Thames Water concludes two-year pollution investigation

Thames Water has tracked down the sources of significant pollution in a North London stream

Costons Brook pollution from misconnected wastewater
Thames Water's efforts had a dramatic impact on the stream, as seen in these before and after photographs

Thames Water has tracked down the sources of significant pollution in a North London stream.

It found that a total of 64 properties in Northolt were plumbed into surface water drainage, leading into the Costons Brook, a tributary of the River Brent, which itself flows into the Thames.

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