Since we're on the topic, are there regulations about sewerage for longboaters? Are there "hookups" available at mooring spots or is it more of a "well it all gets diluted when we dump it in the river" kind of thing?
You're not allowed to dump any human waste in any of the canals or rivers (ignore the fact that plenty of companies in the UK do this...).
There are two common approaches to dealing with human waste aboard canal boats; cassette toilets which you can carry to 'elsan points' placed frequently along the canal to dump semi-regularly (I hear anything from a week to a month depending on how many aboard). They look like [1] - you remove the bottom bit and carry that to empty. And secondly, pump-out tanks with a macerator toilet which chews up the excrement before being deposited into a tank. They're much bigger so need to be emptied less often (over 3 months for our 500 litre beast). They need to be done at marinas or the ever-decreasing number of Canal and River Trust-maintained self-pumpouts. Costs about £10-17 per pump-out. Elsan disposal is free as is covered by your license fee. Hundreds of thousands of words on forums have been written about the pros and cons of either of these approaches, and is considered on the canalworld forum to be a bit of a holy war.
A much less common approach is composting toilets. There's not a lot of room on boats, so storing the waste long enough to turn into an effective compost doesn't seem too feasible. And then once it's done, what are you gonna do with it? You're on a boat, you don't have a garden. And recently CRT informed people that they cannot dispose of this compost toilet waste in their provided refuse bins.
