A Sydney council has been issued an official clean-up notice over orange sludge which leaked into a waterway in a major national park. Ku-ring-gai Council self-reported a leak from an old landfill in Turramurra to the NSW Environment Protection Authority (EPA) on July 11 which saw a watercourse flowing through Ku-ring-gai Chase National Park polluted with leachate. The leak was found to be from a faulty pump underneath North Turramurra Golf Course. READ MORE: Ozzy Osbourne dead at 76, just weeks after final concert READ MORE: Child victims of human trafficking sex ring found in bunker An EPA officer visited the scene and found an orange liquid and sediment from a system wich disposes water from a former landfill site within the golf course. Photos from the scene show the polluted water flowing through a waterway in the national park. A clean-up notice was issued to the council which required it to prevent, remove and divert the liquid from the national park. A replacement pump was later put in place by the Ku-ring-gai Council to stop the leak. READ MORE: Horror Bunnings 'prank' leaves 11 people in hospital "EPA officers collected samples of the leak and water samples from an unnamed creek downstream which will help inform if there was any impact to the environment," A NSW EPA spokesperson told 9news.com.au. "The EPA's investigation is continuing." 9news.com.au has contacted Ku-ring-gai Council for comment. DOWNLOAD THE 9NEWS APP: Stay across all the latest in breaking news, sport, politics and the weather via our news app and get notifications sent straight to your smartphone. Available on the Apple App Store and Google Play.