A new $2 million ambulance sub centre will be built in Onslow to replace the current facilities.
State Development Minister Bill Marmion said the new centre would be funded by the Chevron-operated Wheatstone LNG project, which is under construction 12 kilometres west of Onslow.
"Through the support of Chevron Australia and the Wheatstone Joint Venture participants, the town of Onslow is being transformed," Mr Marmion said.
"Under the State Development Agreement for the Wheatstone project, more than $250 million has been committed towards a range of critical infrastructure and community projects."
Health Minister John Day said the new sub centre would be built and operated by St John Ambulance, and would replace the existing facility.
"Sub centres manage operations on behalf of St John Ambulance Western Australia at fully-run volunteer locations and play a crucial role in regional emergency response," Mr Day said.
"The current sub centre not only needs upgrading, it is also located below the town's flood level.
"This new facility will be modern, accessible in all weather conditions, and ideally located in close proximity to the new Onslow hospital, which is a great outcome for St John volunteers, staff and the broader Onslow community."
Design of the new facility has commenced, and it is expected to be operational during 2018.
The Wheatstone project has also provided $22 million towards the construction of a new hospital in Onslow, with the Liberal National Government contributing $19.8 million through the Royalties for Regions program.
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
The Wheatstone project is a joint venture between the Australian subsidiaries of Chevron, Kuwait Foreign Petroleum Exploration Company, Woodside Petroleum Limited and Kyushu Electric Power Company, together with PE Wheatstone Pty Ltd, part owned by JERA
State Development Minister's office - 6552 6800
Health Minister's office - 6552 6200