The water firm is building a new 5km pipeline from Mere Plant pumping station to Bowdon wastewater treatment works, as part of an environmental improvement scheme.
United Utilities will aim to have the project complete in time to benefit wintering birds nesting in the Mere from 2018 onwards.
Project manager Jonathan Clarke said: “We take our environmental responsibility very seriously and we have designed a sustainable solution to help improve the water quality in Rostherne Mere.
“We are working with Natural England to ensure we use appropriate working methods and our engineers have worked for over two years planning the project.
“Following consultation, we made several redesigns of the scheme and the selected pipeline route will follow the line of an existing pipe, which will minimise the impact on the environment and our customers.
“We have presented our plans to Rostherne Parish Council and this public exhibition will allow us to discuss the project in more detail with the local community.”