What Castle Water does

Castle Water Limited is a privately held, Scotland-incorporated (SC475583) water retailer founded in 2014, headquartered in Blairgowrie with a regional office in London opened in 2017. It operates as the UK's largest independent business water retailer, licensed to supply water and wastewater services to commercial customers in England and Scotland following the 2017 deregulation of the English business retail market, in which Castle Water was the first independent entrant. The company serves more than 250,000 business customers — spanning small businesses, large enterprises (over 6,000 m³ annual consumption), multi-premise operators, industrial users (including manufacturing, food & drink, brewing, chemicals, mining, pharmaceuticals), and the public sector — and processes in excess of 1 million water, wastewater and trade effluent bills each year.

The core technology stack is a cloud-based customer portal and billing platform integrated with MOSL (Market Operator Service Limited), providing real-time consumption data, consolidated multi-premises billing, automatic meter reading (AMR) telemetry via partners such as Metering Technology Solutions, and a proprietary Bill Validation Tool that uses algorithms to detect billing anomalies. Modular value-added services include AMR, Limpet Readers (photographic meter capture), leak detection and repair via M&S Water Services, trade effluent consent management (Mogden-formula billing), the WaterTight assured-response contingency service via Water Direct, and water efficiency audits. Operational KPIs reported include a 98.26% Market Performance Standards score (leading among large retailers per MOSL) and a 96% meter-reading success rate.

Castle Water monetises via subscription-style recurring fees on water and wastewater supply, transaction-based trade effluent charges, and managed-service or professional-service fees for the modular add-ons. Pricing is quote-based (not publicly disclosed) with monthly billing in arrears and no advance payments; the company advertises up to 80% savings on fixed water charges. Go-to-market combines a sales-led motion (online quote tool, inside sales, dedicated trade effluent and enterprise account-management teams) with channel partners (Crown Commercial Services framework for public sector, Dukefield, and a network of implementation partners). The company has consolidated the market via acquisitions of Cobalt Water (June 2017), Invicta Water (May 2018), Affinity For Business (merger March 2020), and Brightwater (completed February 2025), and reports ISO/IEC 27001 and ISO 9001 certifications. CEO is John Reynolds OBE, with Graham Edwards as co-founder and director.

Name

Castle Water

Legal name

Castle Water Limited

Website

https://castlewater.co.uk

Company type

Private

Founded year

2014

Operating status

Operating

Headcount range

251–500 employees

Short description

Castle Water is the UK's largest independent business water retailer, supplying water, wastewater and trade effluent services to more than 250,000 commercial customers across England and Scotland via a cloud-based billing platform and modular value-added services.

Ownership category

akta.pro rank

Product category

Business Water Retail

NAICS

Water, Sewage and Other Systems (2213), Water Supply and Irrigation Systems (221310)

SIC

Water Supply (4941), Totalizing Fluid Meters & Counting Devices (3824)

akta.pro primary industry

Third-Party Water Retailing & Managed Billing Services (outsourced billing, white-label retail operations) (EUANAIAL)

Keywords

• Business water supply
• Water retail services
• Trade effluent management
• Wastewater management
• Water efficiency services

Headquarters

HQ city

Perth

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Business Water Supply: Castle Water charges businesses for water supply services, with pricing based on fixed charges and volumetric consumption. The company claims businesses can save up to 80% on fixed water charges by switching. They offer monthly billing in arrears with no advance payments required.
2. Wastewater Management Services: Charges for wastewater services are combined with water supply in consolidated billing for multi-site customers. Pricing varies based on consumption volumes and site-specific requirements.
3. Trade Effluent Services: Specialized services for businesses discharging trade effluent, including consent applications, compliance support, and negotiated consent limits. Trade effluent charges are calculated using the Mogden formula based on contamination strength. Castle Water is recognized as market leaders in trade effluent billing.
4. Automatic Meter Reading (AMR) Services: AMR installation and monitoring services provided through partnership with Metering Technology Solutions (MTS). Provides real-time consumption insights and leak detection capabilities for an additional service fee.
5. Leak Detection and Repair Services: Leak detection and repair assistance provided through partnership with M&S Water Services. Includes site surveys, flow rate monitoring, and repair services for a fee.
6. Emergency Water Supply Services: Alternative water supply services during emergencies including tankered water, bottled water, and temporary storage tank hire, provided through partnership with Water Direct.

Pricing tiers

Go-to-market motion3 records

Distribution channels5 records

Marketing channels7 records

Core offering

Castle Water is the UK's largest independent business water retailer, supplying water and providing wastewater and trade effluent services to over 250,000 businesses in England and Scotland. Its core offering is the licensed retail supply of water combined with consolidated billing for multi-site customers, supported by value-added services such as automatic meter reading, water efficiency audits, leak detection, and trade effluent consent management.

Product overview

Castle Water offers a unified business water retail platform for UK businesses, charities, and public bodies in England and Scotland. The core offering is business water supply and wastewater management, supplemented by a modular suite of value-added services including water management plans, management systems, trade effluent services, automatic meter reading (AMR), limpet readers, leak detection, contingency planning, water efficiency audits, bill validation tools, and water saving devices. These services are delivered through a customer portal (Castle Water Portal) and a dedicated AMR portal. The company services over 250,000 customers and is positioned as the UK's largest independent business water retailer.

Differentiator

Problem solved

Functional benefit

Products and services

• Business Water Supply Core licensed water and wastewater supply service for UK businesses, offered to small, large, and multi-premises organizations with consolidated billing and monthly billing in arrears.
• Trade Effluent Services Comprehensive trade effluent management including consent applications, bespoke consent limit negotiation, compliance support, and billing using the Mogden formula based on contamination strength, delivered by a dedicated in-house trade effluent team.
• Wastewater Management Advisory and management services for wastewater treatment and disposal, tailored by industry with solutions including anaerobic digesters, chemical treatment, filtration, and greywater recycling.
• Automatic Meter Reading (AMR) Remote meter reading devices that attach to existing water meters, installed in partnership with Metering Technology Solutions, providing real-time consumption data, hourly readings, automatic leak alerts and consumption reports via a dedicated AMR portal.
• Limpet Readers Budget-friendly meter reading device that attaches to existing water meters, photographs the meter dial, converts the image to numerical data, and transmits readings to a database on a scheduled basis.
• Leak Detection and Repair Leak identification and repair service using acoustic correlation, ground microphones, flow and pressure logging, and step testing, delivered through partnership with M&S Water Services.
• Contingency Planning and Water Continuity (WaterTight) Bespoke contingency planning for water supply interruptions including site assessments, water usage profiling, action plan development, and the industry's first dedicated assured response service with on-site emergency water support within 4 hours, delivered in partnership with Water Direct.
• Water Efficiency Audits Tailored on-site water audits providing usage analysis, compliance support, and recommendations for reducing consumption to support ESG and CSR reporting goals.
• Bill Validation Tool Software solution using algorithms to identify billing errors, overcharges, and inconsistencies across water and wastewater invoices, with reporting and data export capabilities.
• Water Management Plan Structured water management planning service providing businesses with assessment, compliance support, consumption monitoring, and cost-effective strategies for reducing water use.
• Water Management Systems Advanced monitoring systems using sensors and real-time data to identify leaks and inefficient processes, turning usage data into actionable management plans.
• Water Saving Devices Physical water-saving products including tap aerators, leak detection kits, and water-efficient fixtures to reduce consumption and lower bills.

Quantifiable outcome

• Save up to 80% on fixed water charges
• +5 more outcomes

Named customers7 records

Segments7 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Nine partnerships are on record, tiered core, strategic and minor.

• M&S Water ServicescoreImplementation/ SI/ Consulting PartnerPartnership for leak detection, repair, and assistance services. M&S Water Services provides highly trained leak detection specialists who use equipment including acoustic correlation and ground microphones to pinpoint leak locations. They offer flexible scheduling including out-of-hours work.
• Metering Technology Solutions (MTS)coreImplementation/ SI/ Consulting PartnerPartnership for Automatic Meter Reading (AMR) installation. MTS has extensive experience installing AMR equipment for a broad range of businesses. Installation takes less than an hour without impacting normal operations.
• Water DirectcoreImplementation/ SI/ Consulting PartnerPartnership for emergency water supply services including tankered water, bottled water, and temporary storage tank hire. Water Direct operates a 24/7 emergency response team and provides the WaterTight assured response service with on-site support within 4 hours.
• DukefieldstrategicStrategic or Co-development PartnerStrategic partnership to streamline water services for the public sector. Castle Water and Dukefield collaborate to provide comprehensive water management solutions to government organizations.
• Giants LiveminorGTM or Marketing PartnerStrongman event sponsorship now in its fourth year. Partnership includes brand visibility at events and collaborative marketing activities.
• Bowls ScotlandminorGTM or Marketing PartnerSponsorship of Bowls Scotland National Championships and World Water Day 2025 collaboration. Partnership focuses on water efficiency awareness and sustainable sponsorship.
• Cateran YompminorGTM or Marketing PartnerMain sponsor of the Cateran Yomp hiking event for over 6 years. Company employees participate in the event raising funds for Army Benevolent Fund. Partnership includes fundraising and team building activities.
• Dundee and Angus Chamber of CommerceminorGTM or Marketing PartnerPlatinum Partnership with Dundee and Angus Chamber of Commerce announced in January 2024. Provides networking opportunities and community engagement.
• Crown Commercial ServicesstrategicChannel Partner/ Reseller/ DistributorListed as an approved supplier on the Crown Commercial Services framework, enabling public sector organizations to procure Castle Water's water retail services.

Scale indicators10 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• Severn Trent plc: Vertically integrated water and wastewater group that owns Source for Business and Water2Business. Operates a wholesale regional monopoly while competing via its retail arms in the same non-household market served by Castle Water, giving it both cost and conflict-of-interest advantages.
• United Utilities: Vertically integrated water group whose Water Plus JV is the most direct wholesaler-affiliated competitor. Comparable because it controls regulated network assets in the North West while simultaneously competing with Castle Water for the same business retail customers in those regions.
• Pennon Group (South West Water): Integrated water utility group whose South West Water/Bristol Water businesses combine wholesale and retail roles. Comparable as a regional incumbent that competes with independent retailers like Castle Water within its territories while leveraging wholesale control to shape market economics.

Direct peers

• Source for Business: Severn Trent's branded business water retail arm selling water and wastewater services to UK commercial customers. Direct competitor: similar product set, multi-site billing and trade effluent capability, and a like-for-like switching proposition versus Castle Water's offering.
• Water2Business: Severn Trent subsidiary operating as an independent-licensed retailer serving business customers in England. Competes with Castle Water on the same deregulated customer base with an emphasis on switching and consolidated billing for SMEs and larger sites.
• Water Plus: Joint venture between United Utilities and Severn Trent; the UK's largest combined water retailer serving business customers in England and Scotland. Competes head-to-head with Castle Water on the same deregulated non-household market with overlapping products (water supply, wastewater, trade effluent) and similar switching-driven GTM.
• Business Stream: Scottish-licensed business water retailer serving customers in Scotland; directly comparable to Castle Water's Scottish operations, offering supply, wastewater and trade effluent services under the same deregulated framework.

Emerging players

• Everflow Water: SME-focused multi-utility reseller (water, gas, electric) targeting UK small businesses with consolidated billing and switching. Comparable to Castle Water's small-business segment via similar self-serve online quote tools and competitive switching claims.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UC8EEHW2y1sL8SVb0-_2Kc8A
• Facebookfacebook.com/CastleWater.LP
• LinkedInlinkedin.com/company/castle-water-ltd
• Instagraminstagram.com/CastleWaterOfficial
• Xx.com/castlewaterltd

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Castle Water