The Commonwealth was asked months ago by the West Australian government to provide more information about its national redress scheme for child sexual abuse victims and still hasn't replied, Premier Mark McGowan says.
Prime Minister Malcolm Turnbull announced on Friday NSW and Victoria had signed up to the scheme, which begins on July 1, but Queensland and WA want more details.
"We wrote to them, as I recall, back in November or December with seven points seeking information from them and we haven't had a response. We can't make decisions on these things unless we get all the information," Mr McGowan told reporters on Sunday.
He said the federal government needed to explain what responsibility it would take for the post-war Commonwealth Child Migration Scheme.