Hard water is water that carries more dissolved calcium and magnesium than most households want. You may not notice it in a glass of water, but you will notice it where that water dries and leaves a deposit behind. These signs are the easiest way to decide whether scale is the problem you are trying to solve.

The signs to look for on fixtures

Look at faucet aerators, showerheads, and the spout of a kettle. White or chalky crust on these parts, a spray pattern that has narrowed over time, or flow that slows gradually and never fully recovers are common signs of scale. Check the inside of the shower door and the bottom of a sink basin for a film that does not wipe away easily with ordinary cleaner.

The signs in laundry and dishes

Glassware that looks spotty or cloudy after washing, dishes that feel gritty, and soap that lathers poorly are often linked to hard water. Laundry can come out stiff, and towels can feel rough even after a normal wash. Compare these signs with a neighbour's home only if you know the water is from the same source, because the same signs can come from other causes.

The signs at the water heater

A water heater that makes a rumbling or popping sound, takes longer to heat, or shows a buildup of sediment when drained can be affected by scale. Look at the drain valve when you flush the tank, and note the amount of grit you find. If the heater has an element, check whether the element is coated with a crust when you open the access panel.

Check the water report before you decide

Look at the hardness line on your current water report. The St. Charles Water Ratings report card is one place to start, though your own utility report or a recent lab result for your home is the better source for your specific supply. A hardness result that matches the scale you see is a strong sign that scale is the real problem.

Confirm with a simple test

If you have no recent hardness result, a basic hardness test kit can give you a rough reading at the tap. Test the cold water from a faucet you use for drinking, and note the result and the date you tested. A reading that is high enough to match the fixture damage points toward treatment. A low reading means the scale may come from another source, such as a heater that needs flushing or a fixture that needs cleaning.

What hard water is and is not

Hard water is generally treated as a nuisance and an equipment issue rather than a health risk, so the decision to treat it usually turns on fixtures, appliances, and cleaning costs. Make that decision from the signs you can see and the test results you have, and keep the records so you can compare before and after any change.