Is the water safe to drink in
Tap water safety in Bulgaria
In general, the water may be safe to drink in Bulgaria. Basically, the water is chlorinated and locals drink it from the tap with no problems. However, some strains of E. coli which you may not have immunity for, could be present in small concentrations causing diarrhea. Bottled water is recommended for the first few weeks while your body develops immunity.
City tap water safety info for Bulgaria