What is the National Pollutant Discharge Elimination System (NPDES) Stormwater Program?
Mandated by Congress under the Clean Water Act, the NPDES Stormwater Program is a comprehensive 2-phased national program for addressing the non-agricultural sources of stormwater discharges that adversely affect the quality of our nation's waters.

The Clean Water Act prohibits anybody from discharging "pollutants" through a "point source" into a "water of the United States" unless they have an NPDES permit. The program uses the NPDES permitting mechanism to require the implementation of controls designed to prevent harmful pollutants found in stormwater runoff from washing into local water bodies. The permit contains limits on what you can discharge, monitoring and reporting requirements, and other provisions to ensure that the discharge does not hurt water quality or people's health.

In essence, the permit translates general requirements of the Clean Water Act into specific provisions tailored to the operations of each person discharging pollutants. In Washington, the Washington State Department of Ecology administers the NPDES program.

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1. What is the National Pollutant Discharge Elimination System (NPDES) Stormwater Program?
2. What is a Municipal Separate Storm Sewer System (MS4)?
3. Which Municipal Separate Storm Sewer Systems are regulated by the Eastern Washington Phase II Municipal Stormwater Permit?
4. How are the regional stormwater utility service areas determined?
5. What is stormwater and why is it a problem?
6. What is an impervious surface?
7. How will the stormwater management program benefit taxpayers, homeowners, etc.?
8. What kinds of pollutants are found in the storm drain system?
9. Are sewers and storm drains the same thing?
10. What can residents do to help improve stormwater quality?
11. What can you put down the storm drain?
12. What happens if the Regional Stormwater group does not comply with its NPDES stormwater discharge permit?
13. What is meant by a "larger common plan of development or sale?"
14. What kinds of stormwater discharges are required to have NPDES stormwater permit coverage?
15. What is the stormwater fee used for?
16. How is the stormwater fee calculated?
17. Is the utility fee just another tax?
18. Why a stormwater utility now?
19. No water runs off my property. Why am I being charged a stormwater fee?