Water hardness
Saint Paul, MN water hardness
Saint Paul's tap water measures 90 ppm, which is moderately hard. The number comes from Saint Paul Regional Water Services's 2026 published data, measured at the tap.
90 ppm
Moderately hard
Saint Paul shower water
Hardness bands per the U.S. Geological Survey.
Source: Saint Paul Regional Water Services, 2026.
Saint Paul Regional Water Services softens this water at the plant with lime treatment before it reaches you. The number above is what arrives at your tap, not what the source water measures.
Elsewhere in Minnesota, Minneapolis tests at 100 ppm.
What Saint Paul water means for your hair and skin
Between 61 and 120 ppm, effects are mild and many people never notice them. If your fixtures stay clean and soap behaves, this level is not worth treating.
Water hardness in nearby and regional cities
- Minneapolis, MN 100 ppm
- Milwaukee, WI 136 ppm
- Des Moines, IA 150 ppm
- Chicago, IL 139 ppm
- Madison, WI 308 to 370 ppm
Check your own zip code
Check the number for your exact address with the free zip lookup, or read the utility's own report linked above.