Castle Water Logo

Trusted by over 250,000 UK customers to provide better business water services

We’re the UK’s largest independent business water retailer, providing market-leading water services to businesses of all sizes, from large multi-site customers with complex needs to SMEs, start-ups, and sole traders.

We started with a mission and a handful of people. 10 years on we are a team of over 450 people driven by our values of integrity, transparency, and fairness at the core of every action, and united by a culture of collaboration, trust and a pro-active approach to problem solving.

This year we’re celebrating 10 years of defining the business of water. As we continue to grow, we remain at the forefront of the UK water market, focused on providing all our customers with award-winning customer service.

You have a choice

Since the deregulation of the business water market, if you run a business, public body or charity in England or Scotland, you can choose your water and wastewater retailer, similar to how choose your energy or telecoms provider.

Years of Experience
0 +
0 +

We are wholly independent

Unlike most water retailers, we’re not associated with any water network owners. We are wholly independent, able to challenge network owner decisions and work proactively with them to give you the right service, at the right price.


Wholesalers are designated companies responsible for owning and managing the pipelines, mains, and treatment facilities. They distribute water and wastewater services to retail suppliers.


Water retailers provide water and wastewater services tailored to individual business needs, optimising functionality and sustainability in commercial operations.


Customers are UK businesses that are eligible to select their own water retailer in accordance to their preferences. This ensures every business receives the water services they desire.

person in lab coat pouring liquid into a bottle

What makes us different

Businesses use millions of gallons of water every day; we help our customers to understand their business water usage so they use only what they need to and save money on water bills. 

Our free advice and practical resources make it easy to find ways to use water more efficiently all year round. For businesses going the extra mile, there’s our additional water management services including Automatic Meter Reading (AMR), water efficiency audits, contingency planning, and leak detection and repair.

Our commitment


We are one of the region's leading employers, providing training, skills development, career opportunities and apprenticeships for hundreds of local people.


We're committed to environmental protection through initiatives like installing 4,500 free AMR devices, drought resilience projects and paperless billing. We continuously strive to enhance the sustainability of our business practices while empowering our customers to do the same.

Giving back

Castle Water supports various charitable causes, and employees fundraising for causes that matter to them, through event sponsorship, participation, and active fundraising, reflecting our commitment to community impact.

Our history

Castle Water timeline infographic

Meaningful partnerships

Our industry partnerships help us to reach a wide variety of business communities to understand the unique opportunities and challenges they face so that we can offer even more ways to provide better business water services.

Giant's Live Logo White
Bowls Scotland logo
NFUS logo
Play Video

What our customers say about us