Last year when my town installed a new sidewalk in front of my house, the contractor hired by the town dugged up the front yard too deep damaging the sewer lateral between my house and the main sewer line under the front street.
At first I thought I had a sewer line blocked by tree roots which happened several years ago. Attempt by a roto-rooter revealed something big was blocking the sewer lateral at about 125 feet away from home which was where the sidewalk was being installed.
I hired a private plumber who has done business with the town before so he knows whom to speak to investigate the situation taking pictures of the collapsed sewer lateral by a camera attached to a power snake confirming the city contractor indeed damaged the lateral.
My plumber tried to convince the town engineer as to what happedned with evidence back up by the camera. Meanwhile I wrote a strong letter to the mayor telling her what happened with ccs to neighbors in the several blocks where town is installing a new sidewalk, and town newspapers.
It took only a week the town admitted their wrongdoing and they dugup the front yard to replace the collapsed sewer lateral. I got all the cost re-imbursed (roto-rooter and my plumber's fees, about $1500 altogether).
Town chief engineer and the owner of the construction company were at my door to apologize. Mayor also called me to apologize. My letter cc-ed to town newspapers were never published.
My advice: Try to reach the top such as mayor to negotiate.
--151.204.xxx.xxx