toxic algae

Toxic Algae Bloom at Mission Trails Dam Site

Source: San Diego River Park Foundation

August 28, 2025 (San Diego) – Water samples collected last week at Old Mission Dam in Mission Trails Regional Park have tested positive for a cyanotoxin that can be harmful to people and pets.

The San Diego River Foundation has posted caution signs, in cooperation with the California Water Boards San Diego Region and rangers from the park owned by the city of San Diego.

This was detected at the lowest tier of the three tiered levels, but visitors should:

* avoid touching algae/scum

* do not drink the water

* do not let pets enter or drink the water

* keep children away from algae in the water and shore

* do not eat shellfish from the water


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BLUE GREEN ALGAE INVADES EAST COUNTY LAKES

 

The naturally-occurring algae can form toxic blooms, causing severe illness in humans, kill pets, livestock, and other animals

By Paul Kruze, Contributing Editor

September 3, 2018 (San Diego )-- Some people believe in the health benefits of blue green algae as nutritional supplements found at health food stores.  But too much of it can make humans very sick and even kill pets and larger animals exposed to blue-green algae scum that forms on lakes and reservoirs.

While the County of San Diego has been battling a full-scale war on blue-green algae at Lindo Lake County Park in Santee, East County Magazine has received inquiries from readers who spotted algae scum at Lake Morena and voiced concerns.


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Support community news in the public interest! As nonprofit news, we rely on donations from the public to fund our reporting -- not special interests. Please donate to sustain East County Magazine's local reporting and/or wildfire alerts at https://www.eastcountymedia.org/donate to help us keep people safe and informed across our region.

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