State officials say they'll continue testing waterways for blue-green algae ahead of the Labor Day weekend.
Blue-green algae growth, known as cyanobacteria, is made up of microscopic organisms that naturally occur in streams and lakes. Much of it is harmless, but some can produce toxic chemicals that cause sickness in people and pets.
READ MORE: Two Lake Monroe Beaches Under Algae Advisory
The Indiana Department of Natural Resources is posting testing updates online . Officials started testing waterways around Memorial Day and will finish before Labor Day.
High counts have been detected in several lakes, including Lake Monroe. The advisory applies to two beaches: Fairfax and Paynetown state recreation areas.
People can still swim and boat in those areas, but IDEM says to use caution and make sure to take a warm soapy shower after coming into contact with lake water. IDEM also advises swimmers not to swallow any water.
There's also an advisory in effect at Lake Lemon, but that is because of elevated levels of E. Coli.