Shared sewer line with neighbor

[Deryck C.]

Hello BP community I need help, I bought a sfh rental in OKC back in 2021, did the full inspection, and everything looked great. Recently since August 2024, I've had countless flooding issues, and my plumber had to excavate my living room & backyard last month. My plumber found that my sewer line was shared with my next door neighbor who is the corner house. My plumber said that the city of Oklahoma doesn't have any records of the 2 properties sharing a sewer riser and that the Y locate riser are also facing the wrong direction, which is not legal according to my plumber. I showed the documents and invoices to my home insurance and my title insurance, and they both denied coverage or compensation. I do not know who else to get in touch with, and my plumber said the city will want me to replace my entire sewer line. I do not have contact with the previous owner and my old realtor told me to seek an attorney. Before I do search for an attorney, I would like to know what you would do in this situation or who should I seek for who's liable for this. 

Any advice is greatly appreciated. Thank you for your time.

[Joel Bongco]

Aloha @Deryck C.,  how far is the "Y" from the City Lateral?  You might want to have the line camera'ed if you haven't done so already.  I would also get some quotes to fix the current issue.  You may want to compare the cost of litigation to the cost of repairs.