I was informed that my bill is based on my property's "impervious surface," what is an "impervious surface?"
It is the area on a property that is covered by buildings, driveways, parking areas, and other hard surfaces (concrete, gravel asphalt, roof-tops) that prevent storm water runoff from being absorbed into the ground. Consequently, storm water runoff picks up pollutants deposited on these impervious surfaces, such as oil, gasoline, pesticides, fertilizers, and other chemicals and carries them to our waterways.

In addition, as runoff travels over impervious surfaces, it gains speed and erodes soil near or in the waterways, adding another pollutant called sediment.

Show All Answers

1. Why do we pay a monthly storm water fee?
2. I don't have storm sewers serving my property, why am I being charged this fee?
3. I was informed that my bill is based on my property's "impervious surface," what is an "impervious surface?"