The company charged with installing a controversial broadband network through Brisbane's sewer system has been dumped.

Lord Mayor Campbell Newman today said Brisbane City Council would no longer be dealing with i3 Asia Pacific, as he was unhappy with the progress of the scheme.

Work on the sewer broadband project, designed to provide speeds of 100 megabits per second within four years, was set to start early this year.

In October last year, i3 Asia Pacific announced it would spend $600 million to set up a broadband internet service despite troubles with similar projects in England.

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The company said it hoped to provide the broadband link years ahead of the Federal Government's National Broadband Network project.

Brisbane City Council reached an agreement with the council-owned Queensland Urban Utilities in November to provide access to Brisbane's sewer network.