 Water samples were taken from El Dorado Beach and Nevada Beach on July 8th and 10th, but showed no signs for toxins associated with harmful algal blooms. A pond not connected to the lake at Nevada Beach contained a low level of a toxin called saxotoxin, known to be a potent neurotoxin. It's found in shellfish contaminated by toxic algal blooms. The pond has been fenced off to prevent dogs and their owners from accessing it.