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Enter your zip code and see if you live in a hard water area with our water hardness tool. Lots of people live in hard water areas without knowing. How hard is your water?

*Disclaimer: The data in this tool comes to provide a general outline of water hardness throughout the USA. Water hardness figures are based on reports from government and private sources. We do not guarantee the water hardness figures are 100% accurate.


Hard water is measured in parts per million (PPM) and how many particles of hardness are dissolved in the water per million particles gives a rating. This rating has been developed over time to the following categories:

0 - 50 PPM
0 - 2.917 GPG
Is soft.
51 - 100 PPM
2.975 - 5.835 GPG
Is moderately soft.
101 - 150 PPM
5.893 - 8.752 GPG
Is slightly hard.
151 - 200 PPM
8.811 - 11.670 GPG
Is moderately hard.
201 - 275 PPM
11.728 - 16.046 GPG
Is hard.
276 - 350 PPM
16.104 - 20.422 GPG
Is very hard.
350+ PPM
20.422+ GPG
Is aggressively hard.

Reduce hard water issues for your entire home with our
Aquasure Harmony Series Water Softeners