Right now, there’s a machine the size of a baseball bat hanging 300 feet underground on your property, and your morning shower depends entirely on it. Most homeowners around Wenatchee have never seen theirs and couldn’t pick it out of a lineup.
That’s fine, honestly. You don’t need to be a pump tech. But if you’ve ever wondered how does a well pump work, knowing the basics pays off the day your water acts up. You’ll know whether you’re looking at a $30 pressure switch or a $4,500 pump replacement, and you’ll know when to stop poking at it and call someone.
This guide walks through the whole system in plain English. The parts, the cycle that runs every time you open a tap, the two main pump types, and what tends to break first here in North Central Washington. No jargon, no scare tactics.
The Five Parts That Get Water From Rock to Faucet
A private well system looks complicated in a diagram. In real life it’s five main pieces working together.
1. The well itself. A drilled hole, usually 6 inches across, lined with steel or PVC casing. Around Wenatchee, most residential wells run 100 to 500 feet deep depending on whether you’re in the valley or up on a bench. We covered local depths in our guide to how deep wells go in the Wenatchee area.
2. The pump. The motor that pushes water up. On most local properties it’s a submersible pump sitting near the bottom of the well, fully underwater. Older or shallow setups sometimes use a jet pump in the pump house instead.
3. The drop pipe and wiring. The pipe the pump hangs from and pushes water through, plus the electrical cable that powers it. On a 400-foot well, that’s 400 feet of pipe and wire you never see.
4. The pressure tank. A tank, usually in your basement, garage, or pump house, that stores a few gallons of pressurized water so the pump doesn’t have to start every time you rinse a coffee cup.
5. The pressure switch. A small box, about the size of a deck of cards, that turns the pump on and off based on water pressure. It’s the brain of the whole operation, and it costs about $30 in parts.
If your water is doing something weird right now and you’d rather skip the theory, give us a ring at (509) 224-3484. We answer 24/7 and we’ll tell you over the phone whether it sounds minor or urgent.
How Does a Well Pump Work, Step by Step?
Here’s the cycle that happens dozens of times a day in your house. Once you see it, every weird symptom your system ever throws at you will make more sense.
Step 1: You open a tap
Water flows out of the pressure tank, not from the well. The pump isn’t even running yet. The tank holds water squeezed against a cushion of compressed air, and that air pressure is what pushes water through your pipes.
Step 2: Pressure drops to the cut-in point
As the tank empties, system pressure falls. Most homes run a 40/60 switch, meaning the pump kicks on at 40 psi and off at 60 psi. Older systems often run 30/50. When pressure hits the low number, the pressure switch snaps its contacts closed and sends power down the well.
Step 3: The pump pushes water up
A submersible pump is a stack of small spinning impellers, sometimes 10 or 20 of them, each one adding pressure like runners in a relay. A half-horsepower motor spinning at 3,450 rpm can lift water hundreds of feet. The water travels up the drop pipe, through a check valve that keeps it from falling back down, and into your plumbing.
Step 4: The tank refills and the switch cuts out
Water refills the pressure tank, compressing the air cushion. When pressure climbs back to 60 psi, the switch opens, the pump stops, and the system sits quietly until the next demand.
That’s the whole show. Tap opens, pressure falls, pump runs, pressure rises, pump stops. Every well problem you’ll ever have is a breakdown somewhere in that loop.
The U.S. Geological Survey has a good plain-language overview of how groundwater wells work if you want the geology side of the story.
Submersible vs Jet Pumps: How Each Type of Well Pump Works
Around here, roughly 9 out of 10 homes we service run submersible pumps. But jet pumps still show up, especially on older Cashmere and Leavenworth properties with shallow wells near the creeks.
Submersible pumps sit underwater near the bottom of the well and push water up. Pushing is efficient. Water can be pushed almost any practical distance, which is why submersibles handle the deep wells common on the benches above East Wenatchee and out toward Quincy.
Jet pumps sit above ground and pull water up using suction. Physics caps suction at about 25 feet of practical lift, so a true shallow-well jet pump only works where the water table is high. Deep-well jet pumps cheat with a second pipe and an injector down the well, but they’re noticeably less efficient.
Here’s how they stack up:
| Feature | Submersible Pump | Jet Pump |
|---|---|---|
| Location | Underwater, in the well | Above ground, in pump house |
| Practical depth | 100 to 1,000+ feet | About 25 ft (shallow), 90 ft (deep-well) |
| Noise in the house | Silent | Audible hum and click |
| Typical lifespan | 10 to 15 years | 8 to 12 years |
| Installed cost (typical) | $2,500 to $5,500 | $1,200 to $2,800 |
| Freeze risk | Very low | Higher, needs heated space |
| Priming needed | No | Yes, loses prime if air gets in |
If you’re weighing the two for a replacement, our full submersible vs jet pump comparison goes deeper on which makes sense for your well depth and budget.
Quick local story. Marv, who runs a small orchard property outside Cashmere, had a 1980s deep-well jet pump that lost prime every few weeks. He’d been re-priming it himself for three years, sometimes at 6 a.m. before irrigation. His well was 85 feet with a static water level at 40. We swapped him to a half-horse submersible for $3,200, and his power bill dropped about $14 a month because the submersible doesn’t fight suction losses. He told us the best part was never opening that priming plug again.
The Pressure Tank and Switch: Small Parts, Big Job
The pump gets all the attention, but the pressure tank and switch decide how long that pump lives.
What the pressure tank actually does
A modern tank has a rubber bladder or diaphragm inside. Water on one side, compressed air on the other. A typical 44-gallon tank only holds about 10 to 12 gallons of usable water, which surprises people. Its real job isn’t storage. It’s preventing the pump from starting for every small water draw.
Pump motors hate starting. The startup surge draws several times the running current and heats the motor windings. A healthy tank means your pump might start 30 to 50 times a day. A failed tank can push that past 300, and that’s how a pump that should last 15 years dies at 6.
When the bladder fails, the tank gets waterlogged and the pump starts rapid-fire cycling, on for a few seconds, off for a few seconds. You can read more about catching that early in our posts on waterlogged pressure tanks and pump short cycling.
What the pressure switch does
The switch is just a spring-loaded set of electrical contacts that respond to water pressure. Simple, cheap, and the single most common failure point in the whole system. Contacts pit and burn, the little sensing tube clogs with sediment, springs drift out of adjustment.
The good news: a switch is a $150 to $350 service call, not a pump replacement. The bad news: a bad switch can mimic a dead pump perfectly. That’s why we always tell people not to assume the worst when the water stops.
Karen, up on the south shore of Lake Chelan, called us last August convinced her pump was dead. No water, mid-heat-wave, house full of weekend guests. She’d already gotten a $5,800 replacement quote over the phone from an outfit that never came out. Our tech found a pressure switch with burned contacts and a sediment-plugged nipple. Total bill: $240. She had water again 40 minutes after we pulled in the driveway. Not every call ends that cheap, but plenty do, which is why a real diagnosis beats a phone quote every time. If you want eyes on your system, schedule a free estimate and we’ll come take a look.
What This Means for Wells Around Wenatchee
The basics of how a well pump works are the same everywhere. The local conditions are not. A few things specific to Chelan, Douglas, and Grant counties change how these systems behave.
Deep wells work harder. A pump lifting from 400 feet on a bench above East Wenatchee runs at higher pressure and draws more current than the same pump at 100 feet in the valley. Pump sizing matters more here, and an undersized pump dies young.
Our water is hard and often sandy. Mineral scale builds up on impellers and check valves, and fine sediment wears pump internals like liquid sandpaper. It also clogs pressure switch sensing tubes, which is the Karen scenario above.
Winters bite. The pump itself sits below the frost line and never freezes, but pressure tanks, switches, and above-ground piping in unheated pump houses absolutely do. One hard cold snap in January keeps our emergency line busy for a week straight. Insulating the pump house before November is cheap insurance.
Irrigation doubles the workload. Lots of properties here run sprinklers or drip off the same well that feeds the house. Summer duty cycles in Quincy and Moses Lake can be brutal, with pumps running hours at a stretch through 100-degree weeks.
One more story on that last point. Teresa, outside Moses Lake, watered two acres of pasture off her domestic well every summer. Her 18-year-old pump finally quit on a Friday evening in July, no water for the house or the horses. Our on-call tech pulled the old pump that night and had a new three-quarter-horse unit set by 1 a.m. The pump had lasted 18 years, well past the average, but the lesson stuck: she now keeps our number on the pump house door. The full breakdown of what a job like that costs is on our well pump replacement page.
Signs Your Pump Is Struggling, and When to Stop DIY
Now that you know the cycle, here’s what the common symptoms usually mean:
- No water at all: Could be the breaker, the switch, the pump, or the well itself. Check the breaker first. That’s the one safe electrical check for a homeowner.
- Pulsing or sputtering water: Often a waterlogged tank or a failing check valve. Sometimes air in the lines.
- Pump clicking on and off rapidly: Short cycling. Tank or switch, usually. Fix it fast, because it’s killing the pump motor.
- Pressure slowly getting weaker over months: Worn impellers, scale buildup, or a dropping water table.
- Pump runs and never shuts off: Could be a leak, a stuck switch, or a well that’s struggling to keep up.
Any of these getting worse week over week is your cue to act, not wait.
Here’s the safety line, and we mean it. Checking your breaker panel and looking at the pressure gauge is homeowner territory. Opening the pressure switch cover, pulling a pump, or working on the wiring is not. Pressure switches carry 240 volts on exposed contacts, and wells plus electricity plus water is a combination that hurts people every year. The EPA’s private well owner resources are worth bookmarking for the maintenance side, but leave the live electrical work to a licensed tech.
When you hit that line, that’s our job. Wenatchee Well Pros handles well pump repair across the Wenatchee valley and everywhere from Leavenworth to Moses Lake, with 24/7 emergency response when the water just stops. Estimates are free and we’re licensed and insured in Washington. Call (509) 224-3484 day or night, or shoot a note to info@wenatcheewellpros.com if it can wait until morning.
Frequently Asked Questions
How does a well pump know when to turn on?
It doesn’t, exactly. The pressure switch does the thinking. When you use water, pressure in the system drops, and once it falls to the cut-in setting, usually 30 or 40 psi, the switch closes and powers the pump. When the pressure tank refills to the cut-out setting, the switch opens and the pump stops.
How long does a well pump run each time it turns on?
With a healthy pressure tank, a typical cycle runs one to three minutes. Long irrigation draws can keep it running continuously for hours, which is fine for a properly sized submersible. What’s not fine is rapid on-off cycling every few seconds, which usually means a tank or switch problem.
Does a well pump run all the time?
No. A healthy system runs only when pressure drops, then shuts off once the tank is full. If yours never seems to stop, you’ve likely got a leak, a stuck pressure switch, or a well struggling to deliver enough water, and it’s worth getting checked before the motor burns out.
How much electricity does a well pump use?
A typical half to one horsepower residential pump uses roughly 1 to 2 kWh per hour of actual run time, and most households only run the pump one to two hours a day total. That works out to about $5 to $15 a month for most homes around Wenatchee. A short-cycling or constantly running pump can triple that, so a jumping power bill is itself a diagnostic clue.