Columbia subject headings:
Drinking water--Health aspects.
Drinking water--Standards.
Water-supply.
Harvard subject headings:
Drinking water--Contamination
Drinking water--Health aspects
Drinking water--Microbiology
Drinking water--Standards
Water quality.
Water-supply
Princeton subject headings:
Drinking water--Contamination.
Drinking water--Health aspects.
Drinking water--Microbiology.
Drinking water--Standards.
Water quality.