Thanks everyone's advise! In California or at least the city I have that rental, whenever tenant doesn't pay the water bill, the property owner is responsible for the past due, and the city will put a lien on property if the past due is more than 60 days. So in this case, even the tenant transferred the water, I, as the owner, will end up footing the bills. But definitely I'll want to see their account numbers before I hand over the keys next time!
I like the idea to add the utilities to the ledger and the money paid will go to utility first and rent, then send them the monthly statement.
Some update after I stopped by the property this afternoon: I first rang the bells several times but no answer so I left the property. But before I got back to my car, i saw the daughter went into the property so I knew then there is people in the property. I went back and rang the bells again three times but still no answer. After I left again, I saw a text message from the tenant saying that they have COVID and are quarantining inside so they couldn't open the door. At least they are sending me something rather than radio silence to any texts, emails or calls. I then texted back telling her I wanted to understand her situation and when she plan to pay the bills. She told me she will pay by Thursday and apologized on lack of communication. We will see if I get paid on Thursday. But at least I got some responses. Nina