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, from the submersible pump at the bottom of the well to the pressure tank in your basement and the treatment equipment in between, lets you maintain it properly and catch problems early before they become expensive emergencies.
How a Well Water System Works
A submersible pump sits inside the well casing, typically 50 to 300 feet below ground depending on the local water table depth. The pump is a cylindrical motor and impeller assembly that pushes water up through a pipe (usually 1-inch polyethylene or galvanized steel) to the surface and into your home's plumbing system.
When you open a faucet, the pressure tank delivers water immediately. As the tank pressure drops, a pressure switch mounted on the plumbing near the tank detects the drop and activates the pump. The pump pushes water up from the well into the pressure tank, restoring the pressure. When the pressure reaches the upper setpoint, the switch cuts power to the pump.
A standard residential 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). The two common configurations are 30/50 and 40/60 systems. A 40/60 system provides higher water pressure throughout the house and is preferred in homes with multiple bathrooms or irrigation systems.
The pressure tank contains a rubber bladder filled with air. The air compresses as water enters the tank and expands as water leaves, maintaining consistent pressure between pump cycles. Without the tank, the pump would cycle on and off every time someone opened a faucet. This rapid cycling generates heat, wears out the motor, burns the pressure switch contacts, and destroys the check valve. A properly functioning pressure tank is what protects the pump from premature failure.
Pressure Tank Maintenance
Check the tank air pressure annually with a standard tire gauge at the Schrader valve 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 read 28 PSI. For a 40/60 system, it should read 38 PSI.
To get an accurate reading, 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 circuit breaker. Let the remaining water drain through the open faucet until flow stops. Now check the air pressure at the valve. If it reads low, add air with a bicycle pump or small compressor. If it reads zero, the bladder has ruptured and the tank needs replacement.
A waterlogged tank (one with a ruptured bladder or no air charge) fills and empties on every pump cycle because there is no air cushion to maintain pressure. The symptom is rapid cycling, where the pump starts and stops every few seconds when water is running. If you notice rapid cycling, check the tank pressure immediately. Catching a waterlogged tank early saves the pump from premature wear. Ignoring it for months can burn out a pump that would otherwise have years of life left.
Pressure tanks last 10 to 15 years on average. Pre-charged bladder tanks from brands like Well-X-Trol and Flexcon tend to outlast older diaphragm-style tanks. When replacing a tank, upsize if your plumbing can accommodate it. A larger tank stores more water between pump cycles, which means the pump runs less often and lasts longer. A 20-gallon tank is the minimum for most homes. A 32 to 44-gallon tank is better for households with higher water demand.
Pump Troubleshooting
No water at all: Start at the electrical panel. Check the circuit breaker for the well pump. If it has tripped, reset it once. If it trips again immediately, do not keep resetting it because the pump or wiring has a fault that needs professional diagnosis. Next, check the pressure switch contacts. Lift the cover and look for pitted, corroded, or burned contacts. A set of replacement contacts costs a few dollars and takes five minutes to swap. Finally, check the pressure gauge. If it reads zero, either the pump has failed, the pipe from the well has a break, 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, since this is the most common and cheapest cause. If the tank is fine, the problem may be a pump losing capacity due to impeller wear after 10 to 15 years of service, a well that is producing less water because of a dropping water table, or a leaking pipe fitting between the well and the house.
Pump runs continuously and never shuts off: The pressure is never reaching the cut-off point. The most common causes are a leak in the piping between the well and the pressure tank, a failed check valve allowing water to drain back into the well as fast as the pump pushes it up, a worn pump that can no longer reach the cut-off pressure, or a pressure switch malfunction. A pump that runs nonstop will overheat and fail, so turn off the breaker and diagnose the issue before running it again.
Submersible pump replacement is not a DIY job for most homeowners. The pump sits 50 to 300 feet down the well on the end of a string of pipe that can weigh hundreds of pounds. Pulling and replacing it requires specialized equipment (a well rig or a heavy-duty tripod with a winch) and a licensed well service company. Budget $1,500 to $3,000 for pump replacement depending on well depth and pump size.
Water Testing
Annual testing: At minimum, test your well water every year for coliform bacteria, nitrates, and pH. These three tests catch the most common and most dangerous contamination issues. Coliform bacteria indicate surface water or sewage contamination. Nitrates at high levels are harmful to infants. Low pH means acidic water that corrodes your plumbing and leaches metals. Your county health department or cooperative extension office can recommend a certified lab and may offer testing at reduced cost.
Comprehensive testing every 3 to 5 years: Run a broader panel that includes hardness, iron, manganese, sulfate, total dissolved solids, and any contaminants common to your geographic area. In some regions, that means arsenic, radon, fluoride, pesticides, or volatile organic compounds. Your state environmental agency publishes maps showing which contaminants are prevalent in which areas.
Test immediately if: the water changes color, taste, or smell; there has been flooding near the well; a new potential contamination source appears nearby (a leaking fuel tank, a new agricultural operation, or a neighbor's septic system failure); or anyone in the household develops unexplained gastrointestinal illness.
Well water test kits from hardware stores give rough screening results and can be useful for a quick check. For definitive results that you can act on with confidence, use a state-certified laboratory. Basic tests (bacteria, nitrates, pH) run $25 to $100. Comprehensive panels cost $100 to $300. Given that your family drinks this water daily, lab testing is money well spent.
Common Water Quality Issues and Treatment
Hard water (high calcium and magnesium) causes white scale buildup on fixtures and inside pipes, reduces soap effectiveness, and leaves spots on dishes and glass. Treatment is a whole-house water softener, which uses ion exchange to replace calcium and magnesium with sodium. Softeners need regular salt refills (40 to 80 pounds per month for a family of four) and occasional resin bed cleaning.
Iron causes orange and rust-colored staining on fixtures, laundry, and toilets, along with a metallic taste. Low levels (under 3 parts per million) can be handled by a standard water softener. Higher levels require a dedicated iron filter, either an oxidizing filter, a greensand filter, or an air injection system, installed upstream of the softener. Iron filters oxidize the dissolved iron into particles that can be filtered out.
Sulfur produces a rotten egg smell that makes the water unpleasant even if it is technically safe. The smell comes from hydrogen sulfide gas dissolved in the water. Treatment options include an air injection system that strips the gas out of the water, or a chlorine injection system followed by a carbon filter that removes the residual chlorine and any remaining odor.
Bacteria (positive coliform test) means the well needs shock chlorination. This involves pouring a measured bleach solution into the well, circulating it through the entire plumbing system, and letting it sit for 12 to 24 hours before flushing. Retest the water two weeks after treatment. If bacteria persists, a UV disinfection system installed on the main supply line provides continuous treatment. UV systems require annual bulb replacement (about $50 to $100) and work only if the water is clear enough for the UV light to penetrate.
Low pH (acidic water) causes blue-green staining on copper fixtures and accelerates corrosion of copper pipes, potentially leaching copper and lead into the drinking water. Treatment is an acid neutralizer filter containing calcite, which dissolves slowly and raises the pH, or a soda ash injection system for severely acidic water. Calcite filters need periodic media refills but are otherwise low maintenance.
Well Maintenance
Keep the well cap sealed and above grade. The cap is the first line of defense against contamination. It prevents surface water, insects, and animals from entering the well. If the cap is cracked, loose, or missing, replace it immediately. An unsealed well cap is the most common entry point for bacterial contamination, and it is also the cheapest fix (a replacement cap costs $20 to $50).
Maintain a 50-foot setback from the wellhead to any septic system, fuel storage tank, chemical storage area, or animal enclosure. These are minimum code distances in most states. Greater distance is better, especially uphill from the well. Contaminants in groundwater flow downhill, so a septic system uphill from your well presents a higher risk than one downhill.
Do not use fertilizers, pesticides, or herbicides near the wellhead. Surface spills can reach the aquifer through the well casing if the grout seal around the casing has degraded over the years. The annular seal (grout between the well casing and the borehole) is supposed to prevent surface water from migrating down the outside of the casing, but it can crack and deteriorate over decades.
If you notice a change in water quality or quantity, have the well inspected by a licensed well contractor promptly. Well issues get worse over time, not better. A slow decline in water pressure might indicate pump wear, a dropping water table, or a partially collapsed well screen. Early diagnosis is always cheaper than waiting until the system fails completely.
Frequently Asked Questions
How Long Does a Well Pump Last?
Submersible pumps last 8 to 15 years depending on water quality, daily usage, and how often the pump cycles. Hard water with sand or sediment wears the impellers faster and shortens the lifespan. A properly sized pressure tank that reduces cycling extends pump life significantly. Jet pumps (above-ground units used for shallow wells) last 10 to 20 years because they are accessible for maintenance and their components are easier to service.
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 to 20 minutes. Sometimes a temporary disturbance in the aquifer or a pipe air lock causes transient cloudiness that clears on its own. 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, which is a contamination risk that needs professional repair.
Can My Well Run Dry?
Yes. Wells tap into an aquifer that can be depleted by drought, increased neighborhood usage, or a regionally dropping water table. Signs include the pump running dry and shutting off on its low-water cutoff switch, or air spurting from faucets mixed with water. Short-term solutions include reducing water usage and letting the well recover overnight. Long-term fixes include deepening the well, hydrofracturing 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 and advise on the best course of action.