Sewage pollution levels in the Mersey estuary are as high as they were in the 1980s despite efforts to clean it up, according to a study.
Researchers from Durham University used dried seaweed to compare levels going back 200 years.
They found the River Mersey and its estuary remained heavily polluted by nitrogen from sewage and said the “shocking” levels required immediate action.
The Environment Agency said it was committed to “protecting and improving water quality”.
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The study, published in the journal Environmental Science: Advances, external, by geochemists Freya Alldred and Prof Darren Grocke used herbaria, dried seaweed, from collections which date back to the 1780s at the World Museum Liverpool.They said it was the first time herbaria had been used to show how clean rivers were.Herbaria act like time capsules, capturing in its tissues the environmental conditions it was growing in, so it can identify nitrogen pollution changes over the past 200 years.
Prof Grocke said they were “astonished” at the “elevated” results showing it was “dominated by sewage” and called for immediate action to address the issue.Of the record levels of species being recorded in the River Mersey, he said: “They’re probably sporadic and not living there all the time and just venturing in and out.”
He added: "Although that conflicts with the evidence we have, if you go round the Liverpool Mersey area you’ll see [they] don’t have many mussels and other organisms that live on the rocks… and they normally help filter the water.
"Professor of Physical Geography at the University of Manchester, Jamie Woodward, said the estuary was “a hot-spot for sewage dumping”.He said that was “unacceptable” and it was “a threat to public health”.
"Our team works tirelessly to enforce regulations, conduct monitoring, and collaborate with stakeholders to address sources of pollution.”The Mersey Rivers Trust said water quality had been improving since the late 1980s with “significant improvements in sewage treatment”.
"As a result we are seeing a lot more different species of fish in the estuary than 40 years ago and the return of shark, dolphin and porpoise.
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