Spring and summer are the peak times for families and water enthusiasts with canoes and kayaks to swim, paddle and enjoy the facilities at Lake Ainsworth in Lennox Head.

Ahead of another warm weekend, WaterNSW has issued a Red Alert warning for high levels of potentially toxic blue-green algae for Lake Ainsworth, after sampling conducted by Ballina Shire Council. 

The Red Alert warning applies only to untreated water at the identified location and will remain in place until monitoring confirms that the risk is sufficiently diminished.

People should avoid recreational activities such as swimming, water skiing, canoeing and any other activity that brings them into contact with this water body until the red alert warning is lifted.

Potentially toxic blue-green algae may cause gastroenteritis if consumed, while contact can cause skin and eye irritations. Consumption of water containing algal toxins may cause liver damage and other health problems.

People who suspect they have been affected by blue-green algae should seek medical advice.

People should not eat mussels or crayfish from red alert warning areas. A precautionary approach to eating fin fish from red alert warning areas is advised. Any fish caught should be cleaned and washed thoroughly in uncontaminated water; the internal organs should not be eaten. Avoiding fishing during a bloom is the best way to minimise risk.

Blue-green algae are naturally occurring and can reproduce quickly in still or slow-flowing water when there is abundant sunlight and sufficient nutrients.

Visit the Ballina Shire Council or local water utility websites for information about the management of blue-green algae risks in the nearby treated drinking water supplies.

Updates and information about blue-green algae blooms and red level warning areas can be obtained by visiting www.waternsw.com.au/algae.