In North Beach the minimum charge (4000 gallons) per quarter for water and sewer is around $150 plus the $15/quarter Flush Tax. The rates are slowly going up over the next few years to more accurately reflect costs, they hadn't been raised for years. Which I said at the time was a mistake. Chesapeake Beach is doing the same, they subsidized water/sewer rates for years out of tap fees from new construction and that pot of money finally ran out.
As note, in this area water is relatively cheap while sewer is, and will continue to be, expensive. The cost estimates for ENR requirements imposed a number of years ago for both upgrading of the treatment plants and treatment of the sewage were off by a factor of two or three.
My current bill is $350 (includes the Flush Tax) for 23,000 gallons. That's in line, although a bit high, with my historic usage, which usually runs between 18,000 gallons to 21,000 per quarter. Those numbers are in line with the numbers used to size systems for construction of households using between 50 gallons and 80 gallons a day per person.