On Monday, between 8pm and midnight, EPA and council officers conducted a noise survey at Rydalmere Wharf and three residential streets in Rydalmere and Ermington, where they detected sounds matching the reported humming.

“We acknowledge that noise pollution can be both frustrating and disruptive and want to thank the community for their patience as we have worked to identify the noise’s source,” an EPA spokesperson said.

“We are continuing the investigation and will work with all three premises to further pinpoint the sources of the noise, with the aim of mitigating the issue and reducing noise impacts on the surrounding community.”

All three premises are regulated by the EPA, and the council will assist the investigation before further action is taken.

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City of Parramatta spokesperson said: “The health and wellbeing of our residents is our highest priority.”

The Sydney Morning Herald has opened a bureau in the heart of Parramatta. Email parramatta@smh.com.au with news tips.