Why does my well pump turn on and off every few seconds?

A well pump cycling on and off rapidly (short cycling) is almost always caused by a waterlogged pressure tank. When the air bladder in your tank fails, the tank fills with water and can only store a tiny amount before pressure drops and triggers the pump again. Other causes include a failing pressure switch, leaks in the system, or an undersized pressure tank.

Is short cycling bad for my well pump?

Yes, short cycling is extremely damaging to your well pump. Pumps are designed to run for 1-2 minutes, then rest and cool down. Rapid cycling causes motor overheating, premature wear on electrical components, and can reduce a pump's lifespan from 10-15 years to just months. It also dramatically increases your electricity bills.

How do I know if my pressure tank is waterlogged?

To test for a waterlogged pressure tank: turn off the pump and drain some water from the system. Tap on the tank from top to bottom—a healthy tank sounds hollow at the top (air) and solid at the bottom (water). A waterlogged tank sounds solid throughout. You can also check the air valve at the top; if water sprays out, the bladder has failed.

Can I fix short cycling myself?

Some causes of short cycling are DIY-fixable: if the pressure tank bladder is intact, you may just need to add air. Check the air pressure at the tank valve (should be 2 PSI below cut-in pressure). However, if the bladder has failed, the tank needs professional replacement. Pressure switch issues and system leaks may also require professional diagnosis.

How much does it cost to fix well pump short cycling?

Repair costs depend on the cause: recharging a pressure tank is often free (DIY) or $100-$200 for a service call. Pressure tank replacement costs $300-$800 including labor. Pressure switch replacement runs $150-$300. If short cycling has already damaged your pump, replacement costs $1,500-$3,500 or more depending on well depth.