What kinds of stormwater discharges are required to have NPDES stormwater permit coverage?
The NPDES stormwater permit regulations cover the following classes of stormwater discharges:
- Operators of Municipal Separate Storm Sewer Systems (MS4s) located in local Urban Growth Areas and "urbanized areas" as delineated by the Bureau of the Census.
- Industrial facilities in any of the 11 categories that discharge to an MS4 or to waters of the United States; all categories of industrial activity (except construction) may certify to a condition of "no exposure" if their industrial materials and operations are not exposed to stormwater, thus eliminating the need to obtain stormwater permit coverage.
- Operators of construction activity that disturbs 1 or more acres of land; construction sites less than 1 acre are covered if part of a larger plan of development.
- Sand and gravel operators.

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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?