UPSTATE — With weather warming up, people on the water should be on the lookout for algal blooms.

Algae and cyanobacteria are tiny plantlike organisms that can overgrow under the right conditions, according to the South Carolina Department of Health and Environmental Control (DHEC). Algal blooms are more likely to occur in late spring to early fall because water temperatures are warmer and there’s more sunlight.

Algal blooms on the surface of untreated lakes and rivers can be potentially harmful because some are caused by

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