"At this stage it is not known if there is any link with the death of the worker and their workplace," it said. "The investigation remains ongoing."

The sewage overflow was between the popular Brickpit walkway and the Eastern Water Quality Pond at Wentworth Common. The area is a favourite with families and includes play grounds.

As of Thursday, Sydney Olympic Park's website stated the ring walk, which circles the brick pit, had been closed for maintenance until further notice.

The area is also home to several stadiums, including ANZ, and other facilities that draw thousands of people each week.

On May 8, the Sydney Olympic Park Authority was advised of the death, prompting inquiries by several agencies, including Fire and Rescue NSW's Hazardous Materials Response Unit, and the police.

The site of the sewage overflow was determined to be safe, a government source said.

The Brickpit was the home of a state-owned brick manufacturing facility until it was shut down in 1988.

A ring walkway was built around the old brick pit pond for the Sydney Olympics, allowing visitors to view it without damaging the habitat of the endangered Green and Golden Bell Frog.

Wentworth Common is a large grassy park with barbecues, an adventure playground and a sandpit. It also accommodates a Water Recycling and Management System.

"The NSW Environment Protection Authority received a report of a suspected sewerage incident at Sydney Olympic Park in May and referred the incident to Sydney Water," the EPA said in statement.

Comment has been sought from Sydney Water and Veolia.

Veolia employs about 4000 people and operates 123 waste and wastewater treatment plants across Australia and New Zealand.

Do you know more? carrie.fellner@smh.com.au