The Corruption and Crime Commission has charged a City of Perth senior project officer with two counts of corruption.
The charges relate to central city capital works projects.
The CCC said the alleged offences occurred between August 2011 and January 2012 and that the matter was identified by the City of Perth, which had assisted the Commission during the investigation.
"The 38-year-old woman, whose role was to oversee capital works and major projects for the City of Perth, is accused of using her position to benefit the director of a plumbing company whom she met in 2010," the CCC said.
"The 37-year-old director of the plumbing company has also been charged with one count of corruption, and is accused of enabling the senior project officer to act corruptly in order to gain a benefit.
"The plumbing company has been a regular and significant provider of services to the City of Perth since 2010."
The project officer allegedly did not follow procurement policies for two City of Perth projects, which resulted in $62,300 of fees being paid to the plumbing company.
The company director and the project officer are due to appear in the Central Law Courts on February 4.