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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.

The current Construction Stormwater General Permit (CSWGP) will expire December 31, 2015. Ecology plans to issue the new CSWGP in November 2015 with an effective date of January 1, 2016. All Permittees must reapply per Section G8 of the current permit. Reapplication Instructions and Information

Proposed Permit Documents

Current Permit Documents

Public Comment Period July 1 - August 10, 2015

Ecology will consider all public comments before issuing the final CSWGP in December 2015, with an effective date of January 1, 2016. The public comment period is now closed.

Ecology hosted six public workshops in Vancouver, Mount Vernon, Moses Lake, Seattle, University Place, and as a Webinar to explain proposed changes to the CSWGP and answer questions. A public hearing was held at University Place in Pierce County, to allow interested parties to provide oral testimony on the draft CSWGP. Workshop slides




Mailed reapplication instructions to existing Permittees

April 2015

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

Published Draft Permit and Fact Sheet

July 1, 2015

Begin Public Comment Period for Draft CSWGP. ~40 days

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

November 18, 2015

Copies mailed to all permit holders.

Final Permit Effective

January 1, 2016

Old permit expires, new permit is effective.

Note: dates/locations subject to change.


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.

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 listserv


It’s Time to Reapply
All Permittees must reapply by July 3, 2015. Permittees can now reapply online.

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