Blue Green Algae occur naturally in our waterways. Blooms occur when conditions are favourable with high temperatures, high nutrients, and low flow. Blooms appear as a thick paint like accumulation on the water's surface or as small green floating dots.  Blooms are normally green or blue green in colour and have a distinctive earthy smell.

Blue Green Algae when in bloom can be harmful to humans and domestic animals. Blue Green Algae can contain neurotoxins, liver toxins and skin irritants. If people believe they or their animals have been affected by blue green algae they should seek medical attention.