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Kerem IsmailThe EUSR water hygiene card, better known as the Blue Card, shows you've passed National Water Hygiene training. EUSR runs the scheme, built with every UK water company. Water companies ask for it before you enter a clean water site or work on the drinking water network. Registration lasts three years. You can take the course and its 25-question test online, through our EUSR National Water Hygiene Scheme course.
No law names the Blue Card. It's a condition every UK water company sets, and on a clean water site that makes it as good as compulsory. So if your job touches drinking water, get the card before anyone asks to see it.
What the National Water Hygiene scheme is, and who runs it
EUSR keeps the register of training and skills for the utilities sector, and it's run by Energy & Utility Skills. National Water Hygiene is one of its schemes. EUSR developed it with all the UK water companies, and it first ran in 2006.
Before then, each water company ran its own hygiene scheme. A Scottish Water training lead, quoted by EUSR this year, said that created complexity and inefficiency. EUSR adds that expectations could differ from one organisation to the next, which made life harder for contractors working across several sites. The Blue Card scheme replaced all of that with one standard across England, Scotland, Wales and Northern Ireland.
The card is only the proof. What the water companies look for is your National Water Hygiene registration, which your provider sends to EUSR once you pass.
Why the scheme exists: the law on drinking water
EUSR says the scheme is there to protect public health and promote good water hygiene. The law sits behind that, but it's about the water, not the worker.
In England and Wales, section 68 of the Water Industry Act 1991 says a water company must make sure the water it supplies is wholesome at the time of supply.
Section 70 makes it a criminal offence to supply water that's unfit for human consumption. The offence can apply to the water company and to any employer or self-employed person concerned in the supply. An individual convicted in the Crown Court can face up to two years in prison.
The Drinking Water Inspectorate checks the water companies in England and Wales. On 2 June 2026, South West Water was fined a record £1.853 million under section 70. The Inspectorate said cryptosporidium, a parasite from animal faeces, likely got into the network through an exposed, faulty air valve covered in mud. Up to 39,000 people in the Brixham area were told to boil their water in 2024, and there were more than 390 customer contacts reporting illness.
That's the backdrop. The scheme itself is the shared hygiene standard the water companies set for the people who work on their water.
Who needs an EUSR water hygiene card
UK water companies require anyone entering a clean water site, or working on the clean water network, to hold a National Water Hygiene registration. EUSR calls this work restricted operations.
It isn't only water company staff. If you do restricted operations for a subcontractor, or for another organisation such as a self-lay organisation, you need the registration too.
If you're not sure whether your work counts, ask the water company or the main contractor before your first day. Expect the card to be checked before you start.
The Blue Card isn't legionella training either. Controlling legionella in a building's hot and cold water systems is a separate duty, which HSE puts on employers and people in control of premises. Our guide to legionella awareness training covers that side.
What the water hygiene course and test involve
The scheme has four modules.
- The importance of water.
- Water as a carrier of disease.
- Potential contamination and its consequences.
- Preventing contamination.
The last two cover how contamination gets in and how to keep it out. EUSR's examples are everyday ones, such as handling equipment, storing materials and looking after site welfare facilities, with personal hygiene running through all of it.
Providers can teach it face to face, live in an online classroom, or as e-learning with an online test. Every route ends in a test of 25 multiple-choice questions.
On our online course, most people finish the training and test in about 3 hours. You get 30 minutes for the 25 questions, and a free retake is included.
The health check before you start
This step catches people out. Before training, everyone fills in a health screening questionnaire. It asks whether you have, or have had in the last 12 months, any of these illnesses.
- Typhoid or paratyphoid
- Dysentery
- Persistent diarrhoea or vomiting
- Jaundice, or hepatitis A or E
- Prolonged unexplained fever
If any apply, you'll need written confirmation from a doctor, such as your GP, that you're free of the illness and its symptoms. EUSR won't register you until it has that. Get the letter before you book, so it doesn't hold up your card.
How long the Blue Card lasts, and how to renew it
Your National Water Hygiene registration lasts three years from the date you're registered.
There's no shortcut to renewing. Once the registration has expired, you take the training and the test again. EUSR says the ways of retaking it that are open to you depend on whether you work directly for a water company, and on the trainer's approval status.
Go by your registration date, not a date printed on a card, because the two don't match. Our guide to what an EUSR card is explains why. Set yourself a reminder well before the three years are up.
The digital card, and where a physical card fits
Since February 2022, EUSR has issued every registration with a virtual card as standard. It lives in an app on your phone. EUSR sends the set-up link by text, so it needs a mobile number that's yours alone.
A plastic smart card is optional, and EUSR only issues one on request. If you don't have a smartphone, or a mobile at all, a plastic card is the route instead. Tell whoever trains you, and they'll sort it out with EUSR.
On our course, you get access to your virtual card once you've passed and your registration has been processed. You can also choose a physical card posted to your home.
The Blue Card and the CSCS card aren't the same thing
The name causes mix-ups, because CSCS has its own Blue Skilled Worker card for people with a level 2 construction qualification.
| Blue Card (National Water Hygiene) | CSCS card | |
|---|---|---|
| Scheme owner | EUSR | CSCS |
| What it proves | You've passed water hygiene training for clean water work | You hold the right qualification and health and safety test for your construction job |
| Who checks for it | UK water companies, on clean water sites and the clean water network | Principal contractors and clients on construction sites |
| Required by law? | No law names it. Water companies require it | CSCS says holding a card isn't a legal requirement |
| How you qualify | Health screening, training and a 25-question test | A qualification or approved course for your job, plus a CITB health and safety test |
| How long it lasts | Three years, then retake the training | Depends on the card. The Blue Skilled Worker card lasts five years |
Details from EUSR and CSCS, accurate as of October 2026.
Neither card stands in for the other, so a job that asks for both needs both. For the construction side, read what a CSCS card is.
Where The Builders Academy fits
Our EUSR National Water Hygiene Scheme course is fully online. You get access as soon as you enrol, and you work at your own pace on any device, with no classroom or video call. It's open to anyone aged 16 or over with ID, and you don't need experience. Passing leads to registration on the EUSR and your National Water Hygiene card.
If you're booking for a crew, there's a team option, and our guide to getting a whole team carded covers the admin.
The Blue Card is a water company rule, not a law, but on a clean water site it's the rule that gets checked. If a water job is coming up, book the EUSR National Water Hygiene course before day one, not on the morning of it.
Frequently asked questions
What is a water hygiene card?
It's the card that proves you hold an EUSR National Water Hygiene registration, and most people call it the Blue Card. You get it by completing National Water Hygiene training and passing a 25-question multiple-choice test. Every UK water company uses it as a shared hygiene standard, so one card covers clean water work for any of them, rather than a separate scheme per company.
Who needs an EUSR water hygiene card?
Anyone doing restricted operations, which means entering a clean water site or working on the clean water network. That includes water company staff, subcontractors and organisations such as self-lay organisations. The requirement comes from the water companies, not from a law. If you're unsure whether a task counts, ask the water company or principal contractor before you start.
How long does a water hygiene card last?
Three years from the date of registration. After that, you renew by taking the training and test again, and the route open to you can depend on whether a water company employs you directly. Go by the registration date rather than anything printed on a virtual or plastic card, because EUSR says those dates aren't linked.
How do I get an EUSR water hygiene card?
Fill in the health screening questionnaire first. Then complete National Water Hygiene training, such as our online course, and pass the 25-question test. Your provider sends your registration to EUSR, which texts a link to your mobile so you can set up the virtual card. Make sure your provider has a mobile number that's yours alone.
Can I get the Blue Card online?
Yes. EUSR lists e-learning with an online test as one of three ways to take National Water Hygiene, alongside face-to-face and live virtual classroom training. Our course is fully online, works on any device and takes most people about 3 hours, with nothing to schedule. You need to be 16 or over and have ID, but no experience.
What does the water hygiene test cover?
It covers the scheme's four modules, from why clean water matters to how contamination happens and how to prevent it. It's 25 multiple-choice questions, and on our course you get 30 minutes with a free retake included. The training behind it covers everyday site habits, such as personal hygiene, handling equipment and storing materials, and the illnesses that dirty water can spread.
How much does the water hygiene card cost?
It depends on the provider, how the course is delivered and whether you want a plastic card as well as the digital one. EUSR charges providers a fee for each registration, and a little more when a plastic smart card is added. Employers booking several people may get a lower rate per person, so check what's included before you pay.
What is the difference between the Blue Card and a CSCS card?
The Blue Card is EUSR's water hygiene registration, asked for by UK water companies. A CSCS card shows you have the qualification and CITB health and safety test for a construction job. CSCS also issues its own blue card, the Skilled Worker card, which is a different card entirely. That Skilled Worker card lasts five years, while the Blue Card lasts three.
Kerem Ismail is Managing Director of The Builders Academy and has been helping people secure work in the construction industry since 2016.
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