Who's responsible to pay for water?

[Mandy Silveira]

This is for a California home rental that is in the country and has well water. In this scenario, it is too costly to do monthly water testing, so only quarterly testing will be done. To ensure clean drinking water, the landlord will be providing bottled water delivery, but will be passing that cost along to the renter. The renter doesn't think they should have to pay for the bottled water, but it is my understanding that the landlord is only responsible for PROVIDING the water, not paying for it. Am I missing something?