A teaspoon of sand can destroy a $2,500 pump in under a year. That’s not a scare line, it’s what we see on service calls across the Wenatchee Valley every single month.
If you’ve noticed grit at the bottom of your glass, a sandpaper feel in the toilet tank, or faucet aerators clogging every few weeks, you’re right to be concerned. Sand in well water is never normal, and it never fixes itself. The good news is that every cause has a known solution, and most of them cost far less than the pump replacement you’re headed for if you wait.
In this guide, we’ll walk through why sand shows up in wells around Wenatchee, East Wenatchee, Cashmere, and the rest of North Central Washington. We’ll cover screen failures (the most common culprit), the other causes worth ruling out, what each fix costs, and how to protect your pump while you figure it out.
Why Sand Shows Up in Well Water
Your well doesn’t pull water from an open underground lake. It pulls from saturated sand, gravel, and fractured rock. The only thing standing between that material and your plumbing is the well screen, a slotted section at the bottom of the casing that lets water in and keeps sediment out.
When sand starts coming through, one of four things is usually happening:
- The well screen has corroded, cracked, or worn through. This is the big one, especially in wells over 20 years old.
- The pump is set too close to the bottom of the well. It stirs up settled sediment and sucks it straight in.
- The pump is oversized or the well is being overpumped. Too much velocity pulls fine sand through a screen that would otherwise hold it back.
- The casing or well seal is damaged. Surface soil and runoff sneak in from above, which is also a contamination risk.
Around here, geology matters too. Much of the Columbia River valley sits on glacial outwash, which is basically layered sand and gravel. Wells in Quincy, Moses Lake, and the flats around East Wenatchee are drilled right through it. That material makes for productive wells, but it also means the screen is doing heavy work every minute the pump runs. When the screen fails, sand has a short trip to your tap.
A little fine sediment after a heavy pumping day is one thing. Visible sand that keeps showing up is a mechanical problem, and it’s chewing on your pump right now. If you want a second opinion before it gets expensive, give us a call at (509) 351-8404 and we’ll talk through what you’re seeing. The phone call costs nothing.
Well Screen Failure: The Number One Cause of Sandy Well Water
Well screens don’t last forever. Steel screens corrode. Slotted PVC can crack. And in aggressive water, which is common in parts of Chelan and Douglas counties, a screen can fail decades before the rest of the well does.
Here’s how it usually plays out. Corrosion opens up a slot that was sized to block sand. Now grains slip through every time the pump kicks on. The sand scours the screen opening wider, more sand comes through, and the failure accelerates. That’s why homeowners often say the grit “came out of nowhere.” It didn’t. It built slowly, then crossed a threshold.
How to tell it’s the screen
A few patterns point to screen failure rather than a pump or casing issue:
- Sand appears when the pump first kicks on, then the water runs clearer
- The amount of sand has been increasing over months
- Your well is 20+ years old, or it was drilled with a steel screen
- Sand grains are coarse and uniform, not fine silt or surface soil
Marlene in East Wenatchee called us last spring after finding a quarter inch of sand in her toilet tank. Her well was drilled in 1989 with a mild steel screen. When we pulled the pump, the impellers were worn nearly smooth, and a camera inspection showed two corroded holes in the screen the size of dimes. She’d been sanding down her own pump for at least a year without knowing it. The fix was a stainless liner and a new pump, about $6,200 total. Catching it a year earlier would have saved her the pump.
What fixes a failed screen
You can’t usually replace a screen outright without major work, but you have real options:
- Sleeve or liner installation. A smaller-diameter screen and liner is set inside the existing well, sealing off the failed section. This is the most common repair and saves the well.
- Gravel pack rehabilitation. In some wells, redeveloping the gravel pack around the screen settles things down.
- Drilling a new well. The last resort, reserved for wells where the casing itself is shot or the liner would choke off too much flow.
Screen and casing work overlaps a lot. If the camera shows damage above the screen, you may be looking at well casing repair instead of, or along with, a liner.
Other Causes Worth Ruling Out First
Before anyone quotes you a liner job, make sure the problem is actually the screen. We see plenty of “screen failures” that turn out to be a pump hung three feet too low.
Pump set too deep
Every well accumulates sediment at the bottom over time. If your pump sits within 10 to 15 feet of the bottom, it can pull that settled sand right up, especially when water levels drop in late summer. Wells around Leavenworth and Cashmere often run deep with modest storage, so a low-set pump is a common find. The fix can be as simple as raising the pump 10 or 20 feet. That’s a few hundred dollars in labor, not thousands.
Oversized pump or overpumping
A pump that moves more water than the well can comfortably supply creates high velocity at the screen. That velocity drags fine sand through openings that would hold at a gentler flow. This shows up a lot on irrigation setups, where someone upsized the pump to feed more zones. If your sand problem started right after a pump upgrade, this is your prime suspect. Our post on well pump sizing covers how to match a pump to your well’s actual yield.
Damaged casing or well cap
If what you’re seeing is fine soil, silt, or sediment that spikes after rain or snowmelt, the problem may be up top, not down at the screen. A cracked casing or a loose, degraded well cap lets surface material wash in. That’s more than a grit problem. Surface water carries bacteria, nitrates, and whatever’s running off nearby orchards. The EPA recommends private well owners test annually and inspect the wellhead regularly for exactly this reason. If your sediment comes with a change in taste or smell, get the water tested before anything else.
Rick, who runs a small orchard outside Quincy, learned this the hard way in 2024. His irrigation well started spitting sand mid-season and he figured the screen was gone. Turned out a tractor had clipped the casing two years earlier, leaving a crack just below grade. Every irrigation cycle pulled soil through it. A casing patch and new seal ran him $1,850, a fraction of the liner job he was bracing for. The lesson: diagnose first, then spend.
Not sure which cause fits your situation? Request a free estimate and we’ll camera the well, check the pump depth, and give you a straight answer before you commit to anything.
What Sand in Your Well Water Costs If You Ignore It
Sand is an abrasive. Your pump impellers spin at 3,450 RPM, and every grain that passes through acts like sandblasting media. Pumps that should last 15 years die in 3 to 5 when they’re moving sand. Then the damage spreads downstream.
Here’s the honest math on waiting versus acting:
| Problem | Fix It Now | Ignore It for 2+ Years |
|---|---|---|
| Pump raised off bottom | $300 to $600 | $2,500 to $5,000 pump replacement |
| Failed screen (liner repair) | $3,000 to $7,000 | $8,000+ liner plus new pump |
| Cracked casing near surface | $1,500 to $3,500 | Casing repair plus water treatment plus possible contamination |
| Sand separator installed | $800 to $1,500 | Wrecked pressure tank, valves, fixtures, water heater |
| Worst case, well is unsalvageable | n/a | $15,000 to $30,000+ for a new well |
Those last numbers aren’t padding. New well drilling in Chelan and Douglas counties commonly runs $40 to $70 per foot before the pump system, and plenty of wells here go past 200 feet. Sand also wrecks the small stuff along the way: pressure switch ports clog, check valves stick, the water heater fills with sediment, and the pressure tank bladder wears early.
Sand damage also masquerades as other problems. A sand-worn pump loses capacity gradually, which homeowners often mistake for a dropping water table or a pressure tank issue. If your pressure has been sliding along with the grit, read up on the signs your well pump is failing so you know what you’re looking at.
Solutions That Actually Work, From Cheapest to Biggest
Once the cause is diagnosed, here’s the toolbox, roughly in order of cost.
1. Raise the pump
If the pump is sitting in the sediment zone, lifting it solves the problem same-day. Cheap, fast, and surprisingly common.
2. Install a sand separator
A centrifugal sand separator mounts between the well and the pressure tank and spins sand out before it reaches your plumbing. It’s a great protection layer, and for wells that produce a small, stable amount of fine sand, it can be a permanent answer. It does not fix a failing screen, though. It buys time and protects equipment while you address the source.
3. Add filtration for fine sediment
For silt and fine particles that slip past a separator, a backwashing sediment filter or staged cartridge setup keeps fixtures and appliances clean. We cover the options in our guide to well water filtration systems. Again, filtration protects the house. It doesn’t protect the pump, which sits upstream of any filter.
4. Sleeve the well with a liner
The standard fix for a failed screen. A properly sized stainless screen and liner can add decades to a well’s life. Expect $3,000 to $7,000 depending on depth and diameter.
5. Replace the pump with sand-resistant equipment
If your pump has been eating sand, it’s likely on borrowed time even after the source is fixed. When replacement day comes, there are submersibles built with harder impellers and sand-shedding designs that handle our valley’s geology far better than the bargain units. Our well pump replacement crew installs them regularly in sandy wells around Quincy and Moses Lake.
6. Drill a new well
The last resort, for wells with collapsed casing or screens that can’t be lined without killing the yield. The Washington Department of Ecology regulates well construction and licenses drillers statewide, and their well construction resources are worth reading before you sign a drilling contract.
Protecting Your Pump While You Sort It Out
Maybe you can’t schedule the repair this week. Fair enough. A few moves will limit the damage in the meantime:
- Shorten heavy pumping sessions. Long irrigation runs at full draw pull the most sand. Split watering into shorter cycles.
- Don’t run the well down. Low water levels concentrate sediment at the pump intake. If your pressure is also sagging, that’s related, and our post on low water pressure from a well explains why.
- Flush your pressure tank and water heater. Get the sand out of the tank tee and the heater’s drain valve before it cements in place.
- Clean aerators and check valves. Clogged screens at fixtures make the pump work harder against restriction.
- Listen to the pump. A sand-worn pump often gets louder or starts short cycling. New noises mean you’re closer to failure than you think.
One more from the field. Dale in Cashmere noticed grit in his water in June 2025 and decided he’d deal with it after harvest. By October, his pump was drawing 30 percent more amps and the pressure tank had a half inch of sand packed in the bottom. The screen liner he eventually needed was always going to cost about $4,500. The pump, the tank bladder, and the emergency weekend call were another $3,900 he didn’t have to spend. Sand problems are patient. Your equipment isn’t.
If you’re seeing sand today, the smart move is a camera inspection and a pump check before anything else fails. Our well pump repair team runs diagnostics across Wenatchee, Leavenworth, Chelan, and the whole valley, and estimates are always free. Call (509) 351-8404 and we’ll get eyes on it, usually within a day or two.
Frequently Asked Questions
Is sand in well water dangerous to drink?
Sand itself isn’t toxic, but it’s a warning flag. If the sand is coming from a damaged casing or well seal, surface contaminants like bacteria and nitrates may be entering with it. Get the water tested any time sediment shows up alongside a change in taste, smell, or clarity, and treat the mechanical cause either way.
Will a whole-house filter fix sand in my well water?
It will protect your fixtures and appliances, but it won’t protect your pump, which sits in the well upstream of any filter. Filtration treats the symptom while the sand keeps grinding away at the pump and screen. Use filtration as a protective layer, then fix the source.
How much does it cost to fix a failed well screen?
Most screen liner repairs in our area run $3,000 to $7,000 depending on well depth, diameter, and access. Simpler causes cost far less. Raising a low-set pump might be $300 to $600, and a sand separator install typically runs $800 to $1,500. A camera inspection tells you which fix you actually need.
Why did sand suddenly appear after years of clean water?
Screen corrosion builds invisibly for years, then crosses a threshold where openings get big enough to pass sand. Sudden sand can also follow a pump replacement (if the new pump is oversized or set lower), a drop in the water table during a dry summer, or physical damage to the casing. The timing of when sand appears, and what changed right before, is the biggest diagnostic clue.