Well Water Systems: Pump Maintenance, Pressure Tanks, and Water Testing
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About 13% of US households rely on private wells for drinking water. Unlike municipal water, nobody is testing or treating your well water for you. The well owner is responsible for pump maintenance, water quality testing, and treatment. Understanding your system — pump, pressure tank, piping, and water characteristics — lets you maintain it properly and catch problems early.
How a Well Water System Works
A submersible pump sits inside the well casing, typically 50-300 feet below ground depending on the water table. When you open a faucet, the pressure tank delivers water immediately. As the tank pressure drops, a pressure switch activates the pump, which pushes water up from the well into the pressure tank, restoring pressure.
The pressure switch cycles the pump on at a low setpoint (typically 30 or 40 PSI) and off at a high setpoint (50 or 60 PSI). A standard residential system uses a 30/50 or 40/60 switch.
The pressure tank contains a rubber bladder filled with air. The air compresses as water enters and expands as water leaves, maintaining pressure between pump cycles. Without the tank, the pump would cycle on and off every time someone opened a faucet — destroying the pump in months.
Pressure Tank Maintenance
Check the tank air pressure annually with a tire gauge at the valve stem on top of the tank. The air pressure should be 2 PSI below the cut-in pressure of the pressure switch. For a 30/50 system, the tank should be at 28 PSI. For a 40/60 system, 38 PSI.
Check the pressure with the pump off and the tank drained (open a faucet until the pump kicks on, then turn off the pump at the breaker). If the air pressure reads zero, the bladder has ruptured. The tank is now completely waterlogged — it fills and empties on every pump cycle. Replace the tank.
A waterlogged tank causes rapid cycling (the pump starts and stops every few seconds). This wears the pump, the pressure switch contacts, and the check valve. If you notice rapid cycling, check the tank pressure immediately. Catching this early saves the pump.
Pressure tanks last 10-15 years on average. Pre-charged bladder tanks (Well-X-Trol, Flexcon) last longer than older diaphragm tanks. When replacing, upsize if possible — a larger tank means fewer pump cycles and longer pump life.
Pump Troubleshooting
No water at all: check the circuit breaker for the well pump. Check the pressure switch contacts (they can corrode or pit). Check the pressure gauge — if it reads zero, either the pump has failed or the check valve (the one-way valve that prevents water from flowing back down the well) is stuck open.
Low pressure: check the tank air charge first. If the tank is fine, the pump may be losing capacity (impeller wear after 10-15 years), the well may be producing less water (dropping water table), or a pipe fitting is leaking between the well and the house.
Pump runs continuously and never shuts off: the pressure never reaches the cut-off point. Causes: a leak in the piping between the well and the tank, a failed check valve allowing water to drain back into the well, a worn pump that cannot reach cut-off pressure, or a pressure switch malfunction.
Submersible pump replacement is not a DIY job for most homeowners. The pump sits 50-300 feet down the well on the end of a string of pipe. Pulling and replacing it requires specialized equipment and a well service company.
Water Testing
Test annually for bacteria (coliform), nitrates, and pH. These are the minimum recommended tests for any private well. Your county health department or cooperative extension office can recommend a certified lab and may offer testing at reduced cost.
Test every 3-5 years for a broader panel: hardness, iron, manganese, sulfate, total dissolved solids, and any contaminants common to your area (arsenic, radon, fluoride, pesticides, volatile organic compounds).
Test immediately if: the water changes color, taste, or smell; there is flooding near the well; a new contamination source appears nearby (fuel tank, agricultural operation, septic system failure); or anyone in the household has unexplained gastrointestinal illness.
Well water test kits from hardware stores give rough screening results. For definitive results, use a state-certified lab. The cost is $25-100 for basic tests and $100-300 for comprehensive panels.
Common Water Quality Issues and Treatment
Hard water (calcium and magnesium): causes scale buildup and soap scum. Treat with a water softener.
Iron (orange staining, metallic taste): treat with an iron filter (oxidizing filter, greensand filter, or air injection system) upstream of the water softener. Standard softeners handle low iron levels but high iron requires dedicated treatment.
Sulfur (rotten egg smell): treat with an air injection system or a chlorine injection system followed by a carbon filter. The smell is hydrogen sulfide gas, which is unpleasant but not harmful at typical well concentrations.
Bacteria (coliform positive): the well needs shock chlorination (pouring bleach solution into the well, circulating it through the plumbing, and letting it sit 12-24 hours before flushing). Retest after two weeks. Persistent bacteria may require a UV disinfection system on the supply line.
Low pH (acidic water, blue-green staining on fixtures): treat with an acid neutralizer filter containing calcite or soda ash injection. Acidic water corrodes copper pipes and leaches metals.
Well Maintenance
Keep the well cap sealed and above grade. The cap prevents surface water, insects, and animals from entering the well. If the cap is cracked or missing, replace it immediately — this is the most common entry point for contamination.
Maintain a 50-foot setback from the wellhead to any septic system, fuel tank, chemical storage, or animal enclosure. These are minimum code distances in most states.
Do not use chemicals, fertilizers, or pesticides near the wellhead. Surface spills can reach the aquifer through the well casing if the grout seal has degraded.
If you notice a change in water quality or quantity, have the well inspected by a licensed well contractor. Well issues get worse over time, not better.
Frequently Asked Questions
How long does a well pump last?
Submersible pumps last 8-15 years depending on water quality, usage, and how often the pump cycles. Hard water with sand or sediment shortens the lifespan. A properly sized pressure tank that reduces cycling extends pump life significantly. Jet pumps (above-ground) last 10-20 years because they are accessible for maintenance.
My well water is suddenly cloudy or discolored. What should I do?
Stop using the water for drinking and cooking immediately. Run an outside faucet for 15-20 minutes — sometimes a temporary disturbance in the aquifer or a pipe air lock causes transient cloudiness. If the water does not clear, have it tested for bacteria and sediment. Cloudiness after heavy rain may indicate surface water infiltration through a damaged well cap or failed casing seal.
Can my well run dry?
Yes. Wells tap into an aquifer that can be depleted by drought, increased neighborhood usage, or dropping water tables. Signs: the pump runs dry and shuts off on the low-water cutoff switch, or air spurts from faucets. Short-term solutions: reduce water usage, let the well recover overnight. Long-term: deepening the well, fracking the well to improve yield, or drilling a new well in a better location. A well contractor can perform a yield test to determine the current production rate.