The idea is to have a district where you can build those early hygiene facilities, then purification, recycling, etc.!
Sure, I get it. And floating ideas like this is just fine. I can't really help though if you are not clear on whether you are asking me to do this for you, or you are asking about how to do this yourself.
If you're asking me to do anything like this, please provide much more detail so I don't need to guess what you mean. As I've said, I'm not able to work on disasters, natural phenomena, etc. right now. Also, the districts work that I release to the community will always be based on the vanilla game techs, resources, civs, and so on, because that is the most generalizable. Doing so provides examples and tools for others to make districts for more custom scenario & mod implementations.
So, if you want something like a "garbage district", you need to answer
- What is the tech prereq?
- What buildings would be dependent on it?
As a starting point. If not using vanilla game techs, resources, or buildings, then you'll need to make this yourself. Defining dependent buildings is critical because those ensure the AI builds the district.
I'm also not inclined to add many more districts myself than I already am working on for the next release. As others have said, more is not always better, and having too many districts options by default would crowd the map, so we have to be thoughtful about that. My goals are to enable others to make up whatever districts they want, but also to allow newbies to start with default districts and understand and enjoy them without doing too much work.
I was thinking that maybe you could make a tutorial, about how to make and add various Districts... maybe that way you could "get rid" of more headaches and "crazier" ideas...

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Sure, I spent many hours doing exactly that. Did you read my "
Tips for Configuration and Modding" section on page one?
If yes, please let me know exactly what parts are still unclear and I can update them.