Water Softener Installation
Water Softener Installation near you
Hard water is a matter of geology, and in Britain it varies sharply from one region to the next. The Drinking Water Inspectorate explains that hardness is caused by dissolved calcium and magnesium picked up from the local ground, and classifies it in milligrams per litre of calcium carbonate: soft up to 100, slightly hard from 100 to 150, moderately hard from 150 to 200, hard from 200 to 300, and very hard above 300. For an accurate figure the DWI says to ask your water company directly, because local variation is not captured by a regional map.
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What hardness does is familiar to anyone living with it. It causes scaling in hot water systems, kettles, irons and appliances, and those deposits on heating elements shorten their life and make appliances less efficient. It produces less lather from soap and detergents, leaves tide marks on basins, sinks, baths and toilets, and puts a scum on the surface of hot drinks.
What it does not do is make the water unsafe. The DWI notes that neither the Drinking Water Directive nor the UK drinking water quality regulations specify standards for hardness, calcium or magnesium. So a softener is a comfort and appliance-protection decision rather than a health one, and the DWI treats it as a matter of personal choice — which makes how it is installed, and which taps it feeds, the questions that actually matter.
Telling your water company: the notification a softener actually requires
This is the step most householders have never heard of. Regulation 5 of the Water Supply (Water Fittings) Regulations 1999 requires anyone proposing to install a water fitting in connection with any of the operations listed in its Table to give notice to the water undertaker before beginning work, not to begin without the undertaker's consent, which must not be unreasonably withheld, and to comply with any conditions attached to that consent.
Item 4(f) of that Table is the one that catches softeners: the installation of a water treatment unit which produces a waste water discharge or which requires the use of water for regeneration or cleaning. An ion exchange softener regenerates with brine and sends the rinse to waste, so it sits squarely inside that description. Item 4(e), a unit which incorporates reverse osmosis, is listed separately, and the DWI states directly that by law consumers must give notice to their water company of their intention to install a reverse osmosis system.
The process is not onerous. The notice must include the name and address of the person giving it, a description of the proposed work, particulars of the premises and their use, and normally a plan of the relevant parts of the premises and a diagram of the pipework and fitting to be installed, plus the contractor's name where an approved contractor is doing the work. The undertaker may withhold consent or impose conditions by notice given within ten working days, and if it says nothing in that period consent is deemed to have been granted unconditionally.
Where the softener goes, and the drinking tap that must stay hard
The single most important installation decision is which outlets receive softened water. The DWI's advice is unambiguous: where water is softened by base exchange it is important to provide an unsoftened outlet for drinking purposes, and if you install a softener you should make sure it is correctly installed and that you do not soften the water to the kitchen tap used for drinking and cooking.
The water fittings rules point the same way. Schedule 2 to the Water Supply (Water Fittings) Regulations 1999 requires all premises supplied with water for domestic purposes to have at least one tap conveniently situated for drawing drinking water, and requires that drinking water tap to be supplied from a supply pipe, a pump delivery pipe drawing from a supply pipe, or a distributing pipe drawing water exclusively from a storage cistern supplying wholesome water. In a normal house that is the kitchen tap, and a softener plumbed across the rising main without a hard branch to it has removed the very thing the Schedule requires.
There is also a cheaper option than softening everything. The DWI notes that installing a softener just before the hot water tank or boiler is a more economical method of preventing limescale precipitation than softening the whole supply, since scale forms where water is heated. LokalMatch is where you get that priced: describe the property, how hard your water is and what you want softened, add your postcode, and water treatment specialists covering your area get in touch, having paid for the request. LokalMatch installs nothing, sets no prices and does not vet, rank or recommend anyone who replies, so ask each of them where the drinking tap will be fed from and who is notifying your water company.
Sodium, babies and corrosion: the real cautions about softened water
Ion exchange does not remove hardness so much as trade it. Calcium and magnesium in the water are replaced by sodium, and the DWI warns that some softeners can add significantly to the sodium content of drinking water, that the drinking water regulations include a standard for sodium, and that using a softener may risk breaching that standard. It adds that a softener may alter the taste and smell of the water, making it less pleasant to drink.
Two groups need particular care. Too much sodium can be a problem for premature babies, whose kidneys are not good at filtering it out of the blood, and for people on a low sodium diet. The DWI states plainly that artificially softened water should not be used to make up baby feeds, which is another reason the unsoftened kitchen tap is not optional in a household with an infant.
There is a plumbing consequence as well. Water with a hardness value of 100 mg/l of calcium carbonate or less is more corrosive to pipework, which can lead to the dissolution of plumbing metals such as lead, copper, brass and nickel, and the DWI notes that artificially softened water may be aggressive to plumbing and cause leaching of copper and lead. In an older property with lead pipework still in place, that is a reason to think carefully about softening the whole supply rather than just the hot side.
Softeners, magnetic scale devices, jug filters and reverse osmosis
Only one of these actually softens water across the house. An ion exchange softener does, by base exchange. Lime-soda softening, where lime and sodium carbonate cause the hardness compounds to precipitate, is the other genuine softening method but is a treatment works process rather than a domestic one.
Magnetic and electronic scale devices are a different proposition. The DWI's position is that these devices do not soften the water; they are sold on the basis of producing a magnetic field that reduces scaling by altering the shape of the crystals so they adhere less to heating elements. The science behind them is based on continuous water flow and they were designed originally for large industrial systems, not for a household where the water may not flow for up to eight hours in twenty-four. If you are considering one, the DWI recommends buying only on a sale or return basis and requesting data on performance in the home setting.
Jug filters containing ion exchange resin alter only the temporary hardness of water, which is the hardness due to calcium and magnesium carbonates and bicarbonates that boiling removes as scale; they do not alter permanent hardness. Reverse osmosis removes most dissolved solids and does soften, but at a cost: it produces a waste stream equivalent to 20 to 30 per cent of the incoming flow, causes a substantial reduction in pressure, and changes the natural properties of tap water, so the DWI says RO water is not generally considered suitable for drinking and cooking unless minerals are added back, and warns that installing RO on a metered supply will increase water bills by up to one third because of the waste stream.
Keeping a softener working and hygienic
- Replenish the salt and backwash the unit regularly; the DWI singles out softeners as units where regular backwashing and salt replenishment can be very important.
- Follow the manufacturer's advice on cleaning, maintenance and the frequency of changing cartridges, because failure to do so causes a build-up of deposits, creates a breeding ground for bacteria and lets removed material leach back into the water.
- Service the unit after the property has been unoccupied for a period, which the DWI flags as a specific maintenance trigger.
- Consider a maintenance contract, which both the hardness and the filters guidance suggest, to keep the softener operating correctly and stop it becoming a hygiene hazard.
- Check periodically that the hard water branch to the drinking tap is still genuinely unsoftened, particularly after any later plumbing work in the kitchen.
- Keep the commissioning paperwork and the notice given to your water company with the property's records.
- Watch for the softener no longer softening — returning tide marks, scum on tea and poor lather are the early signs the resin or the regeneration cycle needs attention.
Signs you are in a hard water area, and what a softener will and will not change
- Scale building up on kettle elements, in the hot water system, on irons and inside domestic appliances, which shortens their life and reduces efficiency.
- Poor lather from soap, washing up liquid and washing powder, and having to use more of all three.
- Tide marks appearing on basins, sinks, baths and toilets soon after cleaning.
- A scum forming on the surface of hot drinks, which the DWI notes is especially visible in tea brewed in the cup with a teabag.
- Showers and taps furring up at the outlet, and flow at a single fitting falling away as scale narrows it.
- A softener will improve appliance efficiency and life, lathering and tide marks, which is what the DWI describes as its benefit, but it will not make tap water safer, since there is no UK standard for hardness in the first place.
What drives the cost of a water softener installation
- How hard your water actually is, which determines the size of unit and how often it regenerates.
- Whether the whole supply is softened or only the feed to the hot water system, which is the more economical approach to limescale.
- Where the rising main enters the property, and whether there is room beside it for the unit and its salt.
- Arranging a hard water branch to the kitchen tap where one does not already exist.
- Providing a drain connection for the regeneration waste, which is often the awkward part in a fitted kitchen.
- Whether servicing valves and a working internal stop tap already exist, or have to be fitted before the work can be done.
- Notifying the water undertaker and meeting any conditions attached to its consent.
- Whether a maintenance contract is taken out alongside the installation.
Water Softener Installation: frequently asked questions
Do I have to tell my water company before fitting a water softener?
Yes, in the normal case. The Table in regulation 5 of the Water Supply (Water Fittings) Regulations 1999 lists the installation of a water treatment unit which produces a waste water discharge, or which requires the use of water for regeneration or cleaning, among the operations needing advance notice. An ion exchange softener regenerates with brine and discharges rinse water, so it qualifies. The undertaker has ten working days to withhold or condition consent, and consent is deemed granted unconditionally if it does not reply.
Should I drink softened water?
The DWI advises keeping an unsoftened supply to the kitchen tap for drinking and cooking. Ion exchange replaces calcium and magnesium with sodium, softeners can add significantly to the sodium content, and the drinking water regulations include a sodium standard that a softener may risk breaching. Too much sodium is a particular concern for premature babies and people on a low sodium diet, and artificially softened water should not be used to make up baby feeds.
How hard is my water?
Hardness is measured in milligrams per litre of calcium carbonate and classified as soft up to 100, slightly hard from 100 to 150, moderately hard from 150 to 200, hard from 200 to 300, and very hard above 300. Regional maps give the general picture, but the DWI advises asking your water company directly for an accurate measurement because there are areas of local variation the maps do not represent. Water companies publish a water quality report and will provide one free on request.
Do magnetic or electronic descalers work?
They do not soften water, and the DWI says so directly. They are sold on the basis of generating a magnetic field that changes the crystal shape so scale adheres less to heating elements, but the underlying science assumes continuous flow and the devices were designed for large industrial systems rather than households, where water often does not flow for up to eight hours out of twenty-four. If you want to try one, the DWI recommends buying only on a sale or return basis and asking for performance data in a home setting.
Can I soften just the hot water and leave the rest?
Yes, and it is often the sensible choice. The DWI notes that installing a softener just before the hot water tank or boiler is a more economical method of preventing limescale precipitation than softening the whole supply, because scale forms where water is heated. It also sidesteps the drinking water question entirely, since the cold supply to the kitchen tap stays as it was, and avoids putting softened water through cold pipework that may include older plumbing metals.
Who should install a water softener?
Use a qualified plumber, and check with your water company in advance that the device meets the water fittings regulations. The DWI advises buying only from a reputable supplier, never from a door-to-door salesperson, and being wary of anyone offering to test your water to demonstrate it is contaminated, which it says should be reported to trading standards. Any product must comply with regulation 4 of the Water Supply (Water Fittings) Regulations 1999, and suppliers should be able to demonstrate that compliance.
How does LokalMatch work for a water softener?
You describe the property, your water hardness and whether you want the whole supply or just the hot side softened, add your postcode, and water treatment specialists covering your area contact you. They pay for the requests; you do not. LokalMatch does not install anything, does not set prices and does not vet, rank or recommend any business that replies, so ask each of them how the drinking water tap will be kept unsoftened, where the regeneration waste will discharge, and who is giving notice to your water company.
Sources
- Drinking Water Inspectorate: water hardness and hard water
- Drinking Water Inspectorate: domestic water filters and softeners
- Water Supply (Water Fittings) Regulations 1999, regulation 5: water treatment units requiring notice
- Water Supply (Water Fittings) Regulations 1999, Schedule 2: the drinking water tap requirement
- Water Supply (Water Fittings) Regulations 1999, regulation 4: quality, standard and workmanlike manner
- Water Supply (Water Fittings) Regulations 1999: contents
Written by the LokalMatch editorial team. Last reviewed 14 September 2026. How we write and check our guides
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What affects the cost of water softener
Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:
- Type of problem and how easy it is to find
- Access to pipes behind walls, under floors or underground
- Parts and fixtures chosen
- Age and material of the existing pipes
- Emergency, evening or weekend service
- Permits and inspections, where required
How to compare water treatment specialists before you hire
- Hire a plumber who is licensed for this work in your area, especially for gas water heaters, sewer lines and new plumbing.
- Ask whether they charge a flat rate or by the hour, and what the call-out fee covers.
- For leaks and drain problems, choose someone who explains the cause and doesn't only clear the symptom.
- Get the scope in writing for larger jobs such as a water heater, sewer repair or re-piping.
- If it's urgent, ask how soon they can arrive and whether after-hours rates apply.
Questions to ask water treatment specialists before you hire
- Are you licensed for plumbing work in my area?
- Do you charge a flat rate or by the hour, and is there a call-out fee?
- What do you think is causing the problem?
- Will this work need a permit or an inspection, and who will arrange it?
- Will you need to open walls, floors or the yard to reach the problem?
- What warranty do you offer on parts and labour?
When to call a pro for water softener
- An active leak: shut off the main water valve if you can reach it safely, then call a plumber.
- Sewage backing up into drains or the basement
- No hot water, or water pooling around the water heater
- Pipes that may have frozen during a cold snap
Water softener permits and local rules
Some water softener work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.
Permits and licensingSeasonal maintenance
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