Frequent Questions

What is hardness in water? How does it affect my drinking water?

Hardness is a measure of the amount of calcium and magnesium in the water. It is usually measured with combined calcium and magnesium levels and reported as Calcium Carbonate (CaCO3). The calcium and magnesium compounds can interfere with corrosion control because they are less soluble at high pH levels than at low pH levels. When corrosion control techniques are selected and implemented, hardness must be taken into consideration because it can cause unintended side effects such as increased scaling, both within the pump station and treatment plant or out in the service area (Revised Guidance Manual for Selecting Lead and Copper Control Strategies, EPA816-R-03-001, March 2003).
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