Lake County health officials have posted warnings on Lake Erie beaches after a toxic blue-green algae bloom was found in Fairport Harbor. The substance could make people and pets sick, causing skin rashes, diarrhea and other health problems. Algae feeds on the phosphorous from raw sewage. The blooms were created when storms this week led to sewage overflows. A report released in late June by the Natural Resources Defense Council shows Ohio beaches are among the most polluted in the Great Lakes Region, thanks to raw sewage and farm fertilizer runoff. The director of the Ohio Sea Grant office says algae blooms in eastern Lake Erie are unusual, while blooms in the western basin are typical and may last months. But Fairport Harbor resident Mark Sabalausky says the blooms are everywhere.