Police are conducting random spot-checks on the homes of Victorians who have been told to self isolate amid concerns from doctors that people are flouting quarantine orders and putting the community at risk.

Victoria Police confirmed to The Age that officers acting under the state of emergency declared by the Andrews government had been knocking on doors and checking on residents.

A man in personal protective equipment outside the international departures terminal at Melbourne Airport last week. Credit:AAP

Anyone who fails to follow a public health order will face a $20,000 fine, though no one has yet been charged as a result of quarantine inspections.

Police declined to say how many home visits officers had conducted in response to information provided by the Department of Health and Human Services and other authorised bodies.