A warning for blue-green algae has been issued for Lake Windamere near Mudgee.
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The red alert level indicates that people should not undertake recreational activities where they may be coming into direct contact with the water, such as swimming, as well as domestic uses including showering and washing.
The species of blue-green algae identified are potentially toxic and may cause gastroenteritis in humans if consumed, and skin and eye irritations after contact.
Contact with the water may also pose a threat to livestock and pets.
Mudgee’s town water supplies remain unaffected and safe to drink.
Residents are advised not to enter the lake’s water, drink untreated water or bathe in water drawn from the lake while the warning is in place.
Boiling the water does not remove algal toxins.
Livestock owners are reminded to continue to check stock water supplies for blue-green algae and to remove stock from foreshores where surface scum is visible or blue-green algae are suspected.
Any fish caught should be cleaned and washed thoroughly in uncontaminated water and any internal organs disposed of before consumption.
It is not possible to predict how long the algae will remain at high levels. Regular monitoring will continue and the alert will be lifted as soon as the high levels of algae dissipate.
Algae samples collected downstream of the Lake Windamere indicate that Cudgegong River has no algae alert.
People who believe they may have been affected by blue-green algae are advised to seek medical advice.
Blue-green algae 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.
Updates about blue-green algae blooms and red level warning areas can be obtained by calling 1800 999 457 or visiting www.waternsw.com.au/water-quality/algae.