Sydney residents were shocked to see the sea suddenly turn blood red in one of the city’s famous harbours. Local people, especially passing by Milson Park in Kirribilli, one of Australia’s rich suburbs, noticed this extraordinary color of the sea while walking on the beach. The red water current stunned locals and experts alike, as if the sea was stained with blood.
An Investigation has been Launched into the Cause of the Incident
In the face of the situation, both local government and regional officials were immediately sent to the scene. North Sydney Municipality and New South Wales Environmental Protection Agency officials began investigations to identify the source of the incident.
Red Color whose Source Cannot Be Found
As a result of the investigations, the source of the water turning red has not yet been determined. Authorities suggest that this color change may be caused by a possible plumber’s paint. The municipality spokesperson said in a statement: “We noticed the red water flowing from Milson Park into the harbor and investigations were initiated, but no definitive finding was found regarding the source,” he said.
Additionally, the NSW Environmental Protection Agency made a statement on the subject, saying: “North Sydney Council has notified us that red plumber’s paint has been found in a drain in Kirribilli and we are currently investigating the potential source.” he said.

What is Plumber’s Paint?
Officials stated that the red color may be caused by fluorescent dye (also known as drain tracing dye). These types of dyes are used by plumbers to monitor water flow or detect leaks in pipes. However, it was also noted that fluorescent substances are not toxic and can only produce dramatic color changes.
Similar Incidents Have Been Seen Before
It is not the first time that the sea in Sydney turns red. In 2012, a similar incident occurred off the coast of Sydney and sea water pollution occurred due to algal blooms. “red tide” It was defined as . This incident was also popularly known as the “fire at sea”.
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