When elevated levels of calcium and magnesium exist naturally in water, they can make water “hard.” While these minerals pose no harm to human health or safety, they can cause spots on clean dishes and clog pipes, which can reduce water pressure.

NTMWD’s water is considered moderately hard. To determine the grains per gallon of hardness of your water, refer to our water quality reports and divide the total hardness (mg/L) by 17.12. Read the hard water fact sheet for more information.


NTMWD-WaterHardness Fact Sheet 12-5-2018