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Human health incidents involving toxic algal blooms (cyanotoxins) have been reported from at least 16 European countries. While no human deaths have been recorded, there are several instances of cattle, sheep and dog deaths, and numerous bird and fish kills have been ascribed to cyanotoxins after drinking untreated water. Hepatotoxic (liver) effects have been recorded more often than neurotoxic effects. WHO has developed guideline levels for cyanobacterial toxins in drinking water (Microcystin < 1 µg l^-1) and bathing waters (Microcystin < 10 µg l^-1).