aesthetic
Water Hardness (Calcium/Magnesium) in your water
Health effects
Hardness is dissolved calcium and magnesium. Not a health hazard, but it causes limescale on fixtures and water heaters, spotting on dishes, reduced soap lather, and can shorten appliance lifespan. Measured in grains per gallon (gpg).
The guideline vs. the legal limit
The federal legal limit is the maximum allowed by law. The EWG health guideline is what independent scientists consider safe — it is often far stricter.
Health guideline (EWG)
No health guideline set
Federal legal limit (MCL)
No federal limit set
Source: EWG Tap Water Database & EPA MCLs · 2026
What removes Water Hardness (Calcium/Magnesium)
We're still cataloging certified systems for Water Hardness (Calcium/Magnesium). A free water test is the fastest way to get a matched recommendation.
- 1
See your Water Score
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Get your custom fix-it plan
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Book your free 30-min test
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Is Water Hardness (Calcium/Magnesium) in your water?
Check your city's public record, then book a free 30-minute test to confirm what's in your home.