The City is responsible for the maintenance of the sanitary sewer mains. Property owners are responsible for the service line from the house to the main. https://library.municode.com/co/fort_lupton/codes/municipal_code?nodeId=CH13MUUT_ARTISESY
Municipal Code Sec. 13-13. - General regulations for sewer service lines.
(b) The service line from the sewer main, including tap, to the structure served shall be installed, maintained, and repaired by the sewer user at his or her expense. No claim shall be made against the City on account of breaking or for the failure of the service of sewer, and no reduction in the rates will be made for any time that service pipes or fixtures are frozen or are not in proper working order. All connections, taps, and lines that are or will become the responsibility of the City for maintenance shall be inspected by the City’s authorized representative prior to being backfilled and used.
(c) The City shall be responsible for all maintenance and repairs to the sewer mains.