What is well pump short cycling?

Short cycling is when your well pump turns on and off rapidly, often every few seconds to a minute, instead of running for several minutes at a time. Normal pump operation involves running 1-2 minutes minimum before shutting off. Short cycling wastes energy, wears out your pump prematurely, and often indicates a system problem that needs attention.

What is the most common cause of well pump short cycling?

The most common cause is a waterlogged pressure tank. When the air bladder fails or loses its air charge, there's no air cushion to maintain pressure, causing the pump to cycle on with every small water draw. This accounts for roughly 60-70% of short cycling cases.

How do I know if my pressure tank is waterlogged?

Check by tapping on the tank—a waterlogged tank sounds the same solid thud all the way up, while a healthy tank sounds hollow at the top (where air should be). You can also check the air pressure at the valve stem with a tire gauge when the tank is empty. It should read 2 PSI below your cut-in pressure (typically 28 PSI for a 30/50 system).

Can short cycling damage my well pump?

Yes, short cycling significantly damages your pump. Each start draws 3-5 times more electricity than running, creating heat stress on motor windings. Frequent starting also wears out the pump's mechanical components faster. A pump that should last 10-15 years may fail in 3-5 years due to chronic short cycling.

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

Costs vary by cause: recharging a pressure tank costs $75-$150, replacing a pressure tank costs $400-$1,500, adjusting or replacing a pressure switch costs $150-$350, and fixing a check valve costs $200-$500. If the pump itself has been damaged from short cycling, replacement costs $1,500-$3,500+ depending on depth and pump size.

My pump short cycles only when no water is being used. Why?

This indicates a leak in your plumbing system or a failed check valve. When no fixtures are running but pressure still drops, water is escaping somewhere—either through a running toilet, leaking pipe, dripping faucet, or backwards through a faulty check valve into the well. This is actually the system working correctly to maintain pressure, but addressing the leak is essential.

How often should a well pump cycle normally?

A properly sized system should cycle no more than 4-6 times per hour during normal use. Each run cycle should last at least 1-2 minutes. If your pump is cycling more than once per minute during use, or cycling at all when no water is being used, there's a problem that needs diagnosis.

Can I fix short cycling myself or do I need a professional?

Some fixes are DIY-friendly: recharging a bladder tank's air pressure, adjusting pressure switch settings, or fixing a running toilet. However, replacing pressure tanks, servicing check valves, or diagnosing complex issues typically requires professional help. If you're unsure of the cause, it's best to call a well professional to avoid making the problem worse.