Local residents joined staff at Milson Island Sport and Recreation Centre on Wednesday to clean up Mooney Mooney's Deerubbin Reserve.
The reserve is a popular boat launching site with locals and visitors but become a dumping ground over recent years and was in a heavily polluted state when the camp's staff invited Hornsby State Liberal MP Matt Kean to join them for a mass clean-up effort.
"It's applauding to see so much litter and dumping going on at this normally beautiful spot next to the Hawkesbury River," Mr Kean said.
"I want to thank the staff at Milson Island Sport and Recreation for taking the initiative by rolling up their sleeves and organising a clean-up day to remove the bags of rubbish which we collected."
Staff at the camp are hoping to make the clean up an annual event and are calling on interested members of the community to volunteer their time to help rehabilitate the surrounding local bushland.
Anybody who spots illegal dumping is encouraged to contact local councils, the Environment Line on 131 555 or NSW Police or Crime Stoppers on 1800 333 000.