What is NPDES?
The NPDES Permit Program addresses water quality by regulating point and non-point sources that discharge regulated substances into waters of the United States. Created in 1972 by the Clean Water Act, the NPDES permit program is authorized to state governments by EPA to perform many permitting, administrative, and enforcement aspects of the program. The three significant categories of NPDES permit holders in this region include: 1) Municipal Wastewater; 2) Industrial Wastewater; and 3) Stormwater.
Stormwater NPDES permit holders develop stormwater management programs to manage polluted runoff (non-point source pollution) commonly transported via their stormwater systems. Typical methods of conveying stormwater runoff include storm drains, channels, ditches, pipes, etc. Stormwater NPDES permits regulate stormwater discharges via systems that are entirely separate from municipal sewer and/or wastewater systems.
To Learn more about Municipal and Industrial Wastewater go to NPDES Point Source Permits.
You can do your part. Prevent oils, solvents, fertilizers, herbicides and other harmful chemicals from being washed down storm drains.
Environmental Protection Agency
Idaho NPDES MS4 Stormwater (Non-Point Source Permit Holders)
Idaho Transportation Department – District 1 MS4
EPA Registry Id: 110043762167
600 W Prairie Avenue
Coeur d’Alene, ID 83815
Lakes Highway District MS4
EPA Registry Id: 110043762149
11341 N Ramsey Road
Hayden, ID 83835
Post Falls Highway District MS4
EPA Registry Id: 110043762130
East 5629 Seltice Way
Post Falls, ID 83854
Washington State Department of Ecology
Washington NPDES MS4 Stormwater (Non-Point Source Permit Holders)
City of Spokane Wastewater Management MS4
Permit: WAR04-6505
909 E Sprague Avenue
Spokane, WA 99202
Spokane County Stormwater Utility MS4
Permit: WAR04-6506
1026 W Broadway Avenue
Spokane, WA 99260
City of Spokane Valley Stormwater Utility MS4
Permit: WAR04-6507
11707 E Sprague Avenue
Spokane Valley, WA 99206
WSDOT MS4
Permit: WAR04-3000
310 Maple Park Avenue SE
Olympia, WA 98501
Washington State University Extension – Spokane MS4
Permit: WAR04-6701
412 E Spokane Falls Boulevard
Spokane, WA 99202