Waterborne Disease
Illness caused by pathogenic microorganisms transmitted through contaminated drinking water.
SDG 3 Good Health & Well-beingSDG 6 Clean Water & SanitationWhat is it?
Waterborne diseases are infections — such as cholera, typhoid, dysentery, and rotavirus and cryptosporidium diarrhoea — spread when water contaminated by human or animal faeces is ingested.
Why does it matter?
Diarrhoeal disease remains a leading cause of death in children under five. Most of this burden is preventable with safe water, sanitation, and hygiene.
How does it work?
Pathogens enter water through faecal contamination, survive in the environment, and infect a new host on ingestion — the faecal–oral route. Interrupting any step breaks transmission.
Who benefits?
Reducing waterborne disease benefits whole communities through fewer illnesses, lower health costs, and more days in school and work.
Who may be disadvantaged?
Children, displaced people, and communities during floods or emergencies face the highest exposure and the fewest resources to respond.
What evidence exists?
Surveillance and outbreak investigations consistently trace clusters of diarrhoeal illness to contaminated water sources; interventions that improve water quality reduce incidence.
What tradeoffs exist?
Focusing only on water quality can neglect sanitation and hygiene, which are equally important — the “F-diagram” of faecal–oral transmission has multiple routes.
Common misconceptions
Boiling or filtering alone does not guarantee protection if water is recontaminated during storage, or if hands and food remain contaminated.
What you can do next
Learn the point-of-use methods that interrupt transmission and the community structures that keep them working.