Port Macquarie-Hastings Council is warning visitors and residents to avoid recreational activities at Saltwater Creek outlet to Rainbow Beach, Bonny Hills after a red alert for blue-green algae was issued.
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Sampling by Port Macquarie-Hastings Council has shown very high numbers of a range of blue-green algae species, including one with the potential to produce toxins.
A council spokesperson said warning signs are permanently erected in the area. He said the alert does not affect local drinking water supplies, which remain safe to drink.
Under the alert, people are advised not undertake recreational activities where they may come into direct contact with the water, such as swimming or watersports. Contact with the water may also pose a threat to pets.
"People are advised not to enter the water, swim or bathe in water, or drink untreated water while this red alert level warning is in place," the spokesperson said.
People should also not eat mussels or crayfish from red alert warning areas. Any fish caught should be cleaned and washed thoroughly in uncontaminated water and any internal organs disposed of before consumption.
According to Water NSW blue-green algae species usually appear as green paint-like scums on the water, near the edges, or as greenish clumps throughout the water. It makes the water appear dirty, green or discoloured and generally has a strong musty or earthy odour.
The council spokesperson said one of the species of blue-green algae is potentially toxic and may cause gastroenteritis in humans if consumed, and skin and eye irritations after contact.
Blue-green algae occur naturally and can reproduce quickly in favourable conditions where there is still or slow-flowing water, abundant sunlight and sufficient levels of nutrients.
Regular monitoring by Port Macquarie-Hastings Council will continue, and the alert will be lifted as soon as the high levels of algae dissipate.
It is not possible to predict how long the algae will remain at high levels.
People who believe they may have been affected by blue-green algae are advised to seek medical advice.
Updates about blue-green algae blooms and red level warning areas can be obtained by visiting http://www.waternsw.com.au/water-quality/algae or by calling 1800 999 457.
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