Agricultural Experiment Station
South Dakota Department of Environment and Natural Resources
South Dakota State Health Laboratory
South Dakota Geological Survey
East Dakota Water Development District
South Dakota Certified Drinking Water Lab
South Dakota Association of Conservation Districts
NSF International The Public Health and Safety Company
EPA's Safe Drinking Water Hotline
EPA's List of Water Contaminants and Maximum Contaminate Levels
North Dakota Water Resources Research Institute at NDSU
University of Minnesota Water Quality Program