More than 10 tonnes of asbestos-laden building waste has been dumped around Sydney's west, including one site in front of a childcare centre.
Four Parramatta streets have been turned into dump sites with piles of building waste suspected to contain asbestos left there by unknown people overnight.
A fifth dump site of approximately six cubic metres in waste - the equivalent of a skip bin - was discovered in Bachell Avenue in Lidcombe early on Thursday morning.
Cumberland Council has advised they expect the Lidcombe site will be cleaned up by the end of Friday.
One of the Parramatta dump sites is outside a childcare centre in Isabella Street.
Council contractors have secured all the waste and are removing it, according to Parramatta Council.
An investigation is underway.
If a business is found responsible, it could face fines of up to $5 million while an individual faces a fine of as much as $1 million and/or prison.