Water - Hard and Soft
What is hard and soft water
When water falls as rain, it is "soft" and free of minerals. It picks up minerals as it passes through rock, sand and soil, so most water drawn from an aquifer will be hard'. Hard water is high in mineral salts, especially calcium and magnesium. Hard water, generally, is not harmful to our health and may indeed be beneficial.
Hard water isn't bad water, any more than soft water is 'good' water. For example, many tea and coffee drinkers do not like their drink made with soft water, preferring a degree of hardness. Generally people used to soft water will find hard water difficult and vice versa.
The sum of all calcium and magnesium compounds in water results in the total hardness, measured in milligrams calcium carbonate per litre (CaCO3 mg/L).
This means a property that can adversely affect taste, colour or general appearance of water. Guideline values (GV) are applied to aesthetics - these are levels that if exceeded, may make the water unattractive to consumers. The GV for total hardness is 200mg/L CaCO3.
Certain house hold appliance installation instructions ask if your water is Hard or Soft or what is the pH level of your water.
Latest Chemical Analysis Reports
Drinking-water Standards
The water services regulator, The Water Services Authority - Taumata Arowai, sets standards for all public water supplies in New Zealand under the Water Services Act 2021.
