A $14.6 million upgrade to the Water Corporation's Onslow wastewater treatment plant is now complete, with the plant's capacity doubled to 870,000 litres per day.
Water Minister Mia Davies said the expanded plant capacity would support the long-term future growth of Onslow, which was fast becoming one of Western Australia's most significant gas hubs.
"It is expected that, over time, the demand on Onslow's wastewater infrastructure will nearly double as the population increases in the town," Ms Davies said.
"These upgrades not only improve the existing plant infrastructure but also put in place the capacity to support long-term growth and ensure a quality service for the Onslow community."
State Development Minister Bill Marmion said the upgrade formed part of the Chevron-operated Wheatstone Project's State Development Agreement and had created local jobs.
"A total of 11 local Onslow contractors worked on this project including crane hire, surveying and supplying materials and 58 people were employed over the life of the project," Mr Marmion said.
"This is a tremendous example of industry working with the State Government to deliver positive community outcomes in regional WA."
The Onslow wastewater treatment plant upgrades began in 2014, with final testing completed last month.
The Chevron-operated Wheatstone Project contributed $13.13 million to the upgrade project, with the Water Corporation funding the remaining $1.5 million.
The Chevron-operated Wheatstone project has committed more than $250m to social and critical infrastructure projects in Onslow including health, recreation and utilities
The State Government has also committed about $70m
Other projects completed to date include the redevelopment of Onslow Airport, restoration works at the old Onslow town site, construction of Onslow ring road and construction of community swimming pool