A boil water advisory has been issued for approximately 200,000 residents across Dordrecht, Zwijndrecht, and Hendrik-Ido-Ambacht in the Netherlands. The advisory was prompted by the detection of E. coli bacteria in the drinking water supply. Authorities recommend boiling water for three minutes before consumption, including for drinking, cooking, and oral hygiene. E. coli is a bacterium commonly found in the intestines of humans and animals, and can cause gastrointestinal illness, particularly in individuals with weakened immune systems. The advisory will remain in effect until testing confirms the water supply is safe. Local officials are working to determine the source of the contamination and restore water quality. Residents are urged to follow the guidance to protect their health.