Yes, but it depends on the treatment.
https://daily.jstor.org/a-history-of-human-waste-as-fertilizer/
Urine decomposes much more easily in the environment.
The process with feces is more complex.
Apart from that, it is dangerous to contaminate a water source.
Something simpler would sometimes be that land is valuable simply for the sake of being able to cultivate it, not just for the extraction of resources.(Minerals).
It adds a layer of handicap but with the resources that the game has, such as animals and plants, it can improve the natural capacity of the soil.
Civilizations developed near water sources and where they had domesticable animals.
These are maps of the origins of crops.
Origins of Agriculture. Vavilov’s original map of the origins of agriculture ( 1 ) Mexico-Guatemala, ( 2 ) Peru-Ecuador-Bolivia, ( 2A ) Southern Chile, ( 2B ) Southern Brazil, ( 3 ) Mediterranean, ( 4 ) Middle East, ( 5 ) Ethiopia, ( 6 ) Central Asia, (7) Indo-Burma, ( 7A ) Siam-Malaya-Java, ( 8 ) China. (Image from Wikimedia Commons)
Animal Domestication.