Is there any charge for pipe dredging in residential buildings?

Specifically, whether it is within the warranty period, generally according to the national Regulations on the Management of Construction Engineering Quality Warranty, the water and electricity are two years, and the construction unit is responsible for the natural dredging (plugging before use) within two years; Man-made reasons are handled by the implementer. If it is impossible to distinguish who caused the cause, the relevant owners (residents) shall bear the handling expenses. After two years, it will be handled by the implementer. If it is impossible to distinguish who caused it, the relevant owners (residents) shall bear the handling expenses.