Open defecation is also practiced in San Francisco. I have seen is occurring in front of my apartments and on the street. You can find human feces on almost any walk through SOMA, the Tenderloin or Civic Center area if you know what to look for (expert tip: dogs don't look for hiding places to poo). We have decided this is not a problem.
I'm not being entirely flippant; I'm originally from the Bay Area, and the filth is a significant part of the reason I live in Tokyo now. Regularly encountering human feces is one of several things I don't miss.