On 12/11/2014 9:35 AM, tagging-requ...@openstreetmap.org wrote:
A "non-potable water" introduces two problems:
1) a mapper may not know if the water is potable or not; there may be no
way to check it or he may not be able to do it; still adding a water source
is useful;
2) I don't like creating too many top-level tags. I could live with it,
however, as long as we don't have a better defined tagging system. But the
previous item is still an issue.


>  "nonpotable_water" and "drinking_water" also have no overlap, which is
>good.
>"drinking_water" and "water_tap" overlap.
>
>
So what's your suggestion for a water source of unknown potability?


Cheers,
Kotya

Where something is 'unknown' one assumes its quality/specification to maintain safety. Thus a water source of unknown potability should be tagged as "nonpotable_water" as this maintains safety.
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