I noticed that tagging without drinking_water=no/yes can have one weakness if the water is contaminated permanently with metal salts of heavy metals and other chemical compounds poisonous. Maybe can solve this problem using hazard=* e.g.? natural=spring / amenity=drinking_water drinking_water:legal=no (when it is a microbiological threat it is not so bad) hazard=poison (when contaminated with heavy metal salts, water can not be clean by boiling)
https://wiki.openstreetmap.org/wiki/Proposed_features/hazard Regards Slavo
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