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Water Quality Program

Construction Stormwater General Permit

Construction site operators are required to be covered by a Construction Stormwater General Permit if they are engaged in clearing, grading, and excavating activities that disturb one or more acres and discharge stormwater to surface waters of the state. Smaller sites may also require coverage if they are part of a larger common plan of development that will ultimately disturb one acre or more. Operators of regulated construction sites are required to:

  1. Develop stormwater pollution prevention plans.
  2. Implement sediment, erosion, and pollution prevention control measures.
  3. Obtain coverage under this permit.

Ecology will revise and reissue the Construction Stormwater General Permit in 2015
The current Construction Stormwater General Permit (CSWGP) will expire December 31, 2015. Current permit holders (Permittees) must reapply for permit coverage by July 3, 2015. Ecology will mail reapplication instructions to all existing Permittees in April 2015. Ecology plans to issue the new CSWGP in December 2015 with an effective date of January 1, 2016.

Ecology held four (4) Listening Sessions as a forum for interested parties to provide informal feedback on the current CSWGP as well as feedback on the proposed changes to the CSWGP.

The following schedule will be updated and modified as necessary to reflect current status.




Public Listening Sessions

October 8, 2014
1 pm
Mt. Vernon Listening Session

Skagit Transit Station
105 E. Kincaid St.
Mt. Vernon, WA 98273

October 16, 2014
1 pm
Pierce County Listening Session

Pierce County Environmental Services Building
9850 64th Street W.
University Place, WA 98467

October 21, 2014
1 pm
Vancouver Listening Session

Water Resources Education Center
4600 SE Columbia Way
Vancouver, WA 98661

October 30, 2014
10 am
Statewide Listening Session

Telephone and internet based conference available statewide.

Mail reapplication instructions to existing Permittees to reapply for permit coverage

April 2015

Renewal application due date July 3, 2015 (180 days prior to expiration). Internet based application.

Publish Draft Permit and Fact Sheet

July 1, 2015

Begin Public Comment Period for Draft CSWGP.
~40 days

Public Workshops & Hearings

July 2015

Locations To Be Determined.

Permit Reapplications Due

July 3, 2015

Due 180 days prior to expiration of permit.

Close Public Comment Period

August 10, 2015

Public Comments must be postmarked or emailed by midnight.

Issue Final Permit

December 2, 2015

Copies mailed to all permit holders.

Final Permit Effective

January 1, 2016

Old permit expires, new permit is effective.

Questions? Contact Amy Moon at 360/407-6467 or amy.moon@ecy.wa.gov.


Contact Us - Contact your Permit Administrator for permit assistance or your Regional Office for site specific questions.

Permit, Forms and Application - Permit, application, forms, and appeal information.

High Turbidity Reporting - Construction projects must report high stormwater turbidity results within 24 hours. If you get a high result, call your Ecology regional office.

Resources and Guidance - DMRs, Stormwater monitoring, manuals, 303(d) list information.

CESCL Training and Certification Programs

CESCL Database

Historical Information - Pollution Control Hearing Board information, public comments.

Get Ecology updates about the Construction Stormwater General Permit - Sign up for the Construction Stormwater General Permit email list



New item

Erosivity Waiver Calculator

Construction Stormwater Site Inspection Form

Online Application (eNOI) Now Available

Sampling Frequently Asked Questions

Construction Stormwater General Permit Application Status - Check the status of your application.

Stormwater Pollution Prevention Plan Template - To use this template, save to your computer.

Sign up for the Construction Stormwater General Permit email list