Talk:Toilet Holding Tank Disposal

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The basic styles of holding tank station seem to be:

  • elsan point (walk up dumping basin)(also called a CDP or CTDP)
  • round drain (gravity drain hose : 3" in diameter in the USA)
  • pump-out (mechanical suction).


  • Gray water (usually)
  • Bilge water (rarely)
  • Black water (usually)
  • Black water but not gray water (occasionally)


  • Certain tank chemicals

Offering at the same location:

  • Rinse water which may not be potable.
  • Drinking water (amenity=water_point).
  • Drinking water (amenity=drinking_water).
  • Walk up toilets.

Access Rules:

  • From water or land, or in a few cases both.
  • Free, paid in advance, pay at the pump with coins or cards, or pay at the office.
  • Part of regional network or not (card key, payment card).
  • Accessible to overnight guests only, or to everyone.

Position may be:

  • Located on a dock next to waterway=fuel (often)
  • Located on a separate dock.
  • Located on land, even it only serves marine users.
  • Located at each camping pitch.
  • Located at a central location, with varying degrees of accessibility by large boats or motorhomes (often).
  • Unknown (many RV and Marina sites list dump services on their websites, but the exact location does not appear on the brochure or map)(often).
  • Associated with a walk up toilet, or not.

There are combination stations that have one or many of the above features.