The sewer on the first floor is always blocked, and the property is not allowed to change the pipeline or do it. Can the pipeline be forcibly changed?

No, if the public equipment is changed without authorization, the property management company can ask the owner to restore the original state and claim compensation for the losses caused by it.

You can find a property management company to repair it. If the maintenance can't meet the requirements, you can complain to the neighborhood offices and the Housing Authority in your area.

If there is still no response, it can be resolved through litigation.

At present, there are many shortcomings in the state's supervision of the service quality of property companies, which leads to the high cost of owners' rights protection. You can also take extreme measures, such as looking for the media.

Another way is to negotiate with the property, but the negotiation results must be written and have the official seal of the property company (it must be the official seal)