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Washtenaw County Health Department, in consultation with the Michigan Department of Health and Human Services (MDHHS), is issuing a public health advisory for a suspected harmful algal bloom in Ford Lake in Ypsilanti, Michigan. People and pets should avoid direct body contact with scums in the lake, water that is blue-green, or water that looks like it has a green sheen or spilled paint on its surface. People and pets should also avoid swallowing the lake water.
There are different types of naturally occurring algal blooms that may be seen on lakes and rivers. Most are not harmful. However, there are some that are made of cyanobacteria that have the ability to produce toxins, causing a harmful algal bloom (HAB). At Ford Lake, a resident recently notified MDHHS of a suspected HAB when they saw an area of water that had a “spilled paint” look on the surface. Additionally, recent testing confirmed microcystin toxin in the water, indicating the possibility of a HAB, but on a follow-up site visit, inspectors did not observe one. This advisory is issued to alert the public to the possibility of a HAB. Residents should avoid direct body contact with scums in the lake, water that is blue-green, or water that looks like it has a green sheen or spilled paint on its surface.
People can water ski, boat, and tube but it is advised that caution be taken in doing so in areas with visible algal scums. Breathing in water droplets with algae from the boat spray may cause nose and throat irritation. Swallowing large amounts of water containing cyanotoxins while swimming, wading, or playing in the water may cause flu-like symptoms, gastrointestinal illness, or neurotoxic symptoms. These may include abdominal pain, vomiting, diarrhea, weakness, numbness, headaches, dizziness, or difficulty breathing. Swallowing large amounts of cyanotoxins can harm the liver or kidneys.
The United States Geological Services (USGS) is conducting monitoring of lakes in partnership with Michigan Department of Environment, Great Lakes and Energy (EGLE). USGS took two water samples from Ford Lake in mid-July.
A follow up site visit by the USGS on Thursday July 30 did not confirm an active visible bloom at the Lake Shore Apartment docks.
Over the last week, there have been reports of suspected HABs at Ford Lake. On Wednesday August 5, a resident reported a suspicious bloom to MDHHS. The bloom, observed on August 3, was located near the northern portion of the lake near Cliffs Drive and looks like spilled green paint on the water surface.
Washtenaw County Health Department wants residents to be aware that the potential for HABs exists on the lake. Water quality may change quickly and the presence of previous microcystins in the water and visible blooms in other locations mean that residents should avoid direct body contact with scums in the lake, water that is blue-green, or water that looks like it has a green sheen or spilled paint on its surface. Residents should remain cautious about contacting algae or potential HABs until at least two additional samples of the lake test clear of algal toxins.
Although most blooms are green algae and not harmful, there are some that are a type of cyanobacteria that have the ability to produce toxins – and can result in a harmful algal blooms (HAB). These toxins may affect the liver, nervous system and/or skin.
Factors that can contribute to HABs include: sunlight; low-water or low-flow conditions; calm water; warmer temperatures; and excess nutrients (phosphorus or nitrogen). The primary sources of nutrient pollution are runoff of fertilizers, animal manure, sewage treatment plant discharges, storm water runoff, car and power plant emissions, and failing septic tanks.
The Michigan Departments of Environment, Great Lakes, and Energy (EGLE) and Health and Human Services (DHHS) sample for HABs on a limited basis and work with local health departments to protect the public when toxins are discovered; however, some areas affected by HABs may go undetected. Suspicious-looking algae can be reported to EGLE by calling the Environmental Assistance Center at 1-800-662-9278 or sending an e-mail to [email protected]. See more at michigan.gov/habs.