and the cause should be determined.

Sand can be removed from the water before the pressure tank or storage tank by means of a sand and sediment trapper or a 60 mesh filter screen with an automatic purge valve.

3. Low Water Pressure

There can be many causes of low water pressure including a failing well pump, stuck check valve, partially closed or bad gate/ball valve, and leaking/failing pressure tank. In some cases, iron bacteria clogs up the pipe nipple leading to the pressure switch causing the pressure switch to incorrectly sense the pressure.

If your well water tests high in iron bacteria, your pump and/or well screen may become clogged with iron bacteria. Having the well cleaned with a special solution designed to remove iron bacteria, slime and scale can often restore the well to a better condition.

In some well systems, the pressure is often set to turn on at 30 PSI and off at 50 PSI. For today’s homes and appliances, this pressure can be too low. Often it is possible to raise the pressure so the pump turns on at 40 to 50 PSI and off at 60 to 70 PSI providing an adequate water pressure in the home.

The pressure switch can often be adjusted to accommodate this higher pressure, assuming the well pump and well can operate without difficulty at the higher pressure. Air pressure inside the pressure tank must be adjusted if the pressure switch is adjusted.

4. The Electricity Bill has Skyrocketed

When a pump wears out, or becomes blocked with sand, silt or iron bacteria it needs to work much harder than if it was in good shape.

This can result in an increasingly higher power cost. Another common cause of a high power bill is when the check valve in the well goes bad. This allows water from the pressure tank to stream back down into the well. This enables water from your pressure tank to flow back down into the well, which then reduces pressure and signals to the pressure switch to turn the pump on again and pressurize the pressure tank.  This on and off cycle may occur every few minutes and essentially allow the well pump to run practically 24 hours a day, causing a high power bill.

5. Water Quality has Changed

Is the air dissolved in the water, or is it spurting out of the tap in big bursts?

This type of problem needs to be investigated and repaired by a professional well or pump contractor. In some cases, the water level is fine and there are no broken pipes or fittings.

Some groundwater tables do contain distinct types of gases. These gases may be dissolved in the water, but later come out of solution and cause water to spurt or sputter at the top.

6. Dissolved gasses or bubbles in the water

In some cases, the water level is fine and there aren’t any cracked pipes or fittings. Some groundwater tables do contain various types of gas. These gases may be dissolved within the water, yet later come out of solution and trigger water to spurt or sputter out of the tap. These types of gasses may be carbon dioxide, methane, hydrogen sulfide or other gasses, and can be harmful and cause significant safety and health problems. In the event that this is an on-going problem, the well can usually be treated to eliminate these gases by means of aeration and degassing systems.

7. Pressure Switch and Pump Continuously Cycles On and Off

This can be caused by a leak in the home so the well pump is continuously running. It can also be due to corrosion of well casing, liner or screen, causing holes. Holes can allow water of undesirable quality to enter the well. Look for leaking toilet flush valves, reverse osmosis systems, iron filters, and other backwashing filter systems that may be malfunctioning.

A common cause is a failed check valve. The check valve or foot valve prevents the well pressure tank from sending water back down into the well after it has built up with water pressure.

If the valve fails water streams back down the well and the pressure switch turns the pump on again.  This on and off cycle may occur every few minutes and essentially allow the well pump to run practically 24 hours a day, causing a high power bill. Replace the check valve and the problem is solved.

Another very common issue is the pressure tank losing its captive air pressure.  This is easy to check.  Turn off power to the well pump and run water after the pressure tank or in the house until there is no water pressure left.   Using a tire pressure gauge check the Schrader valve on top of the pressure tank.  It should be 2 PSI less than the cut-in or lower pressure.  If your well turns on at 30 and off at 50 PSI, it should have 28 PSI in it.

What to check for:

  • Change in water quality, often coupled with the sudden appearance of sediment in the water.
  • Failure of the annulus or casing seal
  • Iron bacteria or sulfate-reducing bacteria (biofouling)
  • Change in water quality such as color, odor (e.g. rotten egg) or taste. Check inside of toilet tank for slime buildup and inspect pump.
  • Contamination from man-made sources
  • Changes in water quality as indicated by color, odor or taste. Compare results from regular water analyses for changes.
  • Limited aquifer extent/Reduced aquifer recharge
  • Increase in constituents such as hardness, iron, manganese and sulfate. Compare results from original water analyses for changes. Taste and color changes in the water may also occur.

How to correct well water warning signs:

  • Consult with a licensed drilling contractor about possible repair. Alternate construction materials may be required.
  • Calculate the Langelier Saturation Index to determine the water’s corrosion potential.
  • Identify and remove the contamination source.
  • Have water analyzed to ensure it is safe to drink.
  • Install treatment systems to remove sand either in well or before the pressure tank.
  • To remove excess gasses in the water, install aeration and degassing system.
  • Shock chlorinate well water and piping system











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  • Clean Water Systems & Stores, Inc., Water Treatment Equipment,Service & Supplies, Santa Cruz, CA

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