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Is it illegal for the property to change the drainage pipeline without authorization?

Within the management scope of the property management company, it is an important duty to transform the drainage pipeline, and there is no so-called "ultra vires"!

If the renovation of the drainage pipeline by the property company affects the smooth flow of the whole drainage system, it is not illegal, but the design is defective or unreasonable. You can redesign or stop the renovation of the drainage pipeline and restore it to its original state.