Being on municipal sewer does not mean the whole run is the city’s problem. The lateral — the pipe from your house out to the main — belongs to the property owner, and that is the stretch that fails. Most Honolulu homeowners find this out on the day it backs up.
Older Honolulu neighborhoods still have clay and cast-iron laterals in the ground. Clay joints separate and let roots in; cast iron scales up from the inside until the bore is half what it was. Both fail slowly, then suddenly.


