A Look at Hard Water Across the US

An overwhelming 85 percent of the USA has hard water, so the likelihood that you live in state or city with hard water is high. The following hard water map illustrates the varying zones of hardness across the USA.

Top Cities with Hard Water

  • San Antonio, TX
  • Minneapolis, MN
  • Indianapolis, IN
  • Las Vegas, NV
  • Phoenix, AZ
  • Tampa, FL
  • Jacksonville, FL
  • San Jose, CA
  • Kansas City, MO
  • Salt Lake City, UT

Did You Know?

Ancient seabeds covered most of the US, which left high concentrations of limestone in the ‘hard’ to ‘extremely hard’ regions.

Want to learn more? Watch this video: