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You May Not Want To Swim In These 8 Northern California Lakes This Summer Due To A Dangerous Discovery

Several bodies of water in Northern California have been placed under health advisory in recent years due to high and potentially dangerous levels of bacteria and toxic algae. Sadly, 2 dogs have already died this year in a pond in Napa County because of exposure to toxic algae. Officials from the California State Water Resources Control Board are saying that the problem is worse than ever this year.

Algae blooms are large formations of algae that can cover the surface of a body of water. Algae blooms are common in flat water, but they don’t always turn toxic. There have been a few cases of toxic algae this year but they only a few that have turned toxic.

Below you will find a list of places that have been put on the watch list because they have had the toxic blue-green algae in recent years. Cyanobacteria, also known as blue-green algae, usually peaks in late-July to early August, so keep your eyes peeled for this dangerous aquatic species.

For more information about what lakes have been put on the watch list and the dangers posed by toxic algae, click here.

Interested in learning more? Watch this video so you know what to look for:

Algae levels and advisories fluctuate throughout the summer, so the information above is subject to change as new water samples are taken. Please follow all signs and directions at local lakes and rivers, and stay up to date on water advisories in your area here.

Jill S.
Jill is a freelance writer from a small Northern California town and lives in the Sierra Nevada mountains. If you have an idea for an Only In Northern California story, email her at jsanford@onlyinyourstate.com.