Toilet waste

Books such as Camps 6 list all public dump points in Australia that can be used for this.
Cheers

The camps books are great, but also there are web sites that list the points, for example this link.Dump Points
I am glad you mentioned the problems with dumping into wayside toilets. Unfortunately a lot of travellers either do not care or do not know the problems and a lot of smelly toilets are such because of irresponsible travellers.
Kevin

Most try to use dump points but a large number will drain into pit toilets or dig a hole out the back of a wayside stop. Unfortunately when the tank is full it seems it must be disposed of ASAP. You are right though Warren many folk dont understand the way a composting or septic system works & the problems emptying a chemical loo has on them. In short the majority of chemicals used to nuetralize the stink will also kill the bacteria in the toilets that break down the solids meaning they will smell & require pumping out more frequently.
Cheers Craig............

Firstly, Napisan products will not adversely affect the function of a septic tank.

Secondly, digging a hole and burying it is fine. All you're doing is putting a canister in the chain events between backside and ground.

Does the houseboat have a holding tank or a cassette under the bowl? If it is a removable cassette you may be able to motor to a town with a van park near the river that has a dump point you may be able to use that.