Ciprofloxacin
Cities measured
87
Detected in
87 / 87
Elevated / alert
4
Highest
0.18 μg/L — Delhi
Overview
Ciprofloxacin is a fluoroquinolone antibiotic — one of the WHO's critically important antimicrobials for human medicine. It is largely excreted unchanged and strongly adsorbs to sediments, creating persistent environmental reservoirs.
Health Relevance
The primary concern is not direct human toxicity but antimicrobial resistance (AMR) selection. Even at sub-inhibitory concentrations (ng/L), antibiotics promote resistance gene transfer in environmental bacteria.
Regulatory Limits
Drinking Water Directive 2020/2184
No EU drinking water limit. Under active AMR monitoring.
Controversy & Contested Science
A 2014 Bureau of Investigative Journalism investigation found major Indian generic drug manufacturers — supplying EU-branded antibiotics — discharging ciprofloxacin into rivers near Hyderabad at 45,000 μg/L — 1,000× the concentration promoting AMR. The EU imported these drugs under 'good manufacturing practice' rules that did not require environmental auditing of manufacturing sites. The WHO estimates AMR will cause 10 million deaths annually by 2050 — more than cancer — if current trends continue. Binding global environmental standards for antibiotic manufacturing effluent remain absent.