Where I live, is the sewer coming?

We can know by confirming "public sewer service start area figure" from Daichan map of Yokohama-shi administrative map reporting system.
The colored part on the map is the place where the sewer can be used.

The method of separating sewage and rainwater into the sewage pipe and rainwater pipe of the sewer, respectively, is a diversion type.
The combined method of combining sewage and rainwater into the sewer with a single drain pipe is a combined method.

Yokohama-shi administrative map reporting system (outside site)