The sewer blocked the property or the owner paid for it.

Property companies provide maintenance, security and other property services in accordance with the provisions of the property service contract, so whether the property company bears the responsibility depends on whether it breaches the contract.

According to the contract, the property management company has the obligation to maintain and repair the public facilities and equipment in the community. The blockage of the sewer pipe caused losses. First of all, we must find out what is the cause of sewer blockage. If it is because the sewer pipe is in disrepair for a long time, and the property management company fails to find the maintenance in time, which leads to the overflow of the owner in the normal use process, then the property management company fails to fulfill the maintenance obligation agreed in the contract and should bear the liability for breach of contract. If it is caused by improper use of the upstairs owner, such as throwing some garbage into the sewer pipe, which affects the normal drainage of the sewer pipe, then the upstairs owner should compensate. In this case, if the property management company has done its duty of reasonable care and failed to do its duty of finding faults and maintaining them in time, then the property management company will not bear the responsibility.