Looking for a property, the property said that the pipeline connecting the well with the residents was frozen, and the owner was responsible.

Even the pipes connecting the sewage well and the residents are frozen, because they belong to the public main line (because all the property management regulations in the city, including the Property Law, have such provisions), so they should be handled by the property, which has the responsibility to maintain the public pipelines, equipment and facilities. Besides, according to what you said, the temperature there should be relatively low in winter. If the main sewer pipe freezes every winter, it is not appropriate for the residents in the building to pay. Besides, the main sewer is not suitable.

However, in some cases, residents in your building have to pay maintenance fees. For example, the residents on the second floor will return the dirty water indoors due to the blockage of the sewer trunk (for example, the debris discarded by the upstairs residents from toilets, sinks and other places leads to the blockage of the sewer trunk). If you can't find the responsibility of the upstairs residents, you can sue all the upstairs residents, and the court will judge all the upstairs residents to share the maintenance costs, without special circumstances.