Water base charges are a flat monthly fee that covers fixed costs of providing services that do not change with water usage. These are items such as management, administration, customer service and the cost of our operations employers. Water usage is billed based on actual use per thousand gallons that goes through the meter monthly. This volume is read each month from the meter. The sanitary sewer charges are fees used to pay for wastewater treatment through the Lone Tree Creek Water Reclamation Facility.