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Addressing Concerns About Blue-Green Algae



The Indiana Department of Environmental Management (IDEM), the Indiana Department of Natural Resources (DNR), the Indiana State Department of Health (ISDH), and the Board of Animal Health (BOAH) are working to provide information about blue-green algae, also known as cyanobacteria, in our lakes.

Algae are commonly found in Indiana lakes and streams without concern, however the concentrated presence of blue-green algae can be linked to some adverse health effects. Factors promoting algal growth include sunlight, warm weather, low turbulence, and nutrient sources, such as phosphorus and nitrogen. Phosphorous is particularly important in fueling cyanobacteria growth. Often nutrient inputs come from nonpoint source pollution, but fortunately, there are many ways to reduce or stop nonpoint source pollution, many of which are simple things we can do right in our own backyards.

This website will be updated weekly during the sampling season to provide information about blue-green algae levels at the DNR lakes that IDEM samples and the Citizen Energy reservoirs in central Indiana. You can also check the status of the DNR lakes that IDEM samples at the DNR website for the specific property. This update may also include results for other lakes sampled by other entities wishing to post on this site. You will find links to IDEM’s sampling results and laboratory tests as well as links to other websites such as the World Health Organization, the USGS Kansas Water Science Center, and assorted information available through other states.

Indiana Reservoir and Lake Update

April 8, 2014

IDEM will begin blue-green algae sampling the week of May 12th and will end the week of August 29th. The following swimming beaches will be sampled:

  • Mississinewa Lake - Miami State Recreation Area
  • Salamonie Lake - Lost Bridge West State Recreation Area
  • Potato Creek State Park - Worster Lake
  • Pokagon State Park - Lake James
  • Chain O’Lakes State Park - Sand Lake
  • Monroe Lake - Paynetown State Recreation Area
  • Monroe Lake - Fairfax State Recreation Area
  • Starve-Hollow State Recreation Area
  • Deam Lake State Recreation Area
  • Hardy Lake State Recreation Area
  • Cecil M. Harden Lake (Raccoon Lake) - Raccoon State Recreation Area
  • Whitewater Lake at Whitewater Memorial State Park
  • Brookville Lake - Mounds State Recreation Area
  • Brookville Lake - Quakertown State Recreation Area

ISDH cautions Hoosiers of possible high levels of blue-green algae at many of Indiana's reservoirs and lakes. Swimmers and boaters should be careful in all recreational waters during this time of the year. Precautionary measures include avoiding contact with visible algae and swallowing water while swimming. Take a bath or shower with warm, soapy water after coming in contact with water in ponds and lakes, especially before preparing or consuming food. Pets and livestock should also not be allowed to swim in or drink untreated water from these sources. Exposure to blue-green algae during recreational activities such as swimming, wading, and water-skiing may lead to rashes, skin, eye irritation, and other uncomfortable effects such as nausea, stomach aches, and tingling in fingers and toes. If you should experience any symptoms after water recreational activities, please contact your doctor.

Livestock, pets and wild animals can be poisoned by the toxins produced by some algal blooms. Small animals can ingest a toxic dose quickly. Dogs are particularly susceptible to blue-green algae poisoning because the scum can attach to their coats and be swallowed during self-cleaning. Clinical signs of blue green algae poisoning in animals include vomiting, diarrhea, decreased appetite, weakness, seizures and sudden death, especially in livestock. If you see a blue-green algae bloom in the water or where you visit, do not allow pets or livestock swim in or drink from areas where blooms are seen. If pets swim in scummy water, rinse them off with soap and water immediately to remove the toxin. Do not let them lick the algae off their fur. Direct livestock to water sources away from algal infected waters. If your animal shows any of the clinical signs listed above, contact your veterinarian immediately.

For protection of human health from cyanobacteria, the World Health Organization (WHO) uses a guideline level of greater than 100,000 cells/ml and microcystin toxin levels of 20 parts per billion (ppb) for a high risk health alert in recreational waters. Indiana uses 6 ppb of microcystin toxin as a warning level. The WHO has not set a guideline value for the cylindrospermopsin toxin. Indiana will use 5 ppb as a warning level, consistent with the state of Ohio recommendation. Toxin results will be posted if they meet those threshold numbers. Exact cell counts and toxin levels can be found in the Test Results section of the web site. Swimming areas will stay on the High Count Alert until the cell counts fall below 100,000.