Pennsylvania tops other states in water-related diseases.
D004196:Disease Outbreaks / Q000453:epidemiology*; D005767:Gastrointestinal Diseases / Q000453:epidemiology*; D005873:Giardiasis / Q000453:epidemiology*; D006801:Humans; D010414:Pennsylvania; D011634:Public Health; D014871:Water Microbiology; D014873:Water Pollutants / Q000009:adverse effects*; D014881:Water Supply / Q000592:standards
D014873:Water Pollutants