How to Read Your Water Bill

WSSC Water customers have a bill that is simple and easy to understand, but if you need help, here is a rundown of important information and key terms used.


Billing Period WSSC Water bills residential and some commercial customers quarterly or every three months.
Water and Sewer Usage Water/sewer charges are all measured per 1,000 gallons of use. At the beginning of each fiscal year in July, if rate changes occur, the old and new rate charges will be reflected on the bill.
Bay Restoration Fee The Bay Restoration Fund Fee is calculated based on the number of days in the billing period. Formerly known as the "flush" tax fee generates revenue to fund improvements to water resource recovery facilities throughout the state. State law requires WSSC Water to collect the fee on behalf of the state of Maryland. WSSC Water offers a Bay Restoration Fee Financial Hardship Exemption Program for customers who can demonstrate that paying the monthly "flush tax" fee creates a financial hardship. To learn more about the program visit the Bay Restoration Fund page where you can access an online exemption application, or you may call 301-206-4001 to have a form mailed to you.
Ready-To-Serve-Charge* There are two components to this charge:
  Account Maintenance Fee which covers the cost to bring water and sewer service to every home and business; including meters, meter readers and billing; and
  Infrastructure Investment Fee which is allocated to the replacement/rehabilitation of system infrastructure.

The Customer Assistance Program (CAP) provides a credit for WSSC Water’s Ready-To-Serve-Charges on your water and sewer bills of up to $28 per quarterly bill or up to $112 per year. Customers who are enrolled in Maryland’s Office of Home Energy Programs (OHEP) qualify for this program. This program applies to renters when the tenant is the responsible billing party. For more information, please visit

To enroll, contact OHEP: 800-332-6347 or

Average Daily Consumption (ADC) 

The ADC is an average of your water consumption over the indicated time period. The ADC per person consumption is 55 gallons - or 165 gallons for a family of 3 people, which is a good baseline to compare your own household's ADC against.  Pay attention to the ADC on each bill, incremental increases could be signs of leakage, especially in toilet tanks. Learn more about water usage.

Meter Readings

Meter readings indicate how much water is being used in a time period. If your bill indicates the reading is an "estimate," contact the Call Center (301-206-4001) to have WSSC Water obtain an actual meter reading. Estimated billing only occurs when your meter cannot be read due to severe weather, an inoperable remote reader, or an inaccessible meter. Maryland State law requires WSSC Water to obtain an actual meter reading at least once every six months. When charges are estimated, unnoticed plumbing leaks could remain undetected, resulting in wasted water and increased charges once a reading is eventually done.

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