Water and sewer charges are billed quarterly. Billable water charges consist of the amount based on your quarterly water consumption (the amount of water that passed through the meter since the last meter reading) plus a fixed Ready to Serve Fee. The consumption is billed on a tiered schedule (i.e., the first 8,000 gallons are billed at a certain rate, the next 8,000 gallons or portion thereof are billed at a different rate, etc.). Billable sewer charges consist of a fixed amount based on your total quarterly water consumption plus a fixed Ready to Serve Fee. If you only have wastewater (sewer) service through Frederick County, you are charged a fixed flat rate wastewater charge per quarter.