Hardness ranges in grains per gallon (gpg) from 7.6 to 32.7, with an average of 17.2. Hardness is a term used to describe a characteristic of water. Hardness is mainly a result of the salts of calcium and magnesium naturally occurring in water. Our lab reports hardness as CaCO3 (Calcium Carbonate) in parts per million (ppm).
However, we provide the conversion from ppm to grains per gallon (grains of hardness per gallon) because that is the unit of measurement the water softeners use. For more information on water quality, download/view the City’s most recent Water Quality Report (PDF).