Related by context. Frequent words. (Click for all words.) 56 bilharzia 54 mold fungi 54 Hydrogen sulfide 54 diarrhea dysentery 53 waterborne illness 53 Bacterial infections 53 E coli bacteria 52 malaria diarrhea 52 e coli bacteria 52 fecal material 52 waterborne disease 51 Toxic chemicals 51 cholera dysentery 51 Chlorinated 51 waterborne illnesses 51 Buruli ulcer 51 Schistosomiasis 51 salination 51 salinization 51 sicken humans 51 THMs 50 corrosives 50 toxic residues 50 Chlorination 50 trigger allergic reactions 50 Soil erosion 50 Artibonite river 50 intestinal infections 49 diarrhea pneumonia 49 giardia 49 stagnant pools 49 Polluted 49 irrigating crops 49 harmful microorganisms 49 heavily polluted 49 polluted 49 Methylmercury 49 diarrhea stomach cramps 49 Kala azar 49 contaminate groundwater 49 pneumonia bronchitis 49 naturally occurring arsenic 49 giardiasis 49 Raw sewage 48 polluting waterways 48 potent toxin 48 aspergillus 48 toxicant 48 Diesel exhaust 48 intestinal worms 48 deplete oxygen 48 microbial contaminants 48 polluting groundwater 48 carbaryl 48 Disinfecting 48 contaminated 48 rat poisons 48 Hydrochloric acid 48 pseudomonas 48 cat dander 48 salmonella E. coli 47 polluted waterways 47 harmful contaminants 47 contaminates 47 tannic acid 47 potent neurotoxin 47 Dust mites 47 insect repellants 47 sewage effluent 47 mosquito transmitted 47 typhoid cholera 47 Cryptosporidium 47 recontamination 47 chemically contaminated 47 acidify 47 Prenatal exposure 46 organochlorines 46 Coliform 46 carcinogenic chemicals 46 tributary rivers 46 naturally occurring bacteria 46 causes botulism 46 phosphorus pollution 46 Salmonellosis 46 arsenic concentrations 46 avian botulism 46 nitrate contamination 46 contaminate 46 shigella 46 encephalitis inflammation 46 highly communicable 46 freshwater habitats 46 herbicides pesticides 46 locust infestation 46 swimmer itch 46 toxic algae blooms 46 poisonous chemicals 46 contaminating groundwater 46 nitrates 46 diazinon 46 contaminate drinking