The dump station tagging proposal has been cleaned up and migrated: http://wiki.openstreetmap.org/wiki/Tag:amenity%3Dsanitary_dump_station A related mechanical edit has been completed. Other than some canal pumpouts in the UK, the world now is using just one tag for this feature.
-- I encourage people to get out and map s'more. amenity=sanitary_dump_station is valid if you know the exact spot(s), else sanitary_dump_station=yes can be added to the parent node (e.g. the camp site, gas or grocery station that hosts the dump). -- Prior tagging of this feature included a number of man_made=wastewater_treatment_plant, man_made=pumping_station, and landfills mistakenly tagged as toilet dump stations. A number were just name=Dumping Station with no other tags.
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