| Inland HAB Taxa (Specific organisms of concern) | Adverse Impacts | Toxins |
| Cyanobacteria | Human and animal health impacts; water discoloration; unsightly and foul-smelling scums; hypoxia from high biomass blooms; taste-and-odor problems in drinking water and farm raised fish | Hepatotoxins (include microcystins), neurotoxins, cytotoxins, dermatotoxins, respiratory and olfactory irritant toxins |
| Haptophytes (e.g., Prymnesium parvum) | Fish kills | Ichthyotoxins |
| Chlorophytes | Discolored water, localized hypoxia | -- |
| Macroalgae | Unsightly and foul-smelling mats, localized hypoxia, clogged water intakes | -- |
| Euglenophytes | Discolored water, fish kills | Ichthyotoxins |
| Dinoflagellates | Fish kills | -- |
| Diatoms | Produces large amounts of extracellular stalk material resulting in ecosystem and economic impacts | -- |