An inquiry into the troubled City of Perth has already uncovered "a large number of very serious matters" that are complex and appear to be endemic.

During the discovery phase, the inquiry has collected 2.9 million electronic documents, 22 archive boxes and almost 90 electronic devices.

It has also spoken with 44 people and used its coercive powers to issue 35 notices to require people to produce documents and information.

More to come.

AAP