UK Water Companies Rake in £340m from Wastewater Trade 2026

UK water companies made more than £340m last year by accepting billions of litres of industrial wastewater into sewage treatment works that experts say are ill-equipped to remove most chemicals, allowing pollutants to enter rivers, seas, and farmland. This wastewater trade operates with minimal oversight, raising serious environmental concerns.

What Is the Wastewater Trade?

Under UK law, water companies must accept industrial wastewater and issue permits called trade-effluent consents that allow businesses to discharge waste into public sewers. However, there is no independent regulator overseeing this process and no central register. A recent investigation by Watershed Investigations, the Guardian, and River Action compiled a database of 26,000 consents, providing the first national picture of the system.

Key Findings of the Investigation

• 608 billion litres of industrial wastewater entered sewage works annually from power stations, pharmaceutical plants, food factories, hospitals, abattoirs, and waste facilities.
• Water companies themselves issue and enforce the permits, with environmental regulators having no direct role.
• Most sewage works rely on biological treatment, which is not designed to remove industrial chemicals such as flame retardants, PFAS, solvents, and pharmaceuticals.
• The trade generated over £340m in revenue for water companies last year.

Why the System Is Called a 'Black Box'

Industry experts describe the trade-effluent process as a “black box” because of its lack of transparency and independent oversight. Water companies can refuse applications, but there is no central register of permits, making it difficult to track what is being discharged and where. This opacity allows potentially harmful substances to pass into the environment unchecked.

Environmental and Public Health Risks

The chemicals found in industrial wastewater, including PFAS (forever chemicals), flame retardants, and pharmaceuticals, can persist in the environment and accumulate in wildlife and humans. These pollutants can contaminate drinking water sources, harm aquatic ecosystems, and enter the food chain through crops irrigated with contaminated water.

Comparison of Wastewater Treatment Capabilities

The Need for Reform

Campaigners are calling for an independent regulator to oversee the wastewater trade and a centralized register of permits. Without such measures, the true extent of pollution remains unknown, and water companies continue to profit from a system that prioritizes revenue over environmental protection.

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