An outbreak of algae at the Macintyre River at Lake Inverell has prompted WaterNSW to issue a red level (high alert) warning for blue-green algae.
Subscribe now for unlimited access.
$0/
(min cost $0)
or signup to continue reading
The red level warning means that people should not undertake recreational activities where they may come into direct contact with the water, such as swimming as well as domestic uses included showering and washing. Contact with the water may also pose a threat to livestock and pets.
Livestock owners are reminded to continue to check stock water supplies and remove stock from foreshores where surface scum is visible. Blue-green algae usually appear as green paint-like scum on the water, near the edges or as greenish clumps throughout the water.
It makes the water appear dirty, green or discoloured and explains the musty, earthy odour noted in some areas near the Macintyre River of late.
“It is important for people to err on the side of caution when dealing with water in the area,” says Tony Webber from Water NSW. “Fishermen should make sure they wash the fish in clean uncontaminated water, including the innards.”
People should not eat mussels or crayfish from contaminated areas.
The species of blue-green algae identified are potentially toxic and may cause gastroenteritis in humans if consumed and skin and eye irritation after contact. Boiling the water does not remove algal toxins. Town water supplies remain unaffected and safe to drink. However, people are advised not to bathe in water drawn from the dam while the red alert is in place and are also advised not to drink untreated water.
“The appearance of algae is a naturally occuring phenomenon driven by dry and hot weather conditions,” Webber said, and it appears when there is slow-flowing water, abundant sunlight and sufficient levels of nutrients. “There are half a dozen alerts at the moment across regional NSW and it is not unusual for an area to drop and then return to red.”
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. People who believe they may have been affected by blue-green algae are advised to seek medical advice.
For more information about blue-green algae and red level warning areas, call the Algal Information Hotline on 1800 999 457 or visit – www.water.nsw.gov.au