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 goverment and private sources. We do not guarantee the water hardness figures are 100% accurate.

HOW IS HARD WATER MEASURED?

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:

PPM / GPG WATER HARDNESS
0 - 17 PPM
0 - 1 GPG
Soft.
17 - 60 PPM
1 - 3.5 GPG
Slightly Hard.
60 - 120 PPM
3.5 - 7 GPG
Moderately Hard.
120 - 172 PPM
7 - 10 GPG
Hard.
172 + PPM
10 + GPG
Very Hard.

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