Is it illegal for the property to stop water for no reason?

Legal analysis: illegal. The owner and the property management company are equal civil subjects, and both parties shall perform their respective obligations in accordance with the contract. If either party breaches the contract, it shall bear corresponding liabilities for breach of contract.

Legal basis: Article 44 of the Regulations on Property Management. Within the property management area, water supply, power supply, gas supply, heating, communication, cable TV and other units shall charge relevant fees to the end users. If the owner signs a contract with the water supply and power supply company and pays the corresponding fees to the water supply and power supply company, the water supply and power supply company shall supply water and power. The property company is not a party to the water supply and power supply contract and has no right to interrupt the water supply and power supply to the owner without authorization.