Can Hard Water Leave White Film in a Dishwasher?

The answer

Yes. Whirlpool states that white film can be due to hard-water minerals and that those minerals tend to build up in the dishwasher.

Why

The white appearance can be mineral residue rather than ordinary food soil. Whirlpool also recommends periodic dishwasher cleaning and notes that dishwasher cleaner can help reduce mineral deposits that build up over time.

When it is usually OK

• The home has hard water and a white mineral-like film appears.
• White residue is visible inside the tub or on dishes.

When you should not

• Do not assume every cloudy mark is hard-water film; Whirlpool separately describes other kinds of marks and glassware changes.
• Do not treat a hard-water diagnosis as certain without comparing the appearance and local water conditions.

Risks and exceptions

• Mineral deposits can accumulate over time if the hard-water condition continues.

Best practice

If the film matches Whirlpool's hard-water description, use the cleaning guidance provided for the dishwasher and clean the appliance monthly or as needed.

Alternatives

• Use a dishwasher cleaner where the manufacturer says it helps reduce mineral deposits.
• Clean the dishwasher monthly or as needed, as Whirlpool recommends on this page.

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