Residents are being warned not to swim, fish or come into contact with water at Melton Reservoir because of a blue-green algae bloom.
Southern Rural Water is monitoring the bloom, which can be dangerous to humans and animals, and will remove warning signs when the water is considered safe.
Blue-green algae can cause skin rashes or itchiness; sore eyes, ears and nose; or, if swallowed, gastroenteritis, nausea or vomiting. Boiling the affected water does not make it safe for use.
People who come into direct contact with contaminated water should wash immediately in fresh water or seek medical advice if symptoms persist.
Information: 1300 139 510
