$14 to $15 a month just me and my oldest boy here at home. Was a little more last month, my toilet was leaking into the bowl. I noticed it late one Saturday evening. My work week is Sunday thru half day Wednesday. So was later in the week before I fixed it. Didn't think about a water bill. It ran it up pretty good though.
You on North Baldwin Utilities? Mine is about 18-20 a month. 3 girls though.