Communal and community both come from Latin communis "common, of the community"—if a pool is communal, it can be used by the members of the community that owns it.

A communal well in a town without plumbing is a great idea. Until it runs dry, everyone can take responsibility for caring for their water source. A communal drinking cup is not such a great idea—accompanied as it is by possible infection.

Definitions of communal

adj for or by a group rather than individuals

“"dipping each his bread into a communal dish of stew"- Paul Roche”
“a communal settlement in which all earnings and food were shared”
belonging to or participated in by a community as a whole; public

adj relating to a small administrative district or community

communal elections in several European countries”

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