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Sydney's beaches closed due to mysterious tar balls, linked to the city's sewage system.
Mysterious tar balls that closed Sydney beaches in late 2024 and early 2025 likely came from the city's sewage network, according to the NSW Environment Protection Authority.
The black and grey balls, mostly marbles-sized, matched samples from Sydney Water's wastewater treatment plants.
Sydney Water is now required to locate the source and prevent future occurrences.
The balls are considered a low health risk, but the EPA advises avoiding contact and reporting new finds to local councils.
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Las playas de Sydney se cerraron debido a las misteriosas bolas de alquitrán, conectadas al sistema de alcantarillado de la ciudad.