I received my bill and it was the highest of the year.  Though I know I had a day when the toilet ran for a couple of hours.  I know the water rates have not changed.

I'm wondering if you found a reason why it was so high?  Does your bill show higher consumption than usual?  If the bill says you had higher consumption have you contacted United Water?  They can check their records to see if there was a specific day with an unusual amount used or if it was something that happen over multiple daysl.