Water Quality > Stormwater > Construction Stormwater General Permit

Construction Stormwater General Permit

• Permit (Effective January 1, 2011)
• Fact Sheet
• Focus Sheet
• Final Tier II Antidegradation Plan

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.

WAWebDMRs and PARIS

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

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