I believe mussels are now (2025) protecting more cities.

What is cool about Warsaw is the TAWARA-RTM (TAp WAter RAdioactivity Real Time Monitor.

"Warsaw as the first city in the world is protected by a comprehensive system that is capable to monitor in real-time radioactivity of municipal water and by an innovative spectroscopy system capable to identify any detected contaminants"

https://www.ncbj.gov.pl/en/aktualnosci/state-art-system-moni...