Windamere Dam: Blue-green algae is potentially toxic

The alert has been issued based on visual observations and will be continually assessed according to WaterNSW.

The Red Alert level warning means people shouldn't undertake recreational or other activities where they might come into contact with the water directly such as swimming, as well as domestic uses including showering and washing. Skin and eye irritations can occur after contact with water.

WaterNSW says the species of blue-green algae identified are potentially toxic. 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. Algae may cause gastroenteritis and other health issues in humans if consumed.

Read more:

Boiling the water does not remove algal toxins. Town water supplies remain unaffected and safe to drink.

WaterNSW warns that people should not eat fish, mussels or crayfish from Red Alert warning areas. It is advised that stock and domestic users be on the lookout for algae scums and seek alternate supplies. 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.

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. 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.

If you believe you 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: waternsw.com.au/water-quality/algae

Sign up for our free newsletter and breaking news emails.