Everything you need to know about Blue-Green Algae

What is Blue-Green Algae?

Blue-Green Algae (BGA) blooms are most common in summer and early autumn, often referred to as the BGA season. BGA are naturally occurring organisms commonly found in still or slow-moving water, such as dams, lakes, ponds, and wetlands, unused swimming pools, and stagnant pools of water, particularly during warm weather and high nutrient conditions. Under favourable circumstances, such as abundant sunlight, warmth, and nutrients, BGA can multiply rapidly in still or slow-moving water, forming blooms that discolour water and create surface scums.

Some species produce cyanotoxins, which pose significant health risks: contact with BGA contaminated, untreated water can cause skin and eye irritation, ingestion may lead to gastroenteritis, and in severe cases, toxins can damage the liver or nervous system.

Importantly, boiling BGA contaminated water does not remove these toxins and can make them more concentrated. Pets and livestock that drink contaminated water can become seriously ill or die, and blooms also reduce oxygen levels in water, harming fish and other aquatic life.

What does a Red Alert notice on Dams or Lakes mean?
A Red Alert indicates high levels of Blue-Green Algae, posing serious health risks. Avoid swimming, fishing, and using untreated water until the alert is lifted.

What to do during a red alert for Blue-Green Algae?

A Red Alert means high levels of Blue-Green Algae are present, posing serious health risks. Follow these guidelines:

• Avoid all water-based recreation: Do not swim, fish, kayak, or engage in any activity that involves contact with the water.
• Keep pets and livestock away: Animals can become very ill if they drink or swim in affected water.
• Do not use untreated water: Never drink or cook with water from the dam or lake. Boiling does not make it safe and can release more toxins.
• Stay clear of algal scum: Contact can cause skin and eye irritation, stomach upsets, and in severe cases, liver damage.
• Fishing precautions: Do not eat mussels or crayfish from affected areas. If you catch fish, clean thoroughly in safe drinking water and discard internal organs.
• Seek medical advice if you suspect exposure or illness.

Armidale Regional Council (ARC), as the local water authority, is actively monitoring Blue-Green Algae alerts and water conditions. ARC will provide updates and advise when it is safe to resume recreational activities. For more information, you can always check water usage and algae status on the button below.

Is water safe when Blue-Green Algae reaches the Water Treatment Plant?

When raw water containing Blue-Green Algae (BGA) enters the Water Treatment Plant (WTP), it undergoes rigorous treatment processes that remove algae and associated toxins.  Armidale Regional Council follows the Australian Drinking Water Guidelines, ensuring treated water is safe for consumption and meets all health standards.

Even during Red Alerts at Malpas or Guyra Dams, the water supplied through the WTP is tested regularly and confirmed safe.

Is my tap water safe during BGA season?
Yes. Town water is treated at the water treatment plant to remove algae and toxins. Regular testing, such as microbiology, chemistry and toxin analyses ensures that the drinking water supply to the residents meet Australian Drinking Water Guidelines.

I’m connected to the raw water. Can I use untreated water during an algal alert?

Residents connected to raw water supplies should avoid using untreated water for drinking or domestic purposes during algal alerts.

For any concerns, contact Council on 1300 136 833