The Ministry of Environment and Grand River Conservation Authority is warning swimmers to stay away from algae blooms on Conestogo Lake.
Last week the GRCA reported toxic blue-green algae could be present in the lake and advised anyone on it not to use the water, eat the fish out of it or swim in it.
The MOE says new samples have confirmed low levels of the toxins found in the algae.
Even though levels are well below recreation guidelines, the ministry is still advising swimmers or boaters to steer clears of any algae blooms and use the area at their own risk.
The GRCA says it will continue to monitor the lake.