Officials from the California Water Resources Control Board are urging people to avoid Lake Elsinore due to an algae bloom that’s created dangerous levels of harmful toxins.

Visitors are urged to stay out of the water, keep their pets at a safe distance and do not drink water or eat any fish or shellfish from the lake.

Five “distinct areas” of Lake Elsinore were tested and high levels of toxins were detected that officials say pose a significant health risk.

“DANGER” signs have been placed at the lake to warn visitors about the elevated risks.

Officials say the City of Lake Elsinore has been testing the lake regularly because it is particularly vulnerable to harmful algal blooms due to its shallow waters, warm temperatures and previous history of outbreaks.

“Most recent sampling results indicate that the lake contains extremely elevated levels of toxins associated with cyanobacteria, a group of organisms that form harmful algal blooms and can produce potent toxins,” a release from the California Water Resources Control Board states.

A “danger” advisory goes into effect when officials detect at least 20 micrograms per liter of microcystin toxins; the latest results from testing in Lake Elsinore show the presence of as much as 36,750 micrograms per liter.

Toxic algal blooms can cause itchy skin and rashes, gastrointestinal distress, headaches, weakness and even abnormal breathing. Dogs and children are particularly at risk due to their smaller body size. If you, a loved one or pet have been exposed to harmful algae and begin experiencing symptoms, you should contact a health care provider immediately.

Officials say the algal bloom could change rapidly due to wind and waves which move the bloom into different parts of the lake. Heat and rainfall can also contribute to changing conditions.

For more on the current conditions at Lake Elsinore, click here.