Why Campello needs this specifically
Campello’s dense triple-decker lots are less likely to be on septic (most are on municipal sewer), but any legacy or adjacent septic components are assessed with the same density-driven cross-contamination concerns as a sewer backup.
Shared sewer laterals in older triple-decker buildings mean a single backup or root intrusion event can flood more than one unit at once, and cross-contamination risk between units is real once black water is standing.
What to know before you call
Yard contamination from a septic overflow carries the same Category 3 hazard as an indoor backup — see the septic overflow hub for indoor/outdoor assessment details. See the full septic overflow cleanup breakdown →