Is there a sewer in my place where I live?

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

The method of separating sewage and rainwater and flowing them into sewer sewage pipes and rainwater pipes, respectively.
Combining sewage and rainwater into the sewer with a single drain pipe is a combined method.

Yokohama City Administrative Map Information Providing System (outside site)