Aaron Provincial Park - North Beach

At Aaron park east beach you can enjoy the clear, shallow water of ancient Thunder Lake. Tens of thousands of years ago, slow-moving glaciers melted to leave behind a massive lake called Agassiz. Over time, Lake Agassiz shrank and created hundreds of smaller lakes like Thunder Lake. Here you'll find a beautiful sandy beach equipped with nearby parking, restrooms, and picnic area for your friends and family.

WATER QUALITY

Passed water quality tests at least 95% of the time
Historical Status
This status is based on the latest sample, taken on August 14th, 2018. Lake Ontario Waterkeeper updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on at

For water quality icon legend, click:

CURRENT WEATHER

-11°C

Clear and sunny

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MONITORING FREQUENCY

SOURCE INFORMATION

Ontario Parks beaches are monitored according to the province's Beach Management Protocol. The Protocol says that authorities must check water quality at least weekly from June 1 to Labour Day at beaches where there are formal swimming programs or lifeguards. Some beaches can only be tested monthly, due to factors such as location. Samples are processed at provincial labs and therefore processing times vary from park to park, depending on location.

Beach postings may occur anytime during the bathing season. As part of the routine
monitoring program of public beaches, beach postings may be required where
exceedance of recreational water quality levels and other environmental data supports the need for posting. Beaches are posted when the geometric mean of the samples collected exceeds 100 E. coli / 100 ml of water.

If the recreational water quality at a swim site meets this standard it is given a GREEN current status in Swim Guide.

If the recreational water quality at a swim site exceeds this standard it is given a RED current status in Swim Guide.

When water quality exceeds the recreational water quality standards, Ontario Parks posts alerts on their website. Beaches are also physically posted with a sign. Ontario Parks re-samples water that has exceeded the standard as soon as possible.

Lake Ontario Waterkeeper enters water quality test results into Swim Guide according to the actual date the sample was taken. Each Ontario Park typically samples its beaches on the same day every week (or month). Ontario Parks has provided us with the sample collection schedule (Mon-Sun) for Ontario Parks' beaches they monitor. We enter water quality data for Ontario Parks according to their sample collection schedule.

WATER QUALITY GRAPH