Impervious Area Charge

Impervious surfaces such as rooftops, paved driveways, patios, and parking lots are major contributors to stormwater runoff entering the District's combined sewer system. This adds significantly to pollution in the Anacostia and Potomac Rivers and Rock Creek.

The Clean Rivers Impervious Area Charge (CRIAC) is a fair way to distribute the cost of maintaining storm sewers and protecting area waterways because it is based on a property's contribution of rainwater to the District's sewer system. Because charges are based on the amount of impervious area on a property, owners of large office buildings, shopping centers and parking lots will be charged more than owners of modest residential dwellings.

All residential, multi-family and non-residential customers are billed a CRIAC. The charge is based on an Equivalent Residential Unit (ERU). An ERU is a statistical median of the amount of impervious surface area in a single-family residential property, measured in square feet. The approved monthly ERU values for FY 2017 and FY 2018 are $22.24 and $25.18 respectively.

For more information about the history of the CRIAC and the project it funds, please read the detailed "Clean Rivers and Impervious Cover" blog post by our CEO and General Manager Geeorge Hawkins.

Map highlighting impervious surface areas:
driveways, private walks, roof tops, and parking lots