COVID-19 has been found in the Capalaba wastewater treatment plant.
The plant handles waste from Alexandra Hills, Birkdale, Burbank, Capalaba, Chandler, Sheldon, and Wellington Point.
Fragments of SARS-CoV-2 have also been detected at Maroochydore and Maryborough plants.
Queensland Chief Health Officer Jeannette Young said anyone with symptoms, no matter how mild, should be tested.
"Symptoms include fever, cough, sore throat, runny nose, fatigue, diarrhoea, nausea or vomiting, and loss of taste or smell," Dr Young said.
"As we've seen over the past couple of weeks, we're still in this pandemic and we can't be complacent.
"It is critical we detect any cases that we may not be aware of as quickly as possible through our testing system."
Queensland did not record any new cases of COVID-19 yesterday although a 77-year-old male from PNG passed away from complications due to COVID-19.
He was a dual Papua New Guinea, UK national who was transported by Medivac from PNG to Redcliffe Hospital on March 28, as his condition was worsening.
Dr Young said PNG was one of Queensland's closest neighbours, and support would be given when needed.
"Since the beginning of the pandemic, aeromedical crews have transferred a number of COVID positive, and potentially COVID positive patients to Queensland," she said.
"As this case was diagnosed in PNG, it will be not be included in Queensland's statistics."
The Queensland COVID-19 death toll remains at six.
Restrictions like wearing masks in public are in place for Queensland, which will likely end on 15 April.
COVID-19 fragments have previously been found at Cleveland, Victoria Point and Luggage Point waste treatment plants.
The viral fragments show that there is potentially an undetected case in the community or that the detections relate to previous COVID-19 cases who can shed viral fragments for about two months after they are no longer infectious.
The Victoria Point plant handles waste from Redland Bay, Thornlands and Victoria Point.
For more information about Queensland's wastewater surveillance program, visit the Queensland Health website.
