Why Cully faces sewage backup risk
Cully is the one area on this list where septic-system relevance is real, not a generic claim — most of Portland is on municipal sewer.
Cully was annexed into Portland later than many of the city’s core neighborhoods.
The area was historically semi-rural before urban infill development.
Infrastructure was incrementally extended rather than built out in a single wave.
A later municipal sewer connection with mixed septic-to-sewer conversion history, incrementally-extended infrastructure varying block to block, and later infill tying into an unevenly-upgraded grid all mean Cully carries genuinely different — and higher — backup and septic-relevant risk than more central neighborhoods.