Five warning signs rivers are polluted even when they look clean

Overview

The article explains that rivers can look clean but still be polluted and outlines practical signs of contamination, the scale of sewage discharges, and what readers can do to monitor water quality and report concerns.

• Unusual smells, nearby discharge points, and illness after water contact
• Limited information from real-time data on pollutant concentrations
• Actions readers can take, including reporting pollution to the environmental authority

Original publisher: The Conversation.

Overview

After months of miserable weather in the UK, spring brings renewed interest in outdoor activities by rivers and lakes. While millions visit riversides every year, concerns about sewage and water pollution have grown, with warnings about contaminants from sewage systems, agricultural runoff, and urban runoff taking center stage in public and regulatory discourse. The article notes that not a single English river was free from chemical contamination and that only a small fraction—14 percent—were classified as having good ecological status at the last assessment. In 2024 alone, raw and partially treated sewage was discharged for more than 3.6 million hours, with around 15,000 sites regularly releasing effluent. The 2025 results are not expected to show substantial improvements, underscoring why people want to identify pollution signs around water.