How is the amount of impervious area on my property calculated?

The amount of impervious area on your property is determined through the use of a geographic information system (GIS), aerial photos, and satellite imagery. Images are taken of Durham that show the impervious surfaces on each property. A computer program is then used to calculate the amount of impervious area on each parcel. To view impervious area on your property visit the Stormwater Utility Fee Map.

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1. Why is impervious area used to determine a property's stormwater utility fee?
2. What is considered an impervious surface?
3. How is the amount of impervious area on my property calculated?
4. What if I disagree with the amount of impervious area listed on my bill?
5. Why are there tiers for the residential stormwater utility fees?
6. What are the tiers?