Does rain add oxygen to a lake?

During rainy seasons, oxygen concentrations tend to rise in most surface waters because rain saturates with oxygen as it falls. More sunlight and warmer temperatures also increase plant growth and animal activity, which may increase or decrease DO concentrations and increase diurnal fluctuation.



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During this cycle, the dissolved oxygen from the top layer of the lake moves to the bottom of the lake until ice forms across the surface. After the lake freezes, the only new dissolved oxygen is produced by underwater plants, so it has to be used sparingly.

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We call it the 48-hour rule, and it goes like this: In order to protect your health against recreational water illnesses, avoid contact with the water for at least 48-hours after a significant rain event. Think that sounds harsh? Some places suggest waiting up to 72 hours.

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A significant rain event can upset the balance in your pond, adding more water, and often, this water is runoff from your lawn or farm, which may contain pesticides and/or herbicides. This can alter the oxygen levels in your pond and cause the rapid accumulation of floating green organic matter.

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Often, during hot summer months, the amount of dissolved oxygen in a lake becomes low, making fish inactive. Rain will aerate the surface water and often has a cooling effect, both of which can activate fish.

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