Potable and drinking_water are not equal. drinking_water=yes means I can drink water straight from the source (tap, fountain, source) the water has been laboratory tested, so I know I can drink it without boiling.
Potable=yes/no means that water in any case should be boiled before consumption (raw water) because it has not been tested in the laboratory. That's the law. amenity=drinking_water it contains in itself the tag Potable=yes / no (no need to add it) amenity=drinking_water is antonyms for waste water/sewage
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