The funding is a new partnership between the Federal and State governments under the Tourism Demand Driver Infrastructure (TDDI) program.
Key WA tourism projects, including Mersey Point Jetty, will receive more than $5 million over four years.
WA Tourism Minister Kim Hames said the program would see some exciting projects take off and make WA even more attractive to tourists.
"Last year tourism generated $8.3 billion in visitor expenditure for the State's economy and more than 94,000 jobs. This injection of Federal funding will help increase visitor spending and create more tourism jobs in regional areas," he said.
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WA projects were selected through a grants process, with up to $500,000 awarded on a matched funding basis to the successful applicants. A spokeswoman for Dr Hames said a dollar amount for Mersey Point Jetty could not be provided due to "commercial in confidence".
The jetty has proved a point of contention in the past 12 months, with the City of Rockingham first proposing to allocate $2.645 million for the construction of a new jetty at Mersey Point in October, and then deferring a decision until councillors could attend workshops to clarify their options. The jetty, which caters for ferries departing for and returning from Penguin Island, was built in 1963, with upgrades in 1970, 1988 and 1999.