The Mersey has never been known for being the cleanest of England's rivers: in the mid-1980s, the Mersey Estuary was declared the most polluted estuary in the UK. But today it is cleaner than it has been for more than a century, and a series of projects from United Utilities is about to improve matters still further. UU is currently undertaking a massive programme of work to improve wastewater treatment and the sewer network in the Mersey catchment area. This includes an ambitious £2OoM extension (now nearing completion) to Liverpool's wastewater treatment works at Sandon Dock.
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