Ibuprofen
Cities measured
87
Detected in
87 / 87
Highest
0.18 μg/L — Beirut
Overview
Ibuprofen is one of the world's most consumed over-the-counter medications. It reaches water via excretion (the body does not fully metabolise it), hospital effluent, and improper disposal. Conventional wastewater treatment removes 20–80%, leaving significant quantities in treated effluent.
Health Relevance
At environmental concentrations (ng/L), ibuprofen has no acute effect on humans. Ecotoxicologically, it inhibits prostaglandin synthesis in fish and invertebrates at μg/L concentrations, potentially impairing reproduction.
Regulatory Limits
Drinking Water Directive 2020/2184
No EU drinking water limit. On EU Watch List for monitoring since 2015.
Controversy & Contested Science
The pharmaceutical industry argued early that water concentrations were 'thousands of times below therapeutic doses.' Environmental scientists countered that (a) combined exposure to multiple pharmaceuticals (the 'cocktail effect') was unknown; (b) endocrine effects could occur at sub-therapeutic concentrations; and (c) aquatic organisms spend entire lifecycles in contaminated water. The EU Watch List was formally established in 2018 — 15+ years after pharmaceutical contamination was first documented. Advanced treatment (ozone, UV/H₂O₂, activated carbon) removes most pharmaceuticals but is expensive and not yet mandatory under EU law.