Parents at a Perth hills primary school claim their children have been playing with and crushing up asbestos fragments found around the school, which is located next to an old landfill site.

Sonya Bell told 9 News Perth she would not be allowing her children to return to Gooseberry Hill Primary School until she was reassured by the Department of Education that all asbestos fibres had been removed.

"It's difficult to hear as a parent that your children have been playing with asbestos dust at school," she said.

"I don't want to get into hysteria, I want to make sure I have all the facts and I don't feel I have them."