>Monday, September 7, 2020 4:23 AM -05:00 from Tobias Zwick 
><[email protected]>:
> 
>The discussion went astray a bit, partly because I think it was not clear why 
>Mateusz proposed to use the drinking_water:legal=yes/no/unknown at all, if 
>there is already the tag drinking_water=yes/no.
>Let me illustrate with some examples. So, these two cases are clear:
>*  1. There is a sign that says you can drink it or it is otherwise clear that 
>you can (drinking fountain constructed by muncipality) -> drinking_water=yes
>*  2. There is a sign that forbids it or warns that it is contaminated -> 
>drinking_water=no
>But what about these?
>*  3. There is no sign at all and no clear indication whether it is drinkable 
>or not. Water that comes out of a mountain might be polluted with toxic 
>substances, especially if it is close to an (old) mine. 
>*  4. There is a sign that simply says "no drinking water" but it is clear 
>from the circumstances that it is. Don't have a good example right now, maybe 
>because of insurance, or nearby shop wants to sell bottled water.
>In case 3, where a surveyor cannot with certainty determine if it should be 
>drinking_water=yes or no (without trying it himself and waiting if he becomes 
>ill or not, which can't be expected of the surveyor). So in this case, he 
>would need to leave drinking_water untagged. But what he can with certainty 
>record is that there is no official information about it whatsoever. This is 
>useful because people searching for drinkable water would certainly prefer 
>water sources where it is positive that it is drinkable. 
>drinking_water=unknown or drinking_water:signed=no would solve this, but there 
>is also case 4.
>In case 4, the official information would deviate from the actual situation 
>on-site, which could warrant to record these two informations separately when 
>necessary.
> 
>Cheers
>Tobias
>On 06.09.20 15:14, Mateusz Konieczny via Tagging wrote:
>>We have drinking_water:legal=yes for water that is officially drinkable,
>>we have drinking_water:legal=no for water signed as not drinkable.
>> 
>>Do we have tag for water sources (amenity=drinking_water, drinking_water=yes)
>>that are neither officially or signably drinkable nor with "not drinkable 
>>sign"?
>> 
>>drinking_water:signed=no ?  
>> 
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