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The Gaywood River Revival group found high E. Coli levels at Derby Fen after a month of sewage releases from Anglian Water's storm overflow at Grimston. Tests showed elevated ammonia and phosphate levels, which can harm human health and the ecosystem.

Anglian Water is allowed to use storm overflows during extreme rainfall but faces fines for releasing sewage in dry conditions. Recent maps indicated multiple storm overflows activated across Norfolk. Anglian Water claims to have invested in infrastructure improvements, but campaigners question their effectiveness, citing ongoing untreated sewage discharges.