Red level alert for blue green algae at Seaham WeirDate: 2017 01 13
The Hunter Regional Algal Coordinating Committee (HRACC) has issued a red level warning (high alert) for blue-green algae in the Williams River at Seaham Weir, and lifted the previous red level warning in the river at Clarencetown.
A red alert level warning 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.
Contact with the water may also pose a threat to livestock and pets.
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. Boiling the water does not remove algal toxins. People are advised not to enter the water, not to drink untreated water or bathe in water drawn from the dam while this red alert level warning is in place.
Town water supplies remain unaffected and safe to drink.
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.
Water sampling upstream in the Williams River have shown cyanobacteria well below the red level threshold, and so the committee has lifted the previous alert for blue green algae at Clarencetown.
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.
People should not eat mussels or crayfish from red level warning areas. Any fish caught should be cleaned and washed thoroughly in uncontaminated water and any internal organs disposed of before consumption.
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. 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.
Information updates about blue-green algae blooms and red level warning areas can be obtained from the Regional Algal Coordinating Committee freecall Algal Information Hotline on 1800 999 457 or visit Algal information.
Media contact: 02 6391 3686