How Long Do Well Pumps Last?

Quality submersible well pumps typically last 10–15 years under normal conditions. Some last 20+ years with excellent water quality and proper sizing. Others fail in 5–7 years due to adverse conditions. The pump motor, impellers, and bearings are the components most subject to wear. In Southern Maryland, where iron, sediment, and low pH water are common, pump wear tends to be accelerated compared to areas with cleaner groundwater.

Iron and sediment are the primary enemies of well pump longevity. Iron deposits coat impeller surfaces and reduce efficiency. Abrasive sediment particles wear down impellers and bearings. Low pH (acidic) water corrodes metal components. Homes with untreated well water in Calvert County and surrounding areas often see pump failures on the shorter end of the lifespan range. Installing proper filtration upstream of the pump — or at minimum, a sediment pre-filter — significantly extends pump life.

Short cycling occurs when the pump turns on and off too frequently — sometimes dozens of times per hour. This is usually caused by a failed pressure tank bladder (waterlogged tank), a pressure switch set too close together, or a leak in the system. Each pump start puts significant electrical and mechanical stress on the motor. A pump that short cycles can fail years before its expected lifespan. If you notice your pump running in short bursts, address the pressure tank immediately.

Watch for these indicators that your pump is approaching end of life:

Don't wait for complete failure — a planned replacement is far less disruptive and expensive than an emergency pump pull.