The City of Columbia tracks water usage in Units of 100 cubic feet.
1 Unit = 100 cubic feet
100 cubic feet = 748.052 gallons
All customers are charged a flat fee for up to the first 3 Units (2244 gallons) of water use. This fee is based on meter connection size and location (see below). Customers are then charged for each additional Unit of water they use (see below for details). Rates became effective on July 1, 2021.