Without plumbing there is no civilization only barbarism as the Romans found out when they failed 3 times to conquer the Caledonians and Picts in Northern Britain from the 1st to the 3rd Century AD.
.... well, maybe past a certain size, waste management becomes an issue. But a tribe of a few dozen? Would you call any sort of tribal society (or even a dispersed agrarian society, a la mideival Europe) uncivilized? Remember, their version of plumbing was a chamber pot.
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