LAKE COUNTY >> Recent lab results from water samples taken from specific areas in Clear Lake show high levels of microsystins (toxins) in the cyanobacteria blooms occurring in recent weeks. Although these microsystins can be harmful to pets and wildlife, and if ingested in large doses have the potential for harm in humans, recreation on Clear Lake can still be safely enjoyed if proper precautions are taken.
Although cyanobacteria blooms are also known as blue-green algae, they can also appear as white, red, brown or black mattes or paint-like scum floating on the top of the water. Clear Lake is often susceptible to blooms due to its shallow depth, high nutrient levels and warm temperatures. Cyanobacteria frequently bloom on Clear Lake in the hot months of late summer and early fall.
Recent water samples were drawn from Clear Lake by the Environmental Protection Agencies of the Big Valley Rancheria and the Elem Indian Colony from areas at Austin Park, Clearlake Oaks, Soda Bay Cove, South Lakeport, Lucerne Park, Big Valley and Sulphur Bank Mine. The draws were overseen by Environmental Director Sarah Ryan of Big Valley Rancheria and Environmental Director Karola Kennedy of Elem Indian Colony.
The samples were analyzed at the California Animal Health and Food Safety (CAHFS) lab at UC Davis. Repeat testing is currently underway.
In response to these test results, the county is taking a series of actions.
“Public Health is monitoring technical information, working with local health care facilities and coordinating with other agencies as necessary to address health concerns that relate to potential impacts of cyanobacteria,” Lake County Public Health Officer Dr. Karen Tait said. “We are not alone in facing new challenges posed by cyanobacteria. This is a global phenomenon. We are working hard to identify and respond to related health concerns.”
Local utilities that are receiving water taste and odor complaints are in communication with state regulatory agencies and, as a safety precaution, water samples are being drawn at the raw intakes and at different treatment locations for analysis.
There is currently “Health Advisory” signage posted at public parks and beaches along Clear Lake. The county is urging residents and visitors to read those advisories and follow the safety guidelines set forth. Businesses that work directly with tourists are encouraged to educate those visitors about the safe use of the lake during cyanobacteria blooms.
In mid-May, the Lake County Department of Water Resources mailed out an informational cyanobacteria postcard entitled “Living with a Natural Lake” to owners of properties along the shoreline. The postcard was created in a partnership between the Lake County Water Resources, Environmental Health, Public Health and Administrative departments.
Do”s and don”ts to stay safe and healthy around cyanobacteria blooms are included in the postcard. It also provides information on how to distinguish cyanobacteria blooms from the harmless algae blooms that grow on Clear Lake. Those postcards were also distributed to lodging facilities and businesses to hand out to visitors and residents. Postcards are still available for distribution. Call 263-2580 to request copies.
Jill Ruzicka is the senior analyst for the Lake County Administrative Office.
