Construction Stormwater General Permit

Stormwater runoff from construction sites can carry muddy water, debris, and chemicals into local waterways. Sediments, chemicals, and debris can harm aquatic life and reduce water quality.

We require regulated construction sites to get coverage under the Construction Stormwater General Permit. Following the requirements in this permit helps control and reduce water pollution.

Operators of regulated construction sites are required to:

  • Develop stormwater pollution-prevention plans.
  • Implement sediment, erosion, and pollution-prevention control measures.
  • Obtain coverage under this permit.

The current permit went into effect Jan. 1, 2021, and expires Dec. 31, 2025.

To receive updates about this permit, sign up for our email list.

Permit reissuance

We invited comments on the draft permit document from March 19 until May 9, 2025. We will publish a Response to Comments as an appendix to the fact sheet to address comments submitted during the public comment period. You can view the comments we recieved on our online comments site.

Supporting documents

Timeline

Spring 2024 - Winter 2025: Gather early input and begin redevelopment
March 19 - May 9, 2025: Formal public comment period on the draft permit
November 2025: Decision on permit issuance
Dec. 31, 2025: Current permit expires

Applications and forms

I've got permit coverage. Now what?

Check out our eCoverage packet for more information about your requirements.

If you would like more information on the permit fee process, visit Water Quality permit fees webpage.

Need help implementing the permit?

What do I do with contaminated water?

See contaminated water on construction sites for guidance.