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Levels of blue-green algae may be high during summer in some local lakes and reservoirs. Avoid coming into direct contact with the algae or swallowing lake water. Keep a close eye on pets or small children, who may ingest water containing toxins produced by these algae.
Exposure to blue-green algae during swimming, wading, and water-skiing can lead to rashes, skin, eye irritation, and effects such as nausea, stomach aches, and tingling in fingers and toes. After you swim, wade or ski, be sure to shower with warm soapy water.
Updated Aug. 11, 2016. Call property for latest conditions.
Low Risk: Don't drink the water. Shower After you swim. Indicated with blue diamond on sign.
Advisory: Swimming and boating permitted. Avoid contact with algae. Avoid swallowing water while swimming. Take a bath or shower with warm soapy water after coming in contact with lake water. Do no use lake water for cooking or bathing. Do not allow your pets to swim or drink water where algae are present. Indicated with yellow diamond on sign.
Caution: Follow all advisory level precautions. Children and those with compromised immune systems should not swim. Indicated with orange diamond on sign.
Closed: Algae and toxin levels make beach currently unsafe for swimming. Indicated with red diamond on sign.
Blue-green algae are a group of photosynthetic bacteria. They are most often blue-green in color, but can also be blue, green, reddish-purple or brown. When environmental conditions are just right, they can multiply quickly. Most species rise to the surface where they form floating mats but some stay suspended under the water’s surface.
The nutrients that cause an algae “bloom” come from excess or misapplied lawn and agricultural fertilizers, runoff from pastures, feedlots, lawns and golf courses, discharges from non-regulated (residential) sewage treatment systems and many other sources of organic nutrients. Other factors that aid in the growth of algae include sunlight, warm weather, and low turbulence. According to the Indiana Department of Environmental Management (IDEM) algal blooms are most common from May to October but may occur at all times of the year.
No. Many kinds of algae, most of which are microscopic and serve as an important supply of food for aquatic organisms, are found in Indiana lakes and streams. There are many types of blue-green algae too, and only 1/3 of them produce toxins. Toxins may be produced as part of the natural growth process of the algae and can be excreted into the water during growth or upon death.
Blue-green algae are capable of producing several different toxins. People may be exposed to these toxins through contact with the skin when swimming, inhalation when motor boating or water skiing or by swallowing contaminated water. Rashes, skin or eye irritation, and other uncomfortable effects such as nausea, stomach aches and tingling in fingers and toes may occur.
Animals are not necessarily more sensitive to blue-green algal toxins than humans. However, many animals enjoy being in the water. Animals may consume large quantities of algae if they drink the water. If blue-green algae happen to be producing toxin(s), the animals could become very ill. Symptoms may range from lethargy and loss of appetite to seizures, vomiting, and convulsions. Consumption of large quantities of the toxins could potentially cause death. Dogs are particularly susceptible because “scum” can attach to their coats and be swallowed during self-cleaning.
Blue-green algae can appear in a variety of forms. HABs have different colors and looks. Some colors are green, blue-green, brown, black, white, purple, red and black. They can look like film, crust or puff balls at the surface. They also may look like grass clippings or dots in the water. Some HABs look like spilled paint, pea soup, foam, wool, streaks or green cottage cheese curd.
Some blue-green algal toxins can accumulate in the tissues of fish. Recent studies in Ohio have determined that the flesh of fish is safe to consume. The World Health Organization advises that if you eat fish taken from water where a blue-green algae bloom is present, eat them in moderation and avoid eating the guts, where accumulation of toxins may be greatest. Do not cut into organs when filleting, and rinse the fillets with clean water to remove any liquids from the guts or organs before freezing or cooking/p>
No. Fossil evidence suggests that blue-green algae have been around for millions of years. Scientists have recorded blue-green algae blooms dating back to the 12th century and they have documented the toxic effects to livestock for more than 100 years. While it is important to remember that blue-green algae blooms have been present throughout history, recent blooms may have increased in frequency by the release of nutrients into our rivers, streams, and lakes.
Yes. Water treatment processes remove any toxins from blue-green algae. Do not use lake water for cooking or bathing.
Several agencies are working together to better understand blue-green algae blooms in our lakes including IDEM, the Center for Earth and Environmental Science at IUPUI, the Indiana Department of Health, the U.S. Army Corps of Engineers and the Indiana Department of Natural Resources Visual monitoring of many state-owned reservoirs and water sampling at many state beaches takes place during the summer. The beach sampling process follows this pattern:
Test results are posted at www.algae.IN.gov. Information signs are also posted at beaches that are being sampled, and if alert levels change because of an increase or decrease in indicators for blue-green algae, the appropriate colored diamond is placed in the white diamond-shaped space on the sign.
You can play a vital role in controlling algal blooms in nearby creeks, rivers, lakes, or reservoirs. Prevent blooms by limiting nutrient runoff. You and your neighbors can help in these ways: