Residential properties are divided into 4 tiers. One fourth of the City’s total residential property is in each tier. Each tier is based on the impervious area for the property.
The impervious area for each property is calculated by using the Building Rooftop Footprint of the property multiplied by 1.5. The resulting answer is the property's total impervious area which is used to determine the Storm Water rate tier.
The Building Rooftop Footprint is based on your roof's sq footage as measured from GIS (Geographic Information System) images. The 1.5 multiplier takes into account any additional impervious area a property may contain like sidewalks, driveways, patios, etc. Example Residential Property
The example residence shown below has a 2,000 sq ft Building Rooftop Footprint. 2,000 multiplied by 1.5 equals 3,000 sq ft, which is the property's total impervious area. The property would be placed into Tier 2.
Detached buildings may also need to be included in a property's Building Rooftop Footprint. Typically, if the detached building is larger than 500 sq ft, it will need to be included.
If you have questions about how the Storm Water Department determined your property's Building Rooftop Footprint, you can watch the video near the top of this page for an answer, and learn how you can estimate your Building's Rooftop Footprint yourself.