Science

deals with the medical and biological aspects

PubMed Central (PMC) is the U.S. National Institutes of Health (NIH) free digital archive of biomedical and life sciences journal literature.

WASH Sources Summaries and abstracts from the scientific literature

WHO publications – search engine

Guidelines for drinking-water quality -WHO

Center for Disease Control global Health

Wikipedia list of waterborne Diseases

Libertas Academica  publisher of 87 peer reviewed scientific, technical and medical journals.

Directory Open Access Journals  listing  of open access scientific and scholarly journals