A spokesman for the council has declined to identify the individual, or provide details including age or gender.

A statement about the death was sent to media advising that the worker died while "undertaking normal duties" and the death was believed to be due to natural causes.

But the spokesman said the death was referred to the New South Wales coroner for investigation, and all council staff were being offered support.

Council interim general manager Peter Tegart extended his deepest sympathies to the friends, family and workmates of the staff member.