Is it illegal for Jilin property to clean up the snow in sewers?

It is illegal for Jilin property to clean up the snow in sewers. According to relevant public information, it is illegal to pour ice and snow into sewers. A large amount of snow containing garbage such as peels, branches and plastic bags is poured into the drainage well, which will cause pipeline blockage and poor drainage. In some well sections, snow freezes, blocking the pipeline and paralyzing the drainage system. If snow with snow melting agent is poured, it will not only cause great damage to the drainage pipeline, but also affect the sewage treatment process, resulting in the failure of water storage capacity. In addition, if the manhole cover is opened artificially, it can't be covered in time or tightly, which also has certain safety hazards to pedestrians.