I installed a valve downstairs, and finally cut off the water supply upstairs. Is it illegal?

This is illegal. The owner and the downstairs are equal civil subjects, and both parties should perform their due obligations in accordance with the contract. Any party who violates it shall bear the corresponding liability for breach of contract. Downstairs can't be cut off from water and electricity, and it is illegal to urge owners to pay property fees. This time, legislation was passed to explicitly prohibit this operation downstairs.

Legal analysis

Downstairs has no right to do this. Generally, the owner and the property sign a property contract, and the property provides corresponding property services, while the owner has to pay a certain property management fee, and the water and electricity is a power supply contract signed by the owner and the water and electricity department. There is no cross relationship between them and they do not interfere with each other. Therefore, even if the property company has the right to collect water and electricity charges on behalf of the relevant departments, it has no right to cut off water and electricity for users because the owners have not paid the property management fee. If the property company illegally cuts off the electricity and water supply to the owners, causing losses to the owners, the property shall bear the corresponding liability for compensation. If the property cuts off electricity and water to the owner privately, then the property has constituted an illegal act. Like water and electricity, these are public services and compulsory. As long as the utilities are paid on time, even the power supply companies and water supply companies can't cut off water and electricity. Even the water supply and power supply department or the property management company authorized by the owners' meeting only has the right to collect and remit utilities. As long as the owner is not in arrears with water and electricity charges, he has no right to cut off water and electricity. If the property is found to be cut off from water and electricity without authorization, a lawsuit can be filed with the relevant department or court to demand recovery and compensation for the owner's losses. If the property privately cuts off water and electricity to the owner, the losses caused are relatively large and may be prosecuted.

legal ground

"Property Management Regulations" Article 44 In the property management area, water supply, power supply, gas supply, heating, communication, cable television and other units shall charge relevant fees to the end users. Where a realty service enterprise accepts the entrustment to collect the fees mentioned in the preceding paragraph, it shall not collect additional fees such as handling fees from the owners.