Beachgoers have been warned to avoid several beaches today due to dangerous swells and potential water contamination.

After heavy rains there is a “likelihood of bacterial contamination” at some beaches according to the Office of Environment and Heritage.

Bronte and Coogee beaches are reportedly the worst affected. And pollution is likely in Bondi; Little Bay and Clovelly; North Curl Curl; Freshwater; Shelly (Manly) Boat Harbour; North and South Cronulla; and Oak Park. Swimming sites in Sydney Harbour, including Woolwich Baths, Tambourine Bay and Rose Bay Beach also have pollution warnings. Beachwatch advises swimmers wait no less than three days after rainfall before diving into the harbour. About 17 beaches were closed throughout Tuesday due to dangerous surf conditions, too. Today, most patrolled beaches across Sydney remain closed including Palm Collaroy, Freshwater, Manly, Bondi, Clovelly and Coogee.

Stay up to date with beach closures here