What is impervious surface?
“Impervious surface” as defined as any hard-surfaced area that prevents or retards the entry of water into the soil. This causes water to run off the surface in greater quantities or at an increased rate of flow than was present under natural conditions such as roof tops, asphalt or concrete sidewalks, paving, driveways, parking lots, walkways, patio areas, storage areas, gravel, bituminous substances, or other surfaces which similarly affect the natural infiltration or runoff patterns of land property in its natural state.

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1. What is stormwater runoff?
2. Why are the stormwater and sanitary systems separate?
3. What is non-point source pollution?
4. What can residents do to help improve stormwater quality?
5. What is impervious surface?
6. What is a MS4?
7. What is an illicit discharge?