Which department should I look for when the ground of the community sinks?

Legal analysis: it definitely belongs to the property management in the management area, just depending on who pays for the maintenance. If it is the ground subsidence of the new community, you can find the developer. If it is an old community, it depends on what causes the settlement and find the responsible party. For example, the settlement caused by subway construction can be found by subway development and construction units. If it is a natural settlement, the old community can only find the owner and pay the maintenance fee from the maintenance fund.

Legal basis: Article 281 of the Civil Law of People's Republic of China (PRC), the maintenance fund of the building and its ancillary facilities belongs to the owner. With the consent of the owner, it can be used for local maintenance, renewal and transformation of elevators, roofs, external walls and barrier-free facilities. The collection and use of maintenance funds for buildings and their ancillary facilities shall be announced regularly. In case of emergency, if the building and its ancillary facilities need to be repaired, the owners' assembly or the owners' committee may apply for the maintenance funds of the building and its ancillary facilities according to law.