The project will be delivered by Land and Marine Engineering, a wholly owned subsidiary of Murphy.
The works form part of United Utilities’ £100m investment to improve the sewer network along the Fylde Coast over the next five years.
Brian Sharp, United Utilities Senior Project Manager for Harrowside, said: “This year, bathing waters will be judged for the first time against the new stringent European bathing water laws.
“All of Fylde’s bathing waters passed the previous standards so we’ve come a long way in improving water quality but the stricter directive means we all need to do more.
“We look forward to working with Murphy and Land & Marine to support us in delivering this significant contract”.
Andrew Ball, Land & Marine Managing Director, said: “With a vast experience of delivering projects of this nature, we look forward to working with United Utilities and all other stakeholders to successfully deliver the Harrowside works”.