Roughly speaking: the further south and east you live in England, the harder your water. The further north and west, the softer. Scotland, Wales, Northern Ireland, Cornwall and much of the north west sit at the soft end. London, the Home Counties, East Anglia and the Midlands sit at the hard end.
That is the shape of it, and it is genuinely useful. But it is a generalisation, and hardness can change street by street depending on which reservoir or borehole feeds you. So this guide covers the rough geography, then shows you how to check your own postcode properly, and then explains what the answer actually means for your skin, your hair and your kettle.
Why some water is hard and some is not
Rain is soft when it falls. It picks up its character from the ground it travels through on the way to your tap.
Where the bedrock is chalk or limestone, water dissolves calcium and magnesium as it passes through. Those dissolved minerals are what hardness is. Where the bedrock is granite, slate or peat, very little dissolves and the water stays soft.
That is why the map looks the way it does. Southern and eastern England sit on chalk and limestone. Scotland, Wales and the south west sit largely on older, harder rock that gives up very little.
None of this is a water quality problem. Hard water is safe to drink and safe to wash in, and the minerals in it are the same ones people buy in supplements. It is a question of how it behaves, not whether it is safe.
The rough geography
Treat this as orientation, not as your answer.
Typically hard to very hard London and the whole of the south east. Essex, Kent, Sussex, Surrey, Hertfordshire, Bedfordshire, Buckinghamshire. East Anglia, particularly Cambridgeshire, Norfolk and Suffolk. Much of the Midlands. Parts of Lincolnshire, Oxfordshire and Wiltshire.
Typically moderate Bands running through the middle of the country, parts of Yorkshire, the Bristol area and pockets of the south west. This middle band is where the generalisation is least reliable, so checking matters most here.
Typically soft to moderately soft Most of Scotland. Most of Wales. Northern Ireland. Cornwall and much of Devon. Cumbria, Lancashire and Merseyside. Northumberland and much of the north east.
If you have moved from Glasgow or Cardiff to London and felt like your skin and hair changed overnight, this is why. It is one of the most common things people describe when they move south, and it usually gets blamed on stress or air quality.
How to check your actual postcode
This takes about a minute and it is the only part of this article that gives you a real answer.
- Find your water supplier. If you do not know, search your postcode plus "water supplier". It will be on your bill if you pay for water directly.
- Go to their website and find the water hardness or water quality page. Every supplier publishes one.
- Enter your postcode.
You will get a figure, usually in one of these units:
| Unit | What it means |
|---|---|
| mg/l calcium carbonate (CaCO₃) | The most common. Higher means harder |
| ppm | Numerically the same as mg/l |
| Degrees Clark (°Clark) | An older English measure, still used by some suppliers |
| Degrees German (°dH) | Occasionally used; different scale again |
Suppliers usually give you a word as well as a number — soft, moderately soft, slightly hard, moderately hard, hard, very hard — and the word is the part most people need. Different suppliers draw the boundaries between those bands slightly differently, which is worth knowing if you are comparing two areas.
Signs you can read without checking anything: limescale furring inside the kettle, white spots on shower glass that come back within a week, a stubborn film on taps, soap that will not lather properly, and towels that dry stiff. Four out of five of those and you can be fairly confident.
What hard water means for your skin and hair
Here is the part that matters more than the number.
The lather problem is the main mechanism. Calcium and magnesium react with soap to form a residue that does not rinse away cleanly. Some of that stays on skin and hair. On skin it can feel like tightness or a stripped, squeaky sensation. On hair it can feel like dullness, roughness or product that never quite washes out.
There is a behavioural knock-on that is arguably worse than the chemistry. When soap will not lather, people use more product and scrub harder, which is not what dry or sensitive skin needs.
Chlorine is a separate thing. Water companies use chlorine to keep the supply free from harmful bacteria on the way to your home, which is a genuinely good thing. But it is still present at the shower head, and in a hot shower with a steamy bathroom, people with dry or sensitive skin often say it is when they notice it most. Chlorine is not related to hardness at all, and this trips people up: soft water areas still have chlorinated water. If you are in Glasgow with lovely soft water and your skin still feels off after a shower, hardness is not your variable.
Heat and duration multiply everything. A long hot shower strips natural oils regardless of what is in the water. Hard water and heat together are harsher than either alone.
One caveat worth stating plainly. Persistent dryness, itching, flaking or irritation is not something to diagnose from a blog. Speak to a pharmacist or your GP. Water is one factor among many, and treating a skin condition as a plumbing problem wastes time.
What hard water means for your home
Different problem, different solution, and worth separating.
Hardness causes limescale. Limescale coats heating elements in kettles, washing machines and dishwashers, furs up boilers and shortens appliance life. That is a genuine cost over years, and it is the reason water softeners exist.
This is the important distinction: a shower filter does nothing about any of that. It treats the water at one outlet. Your kettle will still scale. If limescale and appliances are your concern, a plumbed-in water softener is the product, and we compared the two honestly in a separate article rather than pretending our own product covers it.
What to do about it
If you are in a hard area and it is your skin and hair that bother you: Turn the shower temperature down, shorten the shower, switch from traditional soap to a cream cleanser or syndet bar since those produce far less residue, moisturise within about three minutes of getting out, and consider filtering the water at the shower itself.
If you are in a hard area and it is limescale that bothers you: Water softener. Descale appliances regularly in the meantime.
If you are in a soft area and your skin still feels tight: Look at chlorine, water temperature, shower length and your cleanser before you look at hardness. Filtering can still help with the chlorine side, but do not buy anything expecting it to solve a hardness problem you do not have.
If you rent: Everything above except the softener, which requires plumbing work and the owner's permission.
Where VYLLO fits
The VYLLO Vitamin C Shower Filter Kit is built for UK showers and UK water. It treats the water at the point where it spends the longest in contact with you.
Two stages. Inside the handset, a core of PP cotton, activated carbon and calcium sulphite, designed to help reduce chlorine. Then an inline Lavender Vitamin C cartridge for the ascorbic acid stage and the sensory side of the shower.
It fits the standard G1/2 thread on UK mixer showers, installs by hand in under two minutes, and mounts on an adhesive bracket rather than drilled fixings, so it works for renters and comes off the wall when you move.
And the honest limit, again: it does not soften your water and it will not stop limescale. If you are in a very hard area with an appliance problem, you need both a softener and something at the shower, or you need to decide which of the two problems actually bothers you more.
Built for UK water
The VYLLO Vitamin C Shower Filter Kit arrives complete: handset with three spray modes and a pause button, inline Lavender Vitamin C cartridge, stainless steel hose, matte black adhesive bracket, PTFE tape and three PP cotton filters.
Designed for UK Hard Water · £98.99 introductory launch price
Frequently asked questions
Which areas of the UK have hard water? Broadly, southern and eastern England, including London, the south east, East Anglia and much of the Midlands. Scotland, Wales, Northern Ireland, Cornwall and much of the north west tend to be softer. Hardness can vary within a county, so check your postcode with your water supplier.
How do I find out how hard my water is? Enter your postcode on your water supplier's website. Every UK supplier publishes hardness by area, usually in milligrams per litre of calcium carbonate, sometimes in degrees Clark, along with a description such as soft, moderately hard or hard.
Is hard water bad for you? No. Hard water is safe to drink and safe to wash in, and UK water quality standards are strict. The minerals in it are calcium and magnesium. The issues it causes are practical rather than medical: limescale in appliances, and soap residue that can leave skin feeling tight.
Does London have hard water? Yes. London is generally classified as hard to very hard, because the water passes through chalk and limestone before reaching the supply.
Does soft water mean there is no chlorine? No. Chlorine is added by water companies to keep the supply safe and is unrelated to hardness. Soft water areas have chlorinated water too, which is why some people in soft water areas still notice their skin after a shower.
Will a shower filter help in a hard water area? It can help with how the water feels at the shower, because it is designed to help reduce chlorine. It does not reduce hardness, so limescale will still form in kettles and on taps. Only a water softener addresses hardness across the home.
