- so how much filtering, for which contaminants, should they have to do? How often should they have to re-test the (probably municipal) water supply, to verify that their filtering is doing the job? And how much will they mark up the price of water for their tenants, to cover the expenses of all their extra filtering and testing?
There is a concentration of it where it becomes harmful.
>dependent on things the landlord doesn't control
They have the ability to filter water.