Thames Tideway

The Thames Tideway is a major new tunnel being built under London's River Thames to upgrade the city’s existing sewer system. It is designed to capture and store excess sewage and stormwater during heavy rain, preventing untreated waste from overflowing into the river. This long tunnel, stretching over 20 miles, improves water quality, protects the environment, and supports the city's growing population. Once completed, it will ensure that London’s sewage is properly managed, reducing pollution and safeguarding both public health and the river's ecosystem for years to come.