Update 9 February 2024
Toxic Algae levels in the Wai-Iti and Lee Rivers have dropped below 20% coverage. This reduced presence means a lower risk and we have removed all signage at the sites of concern.
Previous information January 2024
It's time to remind everyone to be aware of toxic algae in our rivers and the risk to dogs and potentially those playing in the river if they are not careful to avoid it.
Toxic algae coverage in the Wai-iti River has now exceeded 20 percent, and we have recently recorded around 16 percent coverage at the Meads Bridge section of the Lee River. Signage has been put up at several locations around the Lower Waimea and Wai-iti Rivers, as well as Pigeon Valley Road, to alert those travelling within the vicinity of the river.
Please be vigilant and familiarise yourself with what the toxic algae looks and feels like – particularly if you're a dog owner or a parent with toddlers.
This alga is natural and occurs during extended periods of low flow in rivers. It is black and forms gelatinous mats on the riverbed. It can also have a distinctive musty smell which is attractive to dogs. However, it is usually only a problem if the dog eats it.
If you do see any of this alga, it would be wise to put your dog on a lead, and we strongly advise preventing your dog from scavenging, or playing in or near the water if the alga is present.
If you, your dog or other animals are sick after being in or near the affected river, consult your doctor or vet immediately.
We are continuing to monitor other river areas across the District over summer and will update this page(external link) if algae are found elsewhere.