The mobile phone number was left by someone else by mistake, and the water company always sends text messages to itself.

The water supply company left your mobile phone number by mistake, causing you to receive text messages all the time. You can take the following steps to solve the problem:

1. Contact the water company and tell them that your mobile phone number was left by mistake, and ask them to delete your mobile phone number.

2. If you have already reported this problem to the water supply company, but you still receive the text message, you can reply to the text message and tell the other party that you don't need their service.

3. If all the above methods fail, you can try to contact the mobile phone operator and ask them to stop short messages from the water supply company.

I hope the above information is helpful to you.