A beachgoer in Sydney’s south was left baffled after spotting a neon green liquid seeping out of a pipe into the ocean.

A local spotted the neon-green liquid leaving a pipe from the stormwater system and travelling into the sea at Cronulla Beach this afternoon.

While the neon-green liquid looks like something out of a science-fiction film, the Environmental Protection Authority said there was no reason to panic.

A local spotted the neon-green liquid leaving a pipe from the stormwater system at Cronulla Beach and travelling into the sea this afternoon. (Supplied)

“Based on the images provided we believe the discolouration is likely to be fluorescein dye, which is commonly used in plumbing/drain testing and dissipates quickly once diluted,” a spokesperson for the EPA said.

“Fluorescein has low toxicity but even small amounts can be highly visual and for this reason its use should always be minimised.

“The EPA has officers on-site in an effort to identify a source of the material.”

The Sutherland Shire Council said they visited the site and also believed the green substance was a dye used by plumbers to test drainage lines and detect faults.

“Sutherland Shire Council is aware of a coloured substance that has exited the stormwater system at North Cronulla,” a spokesperson for the council said.

“Council is currently investigating the matter to identify the source of the substance.”

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