Dwr Cymru Welsh Water is investing £4.5 million in environmental improvements in Whitchurch.
The utility company will begin work in early August to upgrade the existing waste water treatment works which includes modernisation of the pumping station, sand filters, installation of a kiosk and associated pipework.
The completed scheme will make the the network perform better and improve the quality of any storm water which enters the local watercourse during storm weather conditions.
This in turn will benefit the quality of the river water, helping aquatic life and the environment in general.
Work will take place inside the grounds of the existing pumping station, off the A525 Whitchurch to Wrexham road.
The scheme is expected to be finished by the end of April 2010.
Dr Cymru said although every effort will be made to minimise disruption, residents may notice a slight increase in traffic and noise.
Clara Hughes, the company’s communications representative, said: “This essential scheme reflects our ongoing commitment to invest in our wastewater network for the benefit of our customers and the local environment.
“We would like to thank local residents and businesses, particularly those nearest to the pumping station, for bearing with us whilst work is carried out.”