How do lakes clean themselves?

Turnover is a natural way the lake cleans up harmful bacteria and algae. It carries dead algae down into the depths of the lake where there is less sunlight, helping to prevent algae growth. You can think of it as an escalator, moving the algae cells from the top of the lake to the bottom.



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“For the most part, swimming in lakes and rivers is relatively safe,” Watts said. “However, there are always going to be some pathogens present in these natural bodies of water, and while most may be relatively harmless, there are some that can be negatively impactful.”

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Washing oneself with soap of any kind in a lake, pond, river, or ocean is terrible for the environment. Even if the bottle is labeled biodegradable, natural, or organic, it's still bad.

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Pools also tend to be much cleaner than natural lakes. This is because most pool owners take extra care to make sure the pool is sanitized, oxidized, and pH balanced on a regular basis. You're far less likely to pick up an infection from swimming in the local pool.

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Look for signs of poor water quality, such as algal blooms and dirty or turbid water. Do not swim in water that smells like rotten eggs or sewage. Avoid swimming near pipes that drain into lakes or streams.

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Look for signs of poor water quality, such as algal blooms and dirty or turbid water. Do not swim in water that smells like rotten eggs or sewage. Avoid swimming near pipes that drain into lakes or streams.

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