Hard Water and Your Hair

Hard water carries dissolved calcium and magnesium, and those minerals deposit on hair every time you wash. Over months they build a film that keeps moisture out, roughens the surface and dulls color. It is a common reason a routine that used to work stops working, and it is invisible until you know what to look for.

The signs

Shampoo that will not lather properly however much you use. Hair that feels rough or filmy immediately after washing, when it should feel cleanest. Conditioner that seems to sit on the surface without softening anything. Color that fades or turns brassy faster than it should. Persistent dryness that no amount of deep conditioning fixes. If several of those describe your hair and nothing about your products changed, the water is worth suspecting.

Where it comes from

Municipal water across Metro Detroit generally falls in the moderately hard range, which is enough to build up over time on textured hair without being extreme. Well water in the outlying townships is frequently much harder, and anyone who has moved from city water to a well usually notices the difference in their hair within a couple of months. Your water supplier publishes an annual quality report with the actual hardness figure if you want to know rather than guess.

Clarifying is not enough

An ordinary clarifying shampoo removes product buildup, which is a different substance. It does not bind minerals, so people with hard water clarify repeatedly and feel no improvement. What removes mineral deposits is a chelating shampoo, which contains ingredients such as EDTA that grip the minerals and carry them away. Once a month is usually enough, and always follow it with a deep conditioner, since chelating strips thoroughly.

Shower filters

They help and they do not solve it. Most filters reduce chlorine effectively and reduce some minerals partially, so the buildup slows rather than stopping. They need replacing on schedule to keep working, which is the part people forget. For most people a filter plus monthly chelating is a better combination than either alone, and considerably cheaper than a whole-house softener.

Small things that help

A final rinse with distilled or filtered water after washing, which is impractical daily but useful before a style you want to last. A diluted apple cider vinegar rinse occasionally, which helps smooth the cuticle, though it does not remove minerals the way chelating does. And washing with cooler water, which deposits less than hot water does.