I also thought about case where 
water is commonly used as a drinking water
(for example camp site in mountains),
but there is no official testing or
official permission or any official oversight.
7 wrz 2020, 11:22 od [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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>>
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