An extreme alert has been issued for blue-green algae in Lake Tuggeranong.
The ACT government said the lake was closed to swimming or any "primary contact" such as diving or waterskiing.
Fishing, boating and canoeing are still allowed, however, anyone should avoid water contact as much as possible and shower after water contact.
"In particular, contact with algal scum should be avoided," a statement read.
"Clothing that has been in the water should also be washed to remove any blue-green algae residue.
"Symptoms of blue-green algae exposure may include skin, mucosa and eye irritation, flu-like symptoms, hay fever-like symptoms and gastrointestinal illness.
"Anyone concerned about possible symptoms of blue-green algae exposure following water exposure should contact their GP."
Pet owners should not let their animals swim or drink the water as it can also make them very ill and possibly cause death.
Algae levels can change quickly. Water users should look for algae warnings signs which indicate the current algae alert level.
Parts of Lake Burley Griffin have also been closed for swimming due to blue-green algae levels.
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