The redraw of boundaries has been proposed after a population boom in the metropolitan area resulted in a discrepancy in electoral representation.
Public comment is being sought on the changes that, if accepted by Parliament, would come into effect for the 2017 State Election.
The last redistribution was in 2008 and established the seat of Cannington.
Riverton MLA Mike Nahan was elected in 2008 and retained the seat for the Liberal Party in 2013 following a significant swing. Political analyst Antony Green predicted the redraw would strengthen the Liberal Party�s margin on the seat to 12.6 per cent.
The electorate would gain the suburbs of Bull Creek, Brentwood and Mount Pleasant east of Kwinana Freeway, and lose Parkwood, Riverton east of Riley Road, and Canning Vale south of Roe Highway.
Dr Nahan said the redrawing of boundaries was no guarantee the seat would remain in Liberal Party hands.
�I�ve been involved in politics for long enough to know that if you don�t work hard to represent your local community, you won�t survive and I plan to continue working hard for the Riverton community,� he said.
Cannington MLA and Labor Party member Bill Johnston has held the seat since it was established and a redraw would increase the margin from 2.3 to 2.9 per cent, with gains including Riverton east of Riley Road, Parkwood, Bentley and Welshpool east of Leach Highway.
A loss of Wilson is not predicted to spell bad news for the seat, which recorded a 7 per cent swing to the Liberals at the last election.
Mr Johnston said he had enjoyed representing Wilson and would continue to do so if the changes were not accepted.
He said he would not speculate on whether Cannington was a safe Labor seat.
�This is an area of working people, both long-term residents and migrants who only get ahead by working hard, like my family did when I was a kid,� he said.
�I look forward to continuing to represent them.�