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Impervious Surface

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Impervious surface is... Connection to the Stormwater Fee

Impervious surface is...

Hard surface on a property that does not allow rain to soak into the ground. 

Roofs Residential/Commercial buildings
Garages and carports Patios ​(concrete, pavers, gravel, etc.)
Storage sheds Driveways, sidewalks, and parking lots
Artificial Turf Typical slatted decks

Find Your Property's Impervious Surface

Use this 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.

Connection to the Stormwater Fee

We base the stormwater rate you pay 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.