Should I repair or replace my well pump?

The rule, in two numbers

Two numbers settle most of these calls: how old the pump is and what the repair costs. Past fifteen years old with a repair running more than half the price of a new installation, replace it. Under ten years old with a fault that lives outside the well, repair it. Ten to fifteen is the band where judgment matters, and where the depth of your well decides it more than the age of the pump does.

That rule isn't arbitrary and it isn't about upselling. It comes out of one fact about this work: on a submersible, the expensive part of any job is getting the pump out of the ground and back in. The pull and reset is the same labor whether the crew finds a bad check valve or a dead motor, and on a deep well it is roughly half the invoice. Everything else on the paper is small next to it.

So the real question isn't repair versus replace. It's how many times you're willing to pay for the pull. Everything below is a way of answering that.

You pay the pull either way, so count how many pulls you're buying

Work an actual example. A fourteen year old submersible set at 380 feet quits. The crew pulls it, finds the motor weak but running and a failed check valve, and offers to put a new valve and a fresh splice on the old pump. You pay for the pull, plus a modest repair, and you are left with a fourteen year old motor at the bottom of a 380 foot hole. When it goes, and it will, you pay for the identical pull a second time. Two pulls to solve one problem is the outcome the rule exists to prevent.

Now flip one variable. A twenty-two year old pump at 150 feet, three wire, and the fault is a dead start capacitor in the control box at the surface. Nothing comes out of the ground, the repair is quick, and the pump keeps running. Fix it, at twenty-two years old, without hesitating. The rule about age only bites when the fix requires a pull. A surface fault is a surface fault at any age.

That's the whole insight, and it's why two houses a mile apart get opposite advice for the same symptom. Depth doesn't just make replacement more expensive. It makes being wrong more expensive, and on a 500 foot well being wrong twice is most of the price of doing it right once.

The ten to fifteen year band is where people want a rule and there isn't a clean one. What we look at there is what the string looks like coming out of the ground. If the cable jacket is supple, the poly pipe is clean and the motor tests strong, put it back and fix the fault. If the pipe threads are eaten, the splices are green, or the pump had to be jacked free of the casing, that pump is telling you it's older than its birthday and the next pull will be worse than this one.

One more piece of arithmetic worth doing, and you can run it on whatever numbers you are quoted. Ask what the repair buys in years, not in dollars, then divide. A modest repair that gets you eighteen more months and a full replacement that gets you twelve years with new pipe, new cable and a warranty often come out to almost the same cost per month. When they do, take the replacement, because it also buys you a decade of not thinking about it.

Repairs that are genuinely worth making

A lot of no-water calls aren't the pump at all. These parts fail on their own, on pumps of every age, and every one of them costs a fraction of a replacement. None of them is a stopgap either. A new switch on a nine year old pump buys you the rest of that pump's life, and a fresh tank can extend it.

The pattern to notice: everything on this list either sits at the surface or protects the pump rather than being the pump. That's what makes them good repairs at any age. The pump's remaining life doesn't factor in, because you aren't spending money on the pump.

• Pressure switch. Contacts pit and burn from arcing every time the pump starts. An ordinary service call, the part rides on every truck, and it's the single most common no-water cause we find.
• Control box or start capacitor. On a three wire setup the starting components live in a box on the wall, not in the well. A dead capacitor stops a perfectly healthy pump cold. A surface repair, and the pump never moves.
• Pressure tank. A waterlogged tank makes the pump short cycle, and short cycling is what kills motors. A same-day swap in most basements. The tank is the failure and replacing it protects the pump you still have.
• Check valve or foot valve. Water falling back down the well between cycles reads exactly like a dying pump. It isn't. On a shallow setup this is cheap. On a deep well it costs a pull, which is the case where you replace the pump at the same time.
• Wiring, breaker, disconnect or a bad splice at the pitless. Electrical faults imitate a burned motor well enough to sell people a pump they never needed. This is why insulation resistance and an ohm check on the cable belong in every diagnosis.
• A clogged sediment filter or a shut valve. Not a repair so much as a discovery, and it ends more calls than anybody expects.

When there's nothing left to repair

Once the motor itself is gone, a residential submersible has no repair. They're sealed units, filled at the factory with water or oil, and the windings aren't serviceable in the field. A rebuild on a four inch residential pump costs close to a new one and carries less warranty, so that road ends at replacement regardless. Same for a cracked impeller stack or a shaft that's seized from running dry.

Replace rather than repair when any of these are true. The pump is past fifteen. The motor tests shorted to ground or open. The well is deep enough that a second pull is a real cost. The pump is undersized for what the house uses now, which is common on houses that added a bathroom or an irrigation zone since the pump went in. Or the drop pipe and cable are the same age as the pump, which they almost always are.

That last one carries more weight than people give it. Pipe and cable have hung in the same water under the same load for as many years as the motor has. On an older well, once the string is out on the lawn where you can see it, the cable jacket is brittle and the splices have gone green and the galvanized pipe is scaled half shut. Putting that back down the hole to save a line on the quote is how you buy a second pull inside two years.

Age on its own isn't a reason to replace a pump that works. We don't swap on a schedule and we don't recommend it. What we recommend is replacing the old parts while the well is already open and the pipe is already lying in the yard, because that's the only cheap moment there is.

Depth, and why the same symptom gets two answers

A pump at 100 feet and a pump at 450 feet aren't the same decision, and treating them the same is how homeowners end up paying twice. The deeper the well, the more of the invoice is labor, and on a 500 foot well roughly half of it is. That flips the arithmetic. On a deep rock well, we lean toward replacing the pump, the pipe and the cable together while everything is up, because the second pull is the expensive mistake.

On a shallow jet pump sitting on a slab in your basement, the opposite holds. Nothing comes out of the ground, the parts are in front of you, and a repair costs so little that trying it first makes sense even on a twenty year old unit. If it fails again in a year, you're out a service call, not a day of hoist time.

Water quality is the quiet third variable in this area. Iron and manganese in Highlands bedrock build scale on the pump body and cement it against the casing wall, so the second pull on a well like that is genuinely harder than the first was. When a crew has already jacked a pump free once, planning to do it again in two years isn't a plan.

Well yield belongs in the conversation too. If the static water level has dropped since the pump was set, replacement is the moment to reset the depth, put the pump deeper into the standing column, and add a low water cutoff so the next dry September doesn't burn up the new motor. Doing that during a replacement is nearly free compared with doing it as its own trip later.

What to ask before you decide

Whoever is standing at your wellhead, these questions get you a straight answer or they tell you something by how badly they're answered.

Ask the last one out loud and watch how long it takes. How fast the answer comes tells you as much as the other five together. And whatever gets decided, get it on paper before the work starts: the depth, the pump make and horsepower, whether pipe and cable are included, and a warranty that says whether it pays the labor to pull the thing again in month twenty.

If you'd rather have somebody measure the well before anybody quotes you a pump, call Don at 973-853-1550. A diagnostic visit gets credited against the repair when we do the work, and a fair number of these calls end with a small part instead of a pump job. That is the whole reason to diagnose before you decide.

• How deep is the well, how deep is the pump set, and how did you measure it?
• What test showed the pump is bad, rather than the switch, the tank, the control box or the cable?
• If we repair this, what's the realistic life left on the pump?
• What does the pull cost by itself, separate from parts?
• Does the warranty cover parts only, or parts and the labor to put it back?
• What would you do if this were your house?