What Does Castle Water Do?

By Olivia Johnson - Trusted UK Business Expert

Last Updated 10th of May 2025

4 minute read

If you’re a business or home looking for reliable water services, you might be wondering who Castle Water is and how they can help. We’ve created this guide to explain everything they do — in a simple, clear way.

Castle Water is a UK water retailer that supplies water and wastewater services to businesses, charities, and public sector organisations. They buy water from local suppliers and manage billing, customer service, and account management for commercial users.

That’s just the short answer. There’s much more to know about how Castle Water supports customers, saves them money, and helps the environment. Keep reading to learn more about their services and how they work.

Need a better water supplier? Click below to explore what Castle Water does and why it could be the right fit for your business.

What Does Castle Water Do?

Castle Water is a water retailer in the United Kingdom. That means they sell water and handle waste water services to businesses, not homes. Castle Water works by buying water from local water networks like Thames Water, Yorkshire Water or Scottish Water. They then deliver the service to customers across England and Scotland.

But they don’t treat the water or fix the pipes — that’s the job of the wholesaler. Instead, Castle Water takes care of billing, customer support, and helping businesses manage their water use.

They offer deals that help schools, shops, hospitals, and even farms save money. And they provide help with water efficiency, smart meters, and switching suppliers. Castle Water is one of the largest business water retailers in the UK, with over 350,000 customers.

What Services Does Castle Water Offer?

Castle Water does more than just send bills. Here’s a look at the full range of what they do:

They also work with charities and the public sector, offering flexible solutions for all kinds of organisations.

Who Can Use Castle Water?

Castle Water mainly works with:

• Small and large businesses
• Public sector organisations (like councils and schools)
• Charities and non-profits
• Farms and food businesses

They do not supply water to homes. So if you’re a householder, you’d need to go to your local water company instead.

Why Do Businesses Use Castle Water?

There are a few reasons why a business might choose Castle Water:

• Save money: By switching to Castle Water, many businesses reduce their bills.
• Better service: Castle Water focuses only on business water, so their customer support is built around those needs.
• Simple billing: For companies with more than one site, getting one bill is easier than many.
• Support for green goals: Castle Water helps firms cut water use, which is good for the environment.

How Is Castle Water Different from Wholesalers?

Some people get confused between retailers like Castle Water and wholesalers like Thames Water or Scottish Water. Here’s the difference:

Castle Water does not handle repairs or water quality issues — those are passed on to the wholesaler. But they will support you in reporting problems.

Can You Switch to Castle Water?

Yes! Businesses in England and Scotland can switch water suppliers. If you’re unhappy with your current retailer, you can move to Castle Water. They’ll take care of the switch for you. Here’s how it works:

1. You get a quote from Castle Water.
2. They compare your current rates.
3. If it’s a better deal, you say yes.
4. They manage the switch and billing change.

It’s simple and doesn’t interrupt your water supply.

What Makes Castle Water a Trusted Name?

Castle Water is trusted for a few reasons:

• They are regulated by Ofwat, which protects business water customers.
• They have good online reviews from business users.
• They publish clear service standards and aim to fix problems fast.

They’re also committed to helping customers lower their water use and reduce waste, which helps protect the planet.

What is Castle Water’s Approach to the Environment?

Castle Water encourages sustainability by:

• Offering free water-saving devices
• Giving advice on reducing waste
• Providing smart meters to track use
• Helping companies set green targets

By using less water, businesses save money and help the environment. Castle Water supports this with real tools and advice.

Does Castle Water Operate in Scotland?

Yes, Castle Water supplies businesses in both England and Scotland. They are especially strong in Scotland because they bought the business customers of Scottish Water Business Stream outside of the public sector.

So if you’re a Scottish business, you can switch to Castle Water too.

What If There’s a Problem?

Castle Water has a customer service team that handles:

• Billing issues
• Moving premises
• Changing usage
• Emergency contact with wholesalers

They have a phone number, email, and live chat, plus an online portal to track your account. If there’s ever a leak or service failure, they help report it to the right wholesaler quickly.

Ready to Learn More? If you’re thinking about switching your business water supplier or want better service, Castle Water might be the right choice. Click the link below to see how Castle Water can help your business.

FAQ

Does Castle Water supply homes?

No. Castle Water only serves business customers, not households.

Can I switch to Castle Water if I have more than one site?

Yes. Castle Water offers consolidated billing for businesses with multiple locations.

Will switching interrupt my water supply?

No. The water keeps flowing from your wholesaler — Castle Water just takes over the billing and support.

How do I contact Castle Water?

You can contact them by phone, email, or live chat. They also have an online account portal.

What if I’m not happy with the service?

Castle Water has a complaint process and aims to resolve issues quickly. They are regulated by Ofwat to make sure customers are protected.