How long does a dishwasher last?

The short answer

Most dishwashers last between 9 and 12 years, with about 10 years being a fair average. Some run reliably past 15 years; others give out closer to 7. Where yours lands depends on the build quality, how hard your water is, how often you run it, and how well it's been cared for over time.

Think of that 10-year mark as a planning anchor, not a deadline. A dishwasher doesn't fail all at once on its birthday — it tends to drift from works great to works, mostly to something's clearly wrong.

What affects how long it lasts

Build quality

A stainless-steel tub generally outlasts a plastic one, and pricier machines often use better pumps, motors, and valves. This is one place where the original purchase decision quietly shapes the lifespan years later.

Water hardness

Hard water leaves mineral scale on heating elements, spray arms, and internal parts. Over the years that buildup makes components work harder and wear faster. Homes with very hard water often see shorter dishwasher lifespans unless the water is softened.

How often you run it

A dishwasher run twice a day in a busy household simply accumulates more wear than one run a few times a week. More cycles means more hours on the pump and motor.

Care and maintenance

Cleaning the filter, not overloading it, and catching small problems early all add years. Neglect — a clogged filter, ignored leaks, running it with food chunks still on the dishes — shortens its life.

Signs a dishwasher is near the end

None of these guarantees the machine is finished, but together they tell a story:

• Dishes coming out dirty or cloudy even after a normal cycle.
• Water pooling in the bottom that doesn't drain.
• Leaks onto the floor or visible water under the unit.
• Rust inside the tub or on the racks.
• Cracks in the tub or door.
• Loud or new noises during the cycle.
• Doesn't get hot — dishes feel cool and aren't drying.
• It won't latch or start reliably.

A leak, in particular, is worth taking seriously. Water reaching the floor or the cabinetry beneath can cause damage that costs far more than the appliance itself. If you see standing water or signs of a leak, it's worth having a qualified appliance technician or plumber look at it rather than guessing.

Repair or replace?

A common rule of thumb: if the repair costs more than half the price of a new dishwasher, and the unit is past about 8 years old, replacement usually makes more sense. A pump or control board failure in an older machine often tips the math toward replacing.

For a newer machine, or a simpler issue, repair is frequently the better value. A technician can tell you what's actually failing and what it will cost — which is the information you need to make the call. Diagnosing and repairing the internal parts is work for a professional, not a DIY project, both for safety and to avoid voiding any remaining warranty.

What to keep a record of

This is where good documentation pays off. Keeping a few details in your home record makes future decisions much easier:

• Brand, model, and serial number — usually on a sticker inside the door frame.
• Purchase or install date — so you always know its true age.
• Warranty terms and length, and where the paperwork lives.
• The installer or plumber who put it in.
• Any repairs: what failed, who fixed it, the date, and the cost.

When something goes wrong years later, that history tells you instantly whether the unit is still under warranty, whether it's had recurring trouble, and whether you're throwing good money after bad. It's also exactly the kind of detail a buyer appreciates if you ever sell the home.

A reasonable expectation

Plan for roughly a decade. Treat the machine well, watch for leaks, and keep its details on file. When the signs of failure start stacking up — especially water on the floor — get a professional opinion rather than ignoring it. A small, documented problem caught early is always cheaper than the damage a neglected one can cause.