8.2 The Water Supply (Water Fittings) Regulations 1999
Key Takeaways
The Water Supply (Water Fittings) Regulations 1999 (SI 1999/1148) came into force on 1 July 1999 in England and Wales and sit under the Water Industry Act 1991
Regulation 3 bans installing, arranging or using a fitting that causes or is likely to cause waste, misuse, undue consumption or contamination of water, or erroneous measurement — including damaged, worn or faulty fittings
Regulation 5 notification triggers include a bath over 230 litres, a pump or booster drawing more than 12 litres per minute, an RPZ valve, and a pond or pool over 10,000 litres with automatic top-up
If the water undertaker does not respond to a notification within 10 working days, consent is deemed granted unconditionally
The water undertaker enforces the Regulations in its area, and breaches can mean required alteration or prosecution
What the Regulations Are
The Water Supply (Water Fittings) Regulations 1999 (SI 1999/1148) came into force on 1 July 1999 and apply to England and Wales. They sit under the Water Industry Act 1991 and are the legal baseline for every water fitting installed, altered or used on a supply of water from a water undertaker — the plumbing in houses, hospitals and factories, and the connections in between. Scotland and Northern Ireland have their own equivalent water fittings byelaws and regulations. For the Blue Card you need working awareness, not lawyer-level recall: the course ties your hygienic site behaviour to these legal duties.
Regulation 3: The Core Prohibitions
Regulation 3 provides that no person shall install, alter, disconnect or use a water fitting conveying or receiving water supplied by a water undertaker — or cause or permit anyone else to — in contravention of the Regulations. More importantly for the assessment, no water fitting shall be installed, connected, arranged or used in a manner that causes, or is likely to cause:
- waste of water supplied by a water undertaker;
- misuse of water;
- undue consumption of water;
- contamination of water supplied by a water undertaker; or
- erroneous measurement of water — anything that makes a meter read wrongly.
The same prohibition covers fittings that are damaged, worn or otherwise faulty: leaving a known faulty fitting in service is itself a breach, not just a maintenance backlog. Note the words "likely to cause" — you do not need an actual contamination event, or water pouring down the road; a credible risk is enough.
Regulation 4: The Material and Workmanship Duty
Regulation 4 backs up regulation 3 with the positive duties covered in section 8.1: every fitting must be of an appropriate quality and standard, suitable for its circumstances, compliant with Schedule 2, and installed, connected, altered, repaired or disconnected in a workmanlike manner. Wasting water through a bad joint and contaminating it through a bad washer are both breaches of the same legal framework.
Who Enforces
The water undertaker enforces the Regulations in its area — the same company whose mains you are protecting. Enforcement powers include requiring alterations to non-compliant work, and breaches can end in prosecution. Keep this at awareness level: what matters on site is that the law sits behind everyday choices.
Why the Blue Card Cares
The National Water Hygiene course and its 25-question assessment keep returning to one principle: nothing you do may contaminate the water supply. Regulation 3 is that principle written into law. When you cap and disinfect an open pipe end, protect a trench overnight or refuse an unapproved fitting, you are not following site etiquette — you are preventing the contamination limb of regulation 3.
Regulation 5: Tell the Water Undertaker First
For the operations listed in the Regulations, advance notice to the water undertaker is mandatory: before installing the fitting you must give notice, you must not begin the work without consent, and you must comply with any conditions attached to that consent. Consent must not be withheld unreasonably. The listed operations share a theme — they are the ones that can waste, misuse or contaminate a supply, or place unusual demands on it:
| Trigger in the Table | Number to remember |
|---|---|
| A bath | Over 230 litres, measured to the centre line of the overflow |
| A bidet | With an ascending spray or flexible hose |
| A single shower unit | Connected to a supply pipe of a type specified by the regulator (not a safety drench shower) |
| A pump or booster | Drawing more than 12 litres per minute |
| A unit incorporating reverse osmosis | Any such unit |
| A water treatment unit | Producing a waste water discharge or requiring water for regeneration or cleaning |
| Backflow protection | An RPZ valve or other mechanical device protecting against fluid category 4 or 5 |
| A garden watering system | Unless designed to be operated by hand |
| A water system laid outside a building | Less than 750 mm or more than 1350 mm below ground level |
| A pond or swimming pool | Over 10,000 litres, designed to replenish automatically |
| Building and use changes | Erection of a building; extension or alteration of a water system on premises other than a house; material change of use |
The 10-Working-Day Rule
If the water undertaker does not respond within 10 working days of the notice, consent is deemed to be granted unconditionally and the work may proceed. The rule keeps the notification system moving — but the notice must actually have been given first.
Regulation 6: The Completion Certificate
Where the work is done by an approved contractor, the contractor must, on completion, give the person who commissioned it a signed certificate stating whether the fitting complies with the Regulations, and send a copy to the water undertaker where the fitting needed notice under regulation 5.
Site Scenario: The Booster Pump That Skipped the Paperwork
A site team fits a booster pump drawing 18 litres per minute to cure a poor shower flow in a block of flats, without notifying the water undertaker. The pump itself is approved and expertly installed — but a pump drawing more than 12 litres per minute is a listed operation, the notice was never given, and the work is non-compliant regardless of its quality. The correct sequence was: notice, consent (or 10 working days elapsing), installation, certificate.
One-Line Recap: Fluid Categories
Chapter 4 introduced the Schedule 1 fluid categories 1 to 5. The principle that matters here is that the fluid category determines the backflow protection required — which is exactly why RPZ valve assemblies, protecting against fluid category 4, appear in the notification table above.
Common Traps
- "Notification applies only to new builds." The Table also covers extensions and alterations of water systems on premises other than a house, material changes of use, and individual fittings such as large baths and booster pumps on existing properties.
- "Consent is needed for every single fitting." Notification applies only to the listed operations; routine like-for-like repairs and maintenance are not in the Table.
- "Every RPZ valve needs advance notice." Regulation 5(2) exempts an approved contractor installing an RPZ valve or similar device, a bidet with an ascending spray or flexible hose, or an alteration to a water system on premises other than a house. Anyone else must notify first.
- "The Regulations only bind water companies." They bind installers, owners, occupiers and anyone who causes or permits non-compliant work — including subcontractors on Restricted Operations.
Which of the following is an operation listed for regulation 5 notification?
Constructing a garden pond holding over 10,000 litres designed to replenish automatically
Replacing a worn tap washer in a domestic kitchen on a like-for-like basis
Installing a bath of exactly 230 litres measured to the centre line of the overflow
Fitting an external stop tap at the boundary of the property
A contractor gives the water undertaker notice of an RPZ valve installation and hears nothing back. What is the position after 10 working days?
Work may not start until a signed consent document arrives from the undertaker
The contractor must re-submit the notice and restart the waiting period
Consent is deemed to be granted unconditionally and the work may proceed
Consent is deemed granted subject to the standard conditions set by the regulator
Regulation 3 prohibits installing, arranging or using a water fitting in a manner that causes or is likely to cause which of the following?
Any increase in water pressure within the undertaker's distribution main or service pipes
Waste, misuse, undue consumption or contamination of water, or erroneous measurement
Noise nuisance to neighbouring properties at unsocial hours
Any reduction in the resale value of the premises served
Sections you finish are checked off in the contents.