|SFist - New Plan for Valencia St Gutters|
Which is a good thing, because SF has old sewers that can really present problems.
|SFGate Inner Richmond Sinkhole|
|Exponent - Sea Cliff sinkhole|
Sewer lines are clearly relevant to real estate, and to potential development, such as the planned 8 Washington project. So, again I say, inspect and care for your sewer line, because you are responsible for it till it meets the city line, and prevention is always better (and cheaper!) than crisis repair. In Marin the sewer systems are managed by individual or combined districts, more info can be found here.