My question involves an issue in Orange county, California. We moved into our house in 2013, our neighbor bought the house next door in 2015 and did some major remodeling work on his house. Around 2015-2016, we started experiencing sewer backup problem. We try to unclog and replace our pipe but it didn't help. Last week we had a contractor run the camera and marked the clog spot on the neighbor's driveway. He gave us permission to dig up and repair. When the contractor opened the pipe, he found a 4" liner pipe from the neighbor's house running pass the 6"shared pipe and block our drain access. We called the owner but he refused to come and observe the problem. He kept repeating that he didn't put the pipe their. The contractor proceedef to document with photos and removed the faulty pipe so we could resume access to the drain.
Should we ask the neighbor to share the cost of removing the faulty pipe? If he refuses (most likely since he's been avoiding to talk about it), what are our options to recover the cost?