When the problem is detected in our system, we control the problem by using potassium permanganate at the water treatment plant. In as much as the problem of taste and odor may be apparent in the water, the water is safe to drink. Water that is refrigerated overnight in a sealed container does taste better as it has been given time to settle. We recommend keeping a jug of water at all times in the refrigerator. This also gives you the benefit of always having a cool drink of water.
Hard water is defined by the amount of calcium and magnesium present in the water.
Hard water has a relatively high level as compared to soft water which has a low level. Corpus Christi tap water is considered moderately hard. Testing conducted in 1999 showed 182 milligrams per liter or about 10.6 grains per gallons. Fluoride, which is a substance added to reduce cavities, is added to our water. The American Dental Association recommends a concentration of 1 part per million.