hard water spots and limescale buildup in dishwasher

Dishwasher Not Working? Spot the Hard Water Signs

You load the dishwasher. Hit start. Walk away feeling smug because, hey, one less thing on your to‑do list. But when you open it later, you’re staring at cloudy glasses, streaky plates, and maybe even a chalky film on the inside.
First thought? “Great. My dishwasher’s not cleaning well.”
Not so fast. If your dishwasher isn’t cleaning like it used to, there’s a good chance the real culprit isn’t the appliance. It’s your water.

 

Why isn’t My Dishwasher Working Properly?

Stressed out woman frustrated with your dishwasher

Let’s cut to it: you're not dealing with a broken dishwasher, but you might be battling hard water. Hard water is water loaded with minerals like calcium and magnesium. It’s not dangerous to drink, but it causes issues when that mineral-rich water flows through your dishwasher.

Consistent Dishwasher Problems From Hard Water:

  • Your dishwasher is not cleaning dishes well
  • A constantly clogged dishwasher
  • Reduced water pressure in your dishwasher

Over time, those minerals cling to the insides of your machine like barnacles on a boat. And get a thick enough coat of it: your spray arms clog, filters gunk up, and detergent doesn’t foam the way it should. Suddenly your spotless clean streak is gone.

 

Hard Water 101: Why It’s Bad News for Your Dishwasher (and Your Home)

Dishwasher components covered in hard water scale laid out on a kitchen countertop

Hard water doesn’t just make dishes look bad. The scale that builds up from hard water is damaging to your home plumbing, pipes, and any appliance that uses your home water.

In your dishwasher, it clogs spray jets, coats the interior, and forces the motor to work overtime. Outside the kitchen, it does the same to your washing machine, water heater, and plumbing. That mineral deposit in your dishwasher? It’s called limescale or hard water scale, and it’s stealing years from your appliances.

The Cost of Ignoring Hard Water

  • Shorter appliance lifespan
  • Higher energy bills
  • Wasted detergent and rinse aid
  • Costly repairs that could have been avoided

Bottom line: If your dishwasher isn’t cleaning properly, there’s a good chance it’s not broken, it’s just losing the battle against hard water.

 

Signs of Hard Water in Your Dishwasher

Hard water limescale buildup in dishwasher components

You don’t need a water test kit to suspect hard water. The clues are right in front of you:

  • White, chalky residue inside the tub or on heating elements
  • Cloudy glasses from dishwasher cycles
  • Soap that doesn’t lather or rinse away easily
  • Spots on dishes after washing even with rinse aid
  • Dishes that feel gritty or look dull, not shiny

If you’re nodding at more than one of these, you’re probably in the hard water club. But just how hard is your water? Check it instantly by typing your zip code into Aquasure’s How Hard is My Water? database.

 

How to (Temporarily) Fight Hard Water Spots in the Dishwasher

A person holding up a frying pan with hard water spots all over it

If you’re truly in a bind and want to improve your next dishwasher cycle, there are temporary fixes.

Quick Maintenance Tips:

  • Run a monthly cycle with a dishwasher cleaner for hard water to clear out buildup.
  • Use a rinse aid to promote faster drying and fewer spots.
  • If you’re in a pinch, add a splash of white vinegar to the rinse cycle.
  • But if you want your dishwasher to run like new long-term, you'll need to fix the root problem. Neutralizing hard water with a whole house water softener yields better rinse results in every wash cycle and protects your appliance.


Why Soft Water Wins Every Time

A completely clean set of dishes fresh out the dishwasher

Soft water doesn’t just solve spotty dishes. It solves the deeper problem of reduced efficiency and damage caused by hard water minerals.

With hard water, you’re basically running your home like a car driving with the parking brake on. Everything works harder, costs more, and wears out faster. With soft water, you free your appliances from limescale that degrades efficiency and wears down appliance parts. 

Soft water flows smoothly, allowing appliances to do their job unencumbered by limescale buildup in your dishwasher.

With Softer Water You Can Expect:

  • Spotless, streak-free dishes right out of the dishwasher
  • Longer-lasting appliances (and less dishwasher repairs) thanks to scale-free plumbing and components
  • Cleaner rinses using less soap and detergent
  • Lower energy bills over time thanks to more efficient appliances

To fully protect your home and enjoy all the benefits of soft water, you need a reliable water softener system that works hard behind the scenes.

 

The Aquasure Fix: Harmony Series Water Softener

Aquasure's Harmony Series Water Softener and Fortitude pre-filter attached to a concrete wall

Enter the Aquasure Harmony Series water softener, your all-in-one solution for hard water troubles. This whole house water softener uses high-efficiency ion exchange to strip out calcium and magnesium before they can do any damage. From the moment water enters your home, it's softened and ready to work better in every room.

If you’re looking for a salt-free option, the Aquasure Serene Series Salt-Free water conditioner helps reduce scale buildup without adding sodium to your water or requiring electricity.

Either way, switching to soft water makes a visible difference. You’ll notice it in your dishes, your laundry, your shower, and your overall water quality.

 

Don’t Let Hard Water Ruin Your Clean Streak

A young woman happily unloading her dishwasher. All the dishes are spotless and clean.

If your dishwasher has been leaving you with more work than it should, don’t assume it’s a mechanical failure. Check your water. If it’s hard, the solution is simple…

Invest in an Aquasure Harmony Series water softening system today and enjoy spotless dishes, happier appliances, and a stronger home.

Want to know more about how hard water affects your home? Check out our blog posts focused on water softening.

FAQs

Why are there water spots on my dishes?
Water spots on dishes are usually caused by hard water. Minerals like calcium and magnesium dry onto the surface during the rinse cycle, leaving behind cloudy or chalky residue. If you're looking for tips on how to clean hard water spots on glass, try soaking items in a vinegar solution to dissolve the buildup. Using a rinse aid can help prevent future spots, but the best solution is installing a water softener to eliminate the minerals before they reach your dishwasher.
Is there dishwasher detergent for hard water?
Yes, there are dishwasher detergents specially formulated for hard water. These detergents are designed to break down mineral deposits like calcium and magnesium that often leave behind spots, film, and residue on dishes. For even better results, pair your detergent with a rinse aid and regularly clean your dishwasher. If you're wondering how to clean mineral deposits from a dishwasher, running a cycle with white vinegar or a hard water dishwasher cleaner can help. For a long-term fix, a water softener prevents these minerals from building up in the first place.
Why does my dishwasher leave spots on my dishes?
Those spots are mineral deposits left behind when hard water dries on your dishes. Without soft water, no amount of rinse aid will completely prevent them.
Does hard water damage my dishwasher?
Yes. Over time, limescale coats heating elements, motors, and spray arms. This reduces cleaning performance and can shorten your dishwasher’s lifespan.
How do you know if you have hard water?
Look for cloudy glassware, chalky residue, poor soap lathering, and mineral buildup on faucets. A water test kit can confirm hardness levels.
How do I prevent hard water buildup in my dishwasher?
Install a water softener for whole‑home protection. In the short term, use dishwasher cleaner, rinse aid, and vinegar rinses to manage buildup.

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