How do you measure water hardness, and why is it important to know?
Sara IdenforsWater hardness is an important factor for both households and industrial applications. It affects washing results, household appliances, and the taste of water, among other things. But how do you measure water hardness, and how can you find out the hardness of the water in your area? Here we explain what you need to know.

What is water hardness?
Water hardness is defined by its content of calcium and magnesium ions. The higher the concentration of these minerals, the harder the water. Soft water has a low concentration of these ions, while hard water has a higher concentration.
Hard water can cause limescale deposits in pipes, coffee makers, and washing machines, while soft water can improve washing results and reduce the amount of laundry detergent needed.
How do you measure water hardness?
There are several ways to measure water hardness:
1. Test strips: Test strips are easy to use and can be purchased in stores or online. Dip the strip in water, then after a few seconds compare the color with a scale showing the water’s hardness.
2. Drop test kits: A drop test kit works by adding a chemical indicator to the water. Depending on the number of drops required to achieve a color change, you can determine the hardness.
3. Digital meters: A digital meter is more advanced and provides an accurate hardness reading. These are often more expensive but are used in professional settings.
How can you find out your municipality’s water hardness?
If you do not want to measure it yourself, you can easily find out the water hardness in your area by contacting your municipality or the local water utility. Here are three simple steps:
1. Visit the municipality’s website: Most municipalities provide information about water quality on their website. Search for “water quality” or “water hardness.”
2. Call customer service: If the information is not available online, you can call the municipal waterworks or customer service for assistance.
3. Check the water report: Some municipalities send annual reports on water quality. These reports often contain information about hardness, pH levels, and other important parameters.
Why is it important to know?
Knowing the hardness of your water helps you to:
- Optimize your use of laundry and dishwashing detergents.
- Prevent limescale deposits in household appliances.
- Protect your pipes and reduce maintenance costs.
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Three questions to consider:
1. What is water hardness, and how does it affect you?
Answer: Water hardness depends on its content of calcium and magnesium ions. This affects laundry, cleaning, and household appliances.
2. What methods can you use to measure water hardness at home?
Answer: Test equipment is available to buy, but you can also contact your municipality for information.
3. How do you contact your municipality to find out the hardness of the water?
Answer: Start by searching the website. If you cannot find the answer there, contact the municipality by email or phone.
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