Early results showed West Australian Labor picking up double-digit swings in many key seats in Saturday's state election, and seats such as Forrestfield in suburban Perth changing from the Liberal Party to Labor.
ABC election analyst Antony Green said the swings were big enough for Labor to win government.
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Nine-Galaxy poll predicts Labor victory
Nine-Galaxy exit poll says Mark McGowan looks set to achieve a swing of 12%, which would see him win 17 new seats and form government. Vision: Nine News Perth.
The Liberal Party was bracing itself for a crushing loss, with an exit poll showing Labor on track to record a massive swing and One Nation's support collapsing.
A Galaxy-Nine Network exit poll of 1765 voters suggested the controversial preference deal between the Liberal Party and One Nation had backfired, with Pauline Hanson's party receiving just six per cent of the vote.
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The poll showed West Australian Labor leader Mark McGowan on track to pick up 17 seats – well above the 10 required to win power. Polling also showed Labor receiving 54.5 per cent of the two-party preferred vote compared with 45.5 per cent for the Liberals, a swing of 11.8 per cent to Labor from the 2013 election.
West Australian voters have tired of Premier Colin Barnett after eight years in power, and the rising unemployment rate damaged his chances.
The poll showed One Nation preferences breaking roughly 50-50 for Labor and the Liberals despite the preference deal.
One Nation was polling at 13 per cent early in the campaign, but has been hit by candidate scandals and damaging comments by Ms Hanson about vaccinations and Russian President Vladimir Putin.
Ms Hanson, who spent the week campaigning in the state, has said she hopes her party wins three upper house seats.
The exit poll was taken before polls closed on Saturday night, but exit polls by Galaxy at last year's federal election and the 2015 Queensland election were accurate.
Retiring West Australian Liberal MP Kim Hames said his party had made a mistake by doing a preference deal with One Nation.
"I wasn't terribly happy with siding with One Nation," Mr Hames said. "It's a big lesson for everybody.
"A lot of people who voted for us in the past didn't like the alliance [with One Nation].
"Quite a few of my friends said they wouldn't vote for us because of the deal."
Former West Australian senator Ian Campbell said the deal had been a "massive distraction and clearly not worth the effort".
Federal Labor MP Tim Hammond said: "The deal turned off a lot of soft Liberal or swinging voters in the Perth metropolitan area. They found the idea of a relationship with Pauline Hanson pretty repugnant."
Former Labor leader Kim Beazley said a single-figure result for One Nation would be a "disaster" for the party.
The poll showed voters were most concerned about state issues such as debt and privatisation with federal factors well down on their list of concerns.
Federal Opposition Leader Bill Shorten, who campaigned with Mr McGowan in Perth on Saturday, said Prime Minister Malcolm Turnbull had been "weak" in not opposing the preference deal.
"The Liberal deal with One Nation has been the exploding cigar of this election campaign," he said.
"Tonight Mr Turnbull will be watching the results come in from Western Australia with a very nervous eye."