Pump out stations are practically non-existent. My best recommendation is to
pump out
offshore off soundings, by which I mean over 300' of
depth. In the
Bahamas that's going to mean in the Tongue of the Ocean, or Exuma Sound, or similar.
The object is to not pump out in confined harbors or areas with little
current flow.
I have no ideas what the specific Bahamian laws are from location to location.
If you find it necessary to pump out while sailing across the banks, that's a lot better than pumping out in a small anchorage. It's a matter of doing what your common sense tells you is best, rather than worrying about what people will tell you are the fine
legal details.
In my experience most people in the Bahamas do not use holding
tanks to start with, unless they are in a confined area with little
current flow, or in severely populated
anchorages such as
Georgetown.
I'm going into my foxhole now.