What does impervious mean?

Impervious is a term used to describe a surface that does not absorb runoff. Examples of impervious surfaces include roofs of buildings and asphalt or concrete (such as driveways or parking lots). Governments typically use the amount of impervious surface on each property as the basis for the fee calculations because it is the most accurate, readily available indicator of the impact each property has on the stormwater system. 

Show All Answers

1. What is a stormwater fee? What does this fee cover?
2. Why do I pay a stormwater fee?
3. How is the fee calculated?
4. How do I appeal the amount of my fee? What if I think there is an error in my bill?
5. What is stormwater?
6. What does impervious mean?
7. How does the City know the amount of impervious surfaces on each parcel?
8. How long does the appeal process take?
9. What is the City doing to minimize the impact of stormwater?