The North Coast Regional Algal Co-ordinating Committee has issued a high alert for blue-green algae in the stormwater pond at Baywood Chase residential estate in Suffolk Park.
The alert indicates that waters are unsuitable for recreational use or primary contact by water users and may also pose a threat to pets.
Warning signs have been positioned around the lake and will remain in place until the bloom subsides.
Blue-green algae can cause skin rashes, asthma and eye and ear irritations if contacted and diarrhoea and other health problems if ingested.
Animals can become very sick as a result of drinking water affected by blue-green algae and there have been cases of animal deaths. Follow this link for more information.