Related by context. Frequent words. (Click for all words.) 70 microcystin 63 E coli bacteria 63 toxic algae 60 toxic algae blooms 60 toxin 60 swimmer itch 60 Algae blooms 59 algal bloom 59 potent neurotoxin 58 Turbidity 58 E.coli bacteria 58 Hydrogen sulfide 57 Domoic acid 57 amphipods 57 THMs 57 Enterococcus 56 pseudomonas 56 harmful microorganisms 56 enterococcus 56 contaminant 56 Rotenone 55 toxicant 55 Didymo 55 Hydrilla 55 coliforms 55 fecal material 55 dissolved oxygen levels 55 microbial pathogens 55 Cryptosporidium 54 bacteria 54 ciguatera 54 protozoan 54 bioaccumulation 54 E.Coli 54 freshwater mussels 54 enterococci 54 macroinvertebrates 54 contaminants 54 toxic algae bloom 54 chlordane 54 giardia 53 micro organism 53 harmful pathogens 53 methyl mercury 53 Contaminant 53 dieldrin 53 mold fungi 53 neurotoxin 53 algae blooms 53 trigger allergic reactions 53 Poison ivy 53 toxins 53 fecal coliform 53 aquatic organisms 53 Giardia 53 deplete oxygen 53 algae 53 fathead minnows 53 suspected carcinogen 53 E Coli 53 benzo pyrene 52 invasive mussels 52 Legionella bacteria 52 cryptosporidium 52 airborne particulates 52 Pfiesteria 52 viral hemorrhagic septicemia 52 carbaryl 52 aspergillosis 52 e coli 52 Toxoplasmosis 52 algal blooms 52 Stormwater runoff 52 fecal bacteria 52 microscopic algae 52 bacterial 52 potent toxin 52 E. coli 52 melioidosis 52 whirling disease 52 fecal coliform bacteria 52 naturally occurring bacteria 52 E.coli 52 toxicants 52 disinfection byproducts 52 giant salvinia 51 endocrine disrupting chemicals 51 legionella bacteria 51 cryptosporidiosis 51 aquatic invertebrates 51 endocrine disruptor 51 Salmonellosis 51 E coli 51 Diesel exhaust 51 Tularemia 51 harmful algal blooms 51 rock snot 51 larval stages 51 Vibrio 51 parasitic worm 51 aquatic habitats