Jamie Pout, leader of the Independent Group at Dover District Council, said he had written to both the environment secretary, Steve Reed, and MP for Dover and Deal, Mike Tapp, calling for urgent action.
The latest reading was taken on the 7 July which recorded 9,900 colonies per 100ml of water, compared to the highest reading in 2024 which was 3,900 colonies per 100ml.
Mr Pout said: “Why are things getting worse? Whoever took that reading must have been forced to wade through actual human waste. This new reading is maddening.”
Speaking about the impact to the local economy, he added: “Local shops, pubs, restaurants need answers to why sewage is being dumped in the sea.”