Sorry to hear this OP. As someone who dealt with a trash ass neighbor with sometimes out of control kids in for years, I know how frustrating it is. Sadly, my neighbor was a homeowner and I got fined twice for garbage they sat in front of my house! Went to court to fight and it was a not a good experience. My experiences with 311 however were always pretty decent, but this was Pre-COVID.

Maybe get the media involved to put some pressure on HCD? It's poor oversight and management by agencies like this that give affordable housing a bad name and why nobody wants it in their neighborhoods. Families may need real wrap around services to deal with a multitude of issues, not just a roof to improve the quality of their lives and maintain quality of life for the neighborhoods they are placed in.