Contamination
"Presence of substances, for example microorganisms, chemicals, waste or sewage, which renders water unfit for its intended use." (United Nations Publications, 2013)
Sources
United Nations Publications. "Glossary of Shared Water Resources (English-Arabic): Technical, Socioeconomic and Legal Terminology." (2013). DOI:https://dx.doi.org/10.18356/70b462ce-en