Most of our water is "groundwater", which means it is pumped from wells and naturally contains some calcium and magnesium. Water having a concentration of calcium and magnesium above 100 milligrams per liter (mg/l) is considered hard. The hardness of our water ranges between 120-190 mg/l. Water hardness can inhibit the cleaning action of soaps and can leave a white coating on plumbing fixtures. Some customers have installed water softening equipment to reduce water hardness.