What is impervious surface and why is it used to set SWM Utility service charge rates?
Impervious surface is a hard surface, such as rooftops, sidewalks, and parking lots, which prevents the natural infiltration of rainwater into the ground. Pervious surfaces such as grass, trees, and other vegetation allow rainwater to infiltrate into the ground.

The more impervious surface area a property has, the more stormwater runoff it will generate. This increased stormwater runoff has a greater impact on the public drainage system. Therefore, higher SWM Utility service charges are appropriate so the county can manage the quantity and quality of that excess runoff.

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1. My property doesn’t flood and isn’t anywhere near a stream or river. Why do I have to pay this service charge?
2. How did the SWM service charge change in 2021?
3. What is the SWM Utility service charge used for?
4. How much revenue is generated by the SWM Utility service charge?
5. Why am I charged a Surface Water Management Utility service charge?
6. Can I get a service charge reduction?
7. Why has the service charge increased over the years?
8. How is the SWM Utility service charge determined and collected?
9. Who is responsible for paying the SWM Utility service charge?
10. How are the service charges calculated?
11. What is impervious surface and why is it used to set SWM Utility service charge rates?
12. Is the SWM Utility service charge deductible on my federal income tax?
13. What if I disagree with my SWM Utility service charge?
14. Where can I get more information?