London River Health Map

The Mayor's Clean Rivers and Waterways Plan

Published On: 4th November 2026

The map here is presented by the GLA City Intelligence Unit on the state of London’s rivers.

It follows the launch of the Mayor’s Clean Rivers and Waterways Plan in July 2026, as in our update of 5th August.

The map will help you understand the health of your local river.

Development of this map is ongoing, so please send any feedback to the GLA Environment team.

Misconnected sewers is one of the causes of river pollution and activity on that since 2025 is described here.

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The Mayor's Clean Rivers and Waterways Plan

London River Health Map

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