Sutherland Shire Council is appealing for anyone with information about pollution found in Ewey Creek at Gymea to report it to them.
Council crews were doing stabilisation work at the creek on Tuesday, July 15, when they found a ''suspicious substance'' floating on the surface.
Sutherland Shire mayor Stephen Simpson said council officers took samples which were being analysed.
''That will hopefully give us a better idea of where it may have come from,” Cr Simpson said.
“There are hefty fines applicable to anyone caught discharging materials other than stormwater into the stormwater system.''
Under the Protection of the Environment Operations Act, maximum penalties of up to $1 million for a corporation and up to $250,000 for an individual can be applied for polluting waters.
If you have information about the pollution in Ewey Creek in Gymea, you may report it to the council via the Report It app, the council's website www.sutherlandshire.nsw.gov.au or phone 9710 0333.
