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I want to map a sanitary disposal station for boats to empty their chemical toilets.

Using I have found a number of tags for this and they are not applied consistently at all:

amenity=sanitary_dump_station - 3 109 instances
sanitary_dump_station=yes - 2 579 instances
waterway=sanitary_dump_station - 470 instances
waste=excrements = 92 instances
waste=solid_waste = 92 instances
waste=toilet = 68 instances
waste=excrement = 17 instances
waste=chemical_toilet = 11 instances
waste=Solid␣Waste = 6 instances
waste=toilets = 6 instances
waste=human_excrement = 3 instances

All of these are interchangable. I'm inclined to use waterway=sanitary_dump_station as these are specific to boaters. However I feel like many of these other tags could be useful when searching for these facilities - is it acceptable to tag more than one synonymous tag? For example, the following three:


Or if I choose one of these tags, would it be acceptable to standardise the tags across the country (or the whole map)?

There are also some extra fields in the sanitary_dump_station namespace that are a bit more specific:

sanitary_dump_station:pump-out = 384 instances
sanitary_dump_station:chemical_toilet = 308 instances
sanitary_dump_station:basin = 207 instances
sanitary_dump_station:gravity = 195 instances
sanitary_dump_station:suction = 98 instances
sanitary_waste_station:chemical_toilet = 1 instance

I'd like to apply these where applicable, too. These aren't synonymous.

asked 04 Jul '19, 19:29

ivansams's gravatar image

accept rate: 0%

I would only tag it the way most people tagged it, thus as amenity=sanitary_dump_station. It also has a wiki page and an accompanying page giving an overview. It seems like all the other tags were proposals, but only this one got approved.

If you really do not agree with a certain tagging scheme (because it lacks details, is just plain wrong or another good reason), you could use an alternative tagging schema, otherwise, stick with the approved or most popular one. There is, in general, no reason to use tags from 2 schemas when one is approved.

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answered 05 Jul '19, 04:24

escada's gravatar image

accept rate: 21%

Agreed to escada's answer.

Adding to that: amenity= and waterway= are primary tags. Either could be used for the feature in general but you should only use one. I'd go with amenity=sanitary_dump_station as there is no principal difference between a dump station for boats or road vehicles. So why let the former stand out by using waterway?

sanitary_dump_station=yes on the other hand should only be used as a secondary tag. If you for example map a marina as one big feature and only want to indicate that is possesses a dump station without mapping it individually you would add sanitary_dump_station=yes to the marina object.

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answered 05 Jul '19, 10:09

TZorn's gravatar image

accept rate: 15%

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question asked: 04 Jul '19, 19:29

question was seen: 1,066 times

last updated: 05 Jul '19, 10:09

NOTICE: is no longer in use from 1st March 2024. Please use the OpenStreetMap Community Forum