Hard water in Market Harborough: what it means for your home

Short answerMarket Harborough's drinking water comes from Severn Trent, and independent estimates for LE16 range from about 177 to 300 mg/l calcium carbonate, which is moderately hard to hard, so limescale on kettles, showers and boilers is common. Check your exact figure with Severn Trent's postcode checker. A fitted water softener typically costs around £600 to £1,250, and you should keep an unsoftened tap for drinking.

If your kettle furs up fast, you're not imagining it. Hard water in Market Harborough affects more than the kettle: showerheads, taps, glass shower screens, washing machines and boilers all suffer from limescale over time.

This guide covers who supplies the water here, how hard it is (and why the figures you see online differ), how to check your own postcode, and the honest pros and cons of the fixes, from vinegar to a full water softener.

Who supplies water in Market Harborough?

Severn Trent supplies drinking water to Market Harborough. Harborough District Council's water cycle study describes the area as predominantly served by Severn Trent for water supply.

Wastewater is a different story. Anglian Water provides wastewater (sewerage) services in much of the town, and a few newer developments have their own wastewater provider. So you might deal with one company for your tap water and another for drains and sewers. Your bills will show which is which.

How hard is Market Harborough's water?

Hardness comes from calcium and magnesium dissolved from the rocks the water passes through. It's usually measured as milligrams per litre (mg/l) of calcium carbonate, or in Clark degrees, which is how Severn Trent reports it.

We haven't found a single published Severn Trent figure for the whole of LE16, and independent sites don't agree:

• one hardness site lists LE16 at around 177 mg/l, which it describes as moderately hard
• another lists Market Harborough at around 300 mg/l, which would be very hard

Hardness varies between supply zones and can change if a zone's source changes. So treat any single number with care, including both of these.

Check your own postcode

The reliable way is Severn Trent's water quality checker on its website: enter your postcode and it shows the hardness for your supply zone. Write it down; your plumber, boiler engineer and any softener supplier will all ask.

Is hard water bad for you?

No. The Drinking Water Inspectorate and Severn Trent both say hard water isn't harmful to health. Many people prefer the taste. The problems are practical and financial: limescale.

What limescale does to your home

• Kettles and showerheads fur up and slow down.
• Taps, screens and tiles get chalky marks.
• Washing machines and dishwashers need more detergent and descaler.
• Electric showers and immersion heater elements can scale up and lose efficiency.
• Boilers, especially combis, can build up scale in the heat exchanger, which reduces efficiency and can cause noise and faults. Many boiler manufacturers expect a scale reducer to be fitted in hard water areas, so ask your Gas Safe engineer whether yours has one (see plumber or gas engineer: which do I need).

Your options, from cheapest up

1. Regular cleaning

White vinegar or citric acid dissolves limescale. Soak showerheads, wipe screens after use, and descale the kettle regularly. Cheap and effective for surfaces, but it doesn't protect pipes or appliances.

2. Filter jugs and tap filters

Good for drinking water, tea and coffee. They don't help the rest of the house.

3. Scale reducers and inhibitors

Small in-line devices, often fitted on the cold feed to a combi boiler. Some dose a tiny amount of polyphosphate to stop scale forming; others are magnetic or electrolytic. Evidence for the magnetic types is mixed, so ask what the boiler manufacturer requires before buying.

4. A water softener

An ion-exchange water softener is the only option that actually removes the hardness. It swaps calcium and magnesium for sodium using a resin, regenerated with salt.

Pros: no new limescale, softer feel, less detergent, protects appliances and boiler.

Cons: upfront cost, ongoing salt, space under the sink or in a garage, and softened water isn't recommended for drinking, especially for babies' feeds or anyone on a low-sodium diet.

Keep a drinking tap. The Drinking Water Inspectorate advises keeping an unsoftened supply to the kitchen tap for drinking and cooking. A good installer will plumb this in as standard, either leaving the kitchen cold tap on hard water or fitting a separate drinking tap. Any softener must comply with the Water Supply (Water Fittings) Regulations 1999, so use a competent plumber. WaterSafe-approved plumbers can certify that.

What does a water softener cost?

From 2026 UK cost guides:

• Installation labour: around £150 to £600, with Checkatrade giving a typical fitting fee of about £350
• Softener unit: from around £500 for a basic single-cylinder unit
• All-in fitted: MyJobQuote's average is about £1,250; other guides give £600 to £2,000 for a 3 to 4 bed house
• Salt: roughly £5 to £10 a month, depending on usage and hardness

Plumbing in a softener is usually a 2 to 4 hour job if there's a sensible spot near the incoming main. Costs rise if the stopcock is somewhere awkward or pipework needs rerouting. These are national ranges, not quotes; the exact price comes from the plumber's quote.

Is a softener worth it in Market Harborough?

It depends on your exact hardness, how long you'll stay, and what you're protecting. A new boiler, a new bathroom (see bathroom installation costs) or lots of glass and chrome make the case stronger. If you just want better tea, a filter jug will do. If you're unsure, ask a plumber to look at where it would go and quote before you decide.

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