Earlier quoted context omitted.
Human
There is actually very little evidence for this. It is likely that it is mostly dog poop. EDIT: the comments in response are non-sequiturs. The map does not display mostly human poop. It is mostly dog poop. I know I know, you see people poop all the time. But that’s not what the map is.
I walk my kid to and from daycare in that area and see street pooping if not every week, three times a month. There's a reason why people move away from the city when they have kids. We are not far off from doing the same after almost seven otherwise very enjoyable years here.
I've "only" seen two discarded needles on the street the entire time I've been here though, one was outside of a major grocery store just before Thanksgiving.
The rest of the peninsula is pretty vanilla and mundane though. As are the parts of the city not an hour's walking distance from market street. It was very interesting visiting manhattan though, I'm not sure where everyone there goes, but their SOMA-style areas seemed overall cleaner than ours, which leads me to believe it's partly a city management issue.