IN.gov - Skip Navigation

Note: This message is displayed if (1) your browser is not standards-compliant or (2) you have you disabled CSS. Read our Policies for more information.

Addressing Concerns About Blue-Green Algae

May 1, 2014: Indiana Reservoir and Lake Update May 1, 2014: Indiana Reservoir and Lake Update

IDEM will begin blue-green algae sampling the week of May 12th and will end the week of August 29th. IDEM samples for blue-green algae and analyzes those samples for the type and quantity of blue-green algae present and for the following toxins which may be produced by certain types of blue-green algae: microcystin, cylindrospermopsin and anatoxin-a. For protection of human health from exposure to the algae and any of the toxins, Indiana will use the World Health Organization (WHO) guideline level of 100,000 cells/ml or a microcystin toxin level of 6 parts per billion (ppb) for a Recreation Advisory. Beaches will be closed if microcystin toxin reaches 20 ppb. The WHO has not set guideline values for cylindrospermopsin or anatoxin-a. Indiana will use 5 ppb of cylindrospermopsin and 80 ppb of anatoxin-a for a Recreation Advisory, consistent with the state of Ohio recommendations. 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 Cell Count Alert until the cell counts fall below 100,000.

The following swimming beaches will be sampled monthly unless cell counts are at 100,000 or greater, at which point sampling will be done biweekly until counts fall below 100,000.

May 12, 2014

  • Monroe Lake - Fairfax State Recreation Area
  • Monroe Lake - Paynetown State Recreation Area
  • Starve-Hollow State Recreation Area
  • Deam Lake State Recreation Area
  • Hardy Lake State Recreation Area

May 13, 2014

  • 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

May 19, 2014

  • Mississinewa Lake - Miami State Recreation Area
  • Potato Creek State Park - Worster Lake

May 20, 2014

  • Pokagon State Park - Lake James
  • Chain O’Lakes State Park - Sand Lake
  • Salamonie Lake - Lost Bridge West 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.