This page lists various useful resources relating to water pollution, drought and flood
To report pollution incidents. If you see signs of pollutants being discharged, or having been discharged, into a river or stream email firstname.lastname@example.org or call the Environment Agency on 0800 80 7060 More details here. If its coming out of a drain in Cambridge, also report it asap to Anglian Water here
Environment Agency catchment data for The Cam and Ely Ouse. This gives detailed information on the health of all the rivers in the Cam catchment.
This Environment Agency map shows all the water abstraction licenses and how much each licensee is allowed to use. It is very noticeable that most of the abstraction happens in the Fens, rather than upstream of Cambridge.
All the Environment Agency’s monthly water situation reports can be seen here
WWF rivers map. This is based on Environment agency data in 2015. Areas highlighted in red have listed reasons for not achieving good water quality status
You can buy maps of Anglian Water’s surface water and sewerage drains at digdat. Annoyingly they’re behind a paywall. This one cost £35 in 2023