Water Health Check: Hard Water
Water hardness map by Jones
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Tap the map, get your water's grade. Real USGS readings, worldwide coverage, and what your hardness means for your skin, appliances, and energy bill.
Is your water hard? Tap the map and find out in two seconds.
Water Health Check grades tap water hardness anywhere on Earth, built on thousands of real USGS field samples, public utility water quality reports, and regional geological surveys.
SEE YOUR WATER
- A shaded world map of water hardness: every US state, every country
- Tap anywhere or search any city or ZIP worldwide
- Instant A-F grade with the measured hardness in mg/L and grains per gallon
- A second HEALTH grade scored from measured chemistry against EPA limits
KNOW WHAT IS IN IT
- 24 common water chemicals, each with a bar against its EPA limit or typical range
- Calcium, magnesium, iron, manganese, nitrate, arsenic, lead, and more
- Honest data badges: measured, utility reported, or regional estimate - you always know which
BEST WATER RANKINGS
- The 10 softest-water US states, ranked from real USGS readings
- Top 10 best-water cities for every country we cover
- Medal podium, shareable bragging rights
FREE FOREVER
- No account, no ads, no tracking. Your location never leaves your phone.
Brought to you by Jones Air & Water, the water treatment family serving greater St. Louis. If your water grades C or worse, we can fix it - and if you are in our area, the in-home water test is free.
Note: readings are informational area-level source-water data, not a certified lab test of your tap. Grades reflect mineral hardness and comparisons to EPA limits, not drinking safety.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Jacob Ochs, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jacob Ochs
- Size
- 2.6 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Ochs Holdings LLC