Water NSW has issued a recreational red alert warning for blue-green algae for the Williams River at Seaham Weir and Clarence Town.
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The high level warning warning means people should not swim or undertake recreational activities where they may come into direct contact with the water.
Hunter Water Corporation is managing the Seaham Weir alert and Dungog Shire Council is managing the Clarence Town alert.
This alert does not affect Hunter Water’s drinking water supplies, which remain safe to drink.
Warning signs have been erected at key recreational areas that will remain in place while high levels of blue-green algae are present.
People are advised not to enter the water, swim or bathe in water, or drink untreated water drawn from the river while this red alert level warning is in place.
Contact with the water may also pose a threat to livestock and pets.
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.
People should 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.
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.
The species of blue-green algae identified is 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.
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.
Water NSW said 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.
Updates about blue-green algae blooms and red level warning areas can be obtained by calling 1800 999 457 or visiting – http://www.waternsw.com.au/water-quality/algae
