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<p>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.</p>
<p>Let me illustrate with some examples. So, these two cases are
clear:<br>
</p>
<ul>
<li>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</li>
</ul>
<ul>
<li>2. There is a sign that forbids it or warns that it is
contaminated -> drinking_water=no<br>
</li>
</ul>
<p>But what about these?</p>
<ul>
<li>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. </li>
</ul>
<ul>
<li>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.<br>
</li>
</ul>
<p>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.<br>
</p>
<p>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.<br>
</p>
<p><br>
</p>
<p>Cheers<br>
Tobias<br>
</p>
<div class="moz-cite-prefix">On 06.09.20 15:14, Mateusz Konieczny
via Tagging wrote:<br>
</div>
<blockquote type="cite" cite="mid:MGYYQmf--3-2@tutanota.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div>We have drinking_water:legal=yes for water that is officially
drinkable,<br>
</div>
<div>we have drinking_water:legal=no for water signed as not
drinkable.<br>
</div>
<div><br>
</div>
<div>Do we have tag for water sources (amenity=drinking_water,
drinking_water=yes)<br>
</div>
<div>that are neither officially or signably drinkable nor with
"not drinkable sign"?<br>
</div>
<div><br>
</div>
<div>drinking_water:signed=no ?<br>
</div>
<br>
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