Southern Water pleads guilty to River Test pollution

Southern Water has pleaded guilty to charges of polluting the River Test, one of England's most celebrated chalk streams, in a case that campaigners say demonstrates the systematic failure of water companies to protect the country's most precious aquatic environments.

The company admitted causing an unauthorised discharge of untreated sewage into the river near Southampton, an incident that killed hundreds of fish and caused significant damage to the river's ecosystem. The Environment Agency, which brought the prosecution, said the discharge was the result of a failure in the company's treatment infrastructure that should have been identified and addressed before it caused harm.

The River Test is a site of special scientific interest and is internationally recognised for its trout and salmon fishing. Chalk streams, of which there are approximately 200 worldwide — most of them in England — are among the rarest freshwater habitats on Earth, and their ecological value is comparable to that of tropical rainforests.

Southern Water faces a substantial fine when it is sentenced later this year. The maximum penalty for water pollution under current legislation is unlimited, and the Environment Agency has indicated it will seek a penalty that reflects the seriousness of the harm and the company's financial resources.

The guilty plea is the latest in a series of prosecutions of water companies that have been accused of prioritising dividend payments and executive bonuses over environmental protection. The government has said it expects the water industry to fund the investment needed to eliminate sewage pollution from its own resources, rather than passing the cost to customers or taxpayers.