Hardness, total
Overview
The hardness of water is commonly expressed in an equivalent quantity of calcium carbonate that represents the major cations found in water including calcium, sodium, potassium, and magnesium. Sources of hardness are from all different rock types. Information of the hardness of water is used by water treatment managers to determine amounts of chemical to add during the treatment process.
Stations That Measure or Compute Continuous Hardness
Click a station to view measurements of hardness.