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Impervious Surface

What you need to know

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Overview Find Your Property's Impervious Surface Stormwater Utility Fee


Impervious surface is a hard surface on a property that does not allow rain to soak into the ground. 

RoofsResidential/Commercial buildings
Garages and carportsPatios ​(concrete, pavers, gravel, etc.)
Storage shedsDriveways, sidewalks, and parking lots
Artificial TurfTypical slatted decks

Find Your Property's Impervious Surface

Use the Impervious Surface Map to see your property's impervious surface area.

Note: For residential permitting purposes, a survey or plot plan showing existing and proposed impervious surface calculations as line items may be required.

Stormwater Utility Fee

We base the stormwater utility fee on the amount of impervious surface on your property.

Here’s why:

  1. Since impervious surface doesn't allow rain to soak in the ground, we need to manage where that water goes and how it flows. 
  2. The more impervious surface, the more we have to manage stormwater.

The stormwater fee helps us maintain and improve the stormwater system. The system safely carries water through streets and yards to storm drains and streams.