Parks Victoria District Manager Western Basalt Jodi Heath said despite increased rainfall in the region, Parks the bloom is still lingering in the area.

"This bloom started in December 2020. Algal blooms are naturally occurring," she said.

"Blooms can be triggered by varying nutrient levels, low inflows, lower storage volumes, temperature and weather conditions.

"We test the water at Lake Bolac regularly and the most recent results are encouraging - levels of algae have fallen below dangerous levels.

"If the readings from the next samples - to be taken in August weeks - are also below that level, we can remove the algae warning.

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"Rain and recent flows are making a difference and we will keep the community informed about the situation."

The initial water quality warning for blue green algae bloom at Lake Bolac was issued on August 2, with the next update expected on August 25.

Parks Victoria said they undertake regular monitoring at Lake Bolac, have signage installed and undertake communications with local stakeholders, the Parks Victoria website and the Vic Emergency app.

Blue green algae is a common occurrence in Victoria and a natural component of most aquatic systems, and users should not be in direct contact with affected water in Lake Bolac.

As part of the initial water quality warning, it is expected the algae bloom will remain until there is significant rainfall to flush the lake or cooler conditions slow the algae.

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Regular testing is being conducted to identify new outbreaks or changes that might indicate improved water quality. This notification will be reviewed weekly and updated as the situation changes.

It is advised there is no swimming in affected areas or to use water for cooking, drinking, washing or showering. Boiling the water will not make it safe.

Pet owners should prevent pets from drinking or having direct contact with contaminated water.

Irrigation water contaminated with blue green algae should not be spray irrigated on vegetables and fruit, or come in contact with plants being grown for food during processing and packing.

Fruit and vegetables grown in the affected areas are safe to consume if farmers follow recommendations regarding blue green algae.

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