The council is, however, advising residents to protect themselves from mosquitoes.

NSW Health's mosquito surveillance program - from December to May each year, when mosquitoes are most active - involves weekly trapping and assessment for diseases.

"During recent months, council officers conduct weekly trapping at Dora Creek, Teralba and Belmont and the live trapped mosquitoes are sent to the Department of Medical Entomology at Westmead Hospital in Sydney for identification and assessment to determine whether they are active carriers of any disease," council's waste, environment and rangers manager, Keith Stevenson, said.

"The department reported an increased mosquito population throughout the east coast of Australia correlating with an increased virus presence including Barmah Forest virus detected in Belmont, Teralba and Dora Creek."

Barmah Forest virus is transmitted to people by the bite of a mosquito infected with the virus.

Symptoms include fever, rash and sore joints.

Residents should wear appropriate clothing, use repellent, fit screens on windows and doors, remove or empty still water and use known personal safeguards against mosquitoes when outdoors, particularly during the warmer months at dawn and dusk, Mr Stevenson said.

The council does not spray or otherwise actively control mosquitoes because, for better or worse, the insects are a natural part of a healthy environment, he said.