An estimated 3500 homes north of Brisbane are being warned to boil drinking water before consumption, with concerns held that water quality could be compromised.

Seqwater and Unitywater said on Monday evening that for the next 24 hours maintenance would be carried out at the water treatment plant and associated infrastructure, which supplies residents in Petrie and Old Petrie Town.

Residents in Petrie and Old Petrie Town are being warned to boil drinking water for the next 24 hours due to health concerns. Credit:iStock

Unitywater executive manager infrastructure services Rob Dowling said the first batch of test results were due to come through at 2pm on Tuesday.

But he told ABC Radio Brisbane multiple tests would be needed to confirm the water was safe to drink again.