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Pollution incidents


Although we strive to protect the environment, sewage can be released accidentally into the environment as a result of an incident such as a sewer collapse or a failure at a sewage treatment works. 

We are committed to measuring our performance against varying levels of pollution, for example, a category one pollution incident would be classed as significant and a category three incident as minor. 

This measure will identify how many times the water environment has been polluted as a result of our activities or assets.

Unit of measurement 

Current performance (21/22)

2025 target 

Incidents per 10,000km sewers