Which department should I look for when the external wall of the house leaks water?

Legal analysis: Waterproof maintenance belongs to the general obligation of the property agreed in the property service contract and should be undertaken by the property.

Legal basis: Article 942 of the Civil Law of People's Republic of China (PRC) stipulates that the property service provider shall, in accordance with the agreement and the nature of the use of the property, properly repair, maintain, clean, afforest and manage some owners in the property service area, maintain the basic order of the property service area, and take reasonable measures to protect the personal and property safety of the owners.