My water bill is split between 3 houses. 3 people in one, 2 in the other and then me. Should the bill be divided by 1/3 or 1/6?

Given the information that you have provided, I don't think it possible give well-informed advise. While the situation certainly sounds unfair, that in-and-of-itself is not enough. The most important information missing is the nature of your agreement with the landlord(?). Is there a signed lease? Is there a verbal agreement? Assuming that there is an agreement of some type in place, what were the agreed upon terms? If you would like to provide this info, then perhaps a more satisfactory answer could be given. If you would like to reply to this post that is fine, or if you would like to speak with me directly, please feel free to contact me at [email protected] . My initial consultations are always free of charge.