EVELYSS / Guides / Beauty

Hard Water Hair Care: How to Fix Dull, Squeaky Hair If You Live in a Hard Water Area

“If your hair behaves on holiday and sulks the moment you get home, stop blaming your shampoo. It may be your taps. You can't argue with the water supply, but you can certainly stop it building up on your hair.”Her take

How do you know if hard water is the problem?

Hard water carries more dissolved calcium and magnesium. In Britain it's most common across much of the south and east of England, while much of Scotland and the north-west has softer water. Your water supplier's website will usually tell you the hardness for your postcode, which takes about a minute to check. There's no single national scale, but several suppliers class 200 to 300mg per litre of calcium carbonate as hard and anything above 300 as very hard.

Next, compare that with what you actually see. Limescale on your kettle and shower head is the household clue. On hair, look for shampoo that struggles to lather, a dry or squeaky feel after washing, dullness, a coated feel that returns quickly, and hair that behaves noticeably better when you wash it somewhere else. Remember that these signs can also come from styling products, heat damage or colour, so test the fixes below one at a time.

Use a clarifying or chelating shampoo properly

This is the main fix. A clarifying shampoo removes build-up from styling products and oils. A chelating shampoo contains ingredients designed to bind to minerals so they can be rinsed off. On the ingredients list, look for names such as EDTA, for example disodium EDTA or tetrasodium EDTA, or citric acid in formulas that mention mineral removal.

Start with once a week if your water is very hard and your hair is thick or oily, or once every two weeks if it's fine or dry. Wet your hair thoroughly, massage the shampoo into the roots, let it sit for the time the bottle suggests, and rinse thoroughly. Always follow with conditioner, because this kind of wash can leave hair feeling stripped. Use your regular gentle shampoo the rest of the time.

Try an acid rinse

A mildly acidic rinse can help hair feel smoother after washing and may help with light mineral residue. To make one at home, mix one tablespoon of apple cider vinegar or lemon juice into a jug holding about 500ml of cool water. Pour it over clean hair, avoiding your eyes, leave for a minute or so, and rinse well.

Use it once a week at most, and stop if your scalp feels sore or irritated. Don't use a stronger mix in the hope of quicker results, since a stronger acid is more likely to irritate skin. If you'd rather not mix your own, look for a rinse or conditioning treatment labelled for hard water. Colour-treated hair should have a strand test first, because acids can affect some tones.

Do shower filters and softeners actually help?

It depends on what they do. Most inexpensive shower-head filters target chlorine and sediment, and don't remove much calcium or magnesium, so they won't necessarily change hardness. Read the claims closely. If a filter says it softens water, look for details of how and how often the cartridge must be replaced.

A whole-house ion-exchange water softener does remove hardness minerals, but it's a major household purchase with installation, salt and upkeep, and it isn't an option for many renters. For a simpler experiment, finish your wash with a final jug of water from a filter jug designed to reduce limescale. It's low-cost and easy to stop if you notice no difference.

Adjust your routine for dry, dull or coloured hair

Hard water doesn't have to mean a complicated regime. Use a little less shampoo, and focus it on your scalp. Rinse for longer than feels necessary, then condition from mid-lengths to ends. Add a hydrating mask once a week and keep heat styling to a sensible temperature with a protector, because dry, rough ends show dullness most quickly.

If you colour or bleach your hair, tell your hairdresser you live in a hard water area. Mineral build-up can affect how colour looks and how it takes, and they may suggest a treatment before your appointment. Also ask before using a chelating shampoo right after colouring, since it can fade fresh tones faster. A purple toning shampoo helps blondes with brassiness but won't remove mineral build-up on its own.

What not to bother with

Don't wash hair more often to get rid of a coated feel. More exposure to hard water and more shampooing can both make hair feel drier. Likewise, don't keep adding oils and heavy serums on top of the build-up. They can leave hair looking flat without tackling the cause.

Be cautious about big claims. Hard water can make hair feel and look worse, but it's not a sensible explanation to settle on for hair thinning or a sore scalp. If you're shedding far more hair than usual, or your scalp is flaky, itchy or painful, see a pharmacist or GP rather than changing your shampoo again.

Questions people ask

The takeaway

Check your postcode, use a clarifying or chelating shampoo regularly, always condition after it, and read the small print before paying for a filter.

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