Sand & Gravel General Permit

Current permit documents

• Sand & Gravel General Permit — expires March 31, 2026
  • 2021 Fact Sheet - Appendix A: Response to Comments
• Full Comments Received During Comment Period
• Small Business Economic Impact Assessment (SBEIA)

Historical permit documents

• 2018 Modified Sand & Gravel General Permit  — expired March 31, 2021
  • 2015 Fact sheet
    • Addendum A: 2015 draft permit response to comments 
    • Addendum B: Fact Sheet on the permit modified permit
    • Addendum C: Modified permit response to comments

Do I need a permit?

You may need a Sand and Gravel General Permit if your facility:

• Discharges process water, stormwater, or mine dewatering water into waters of the state.
• Is associated with sand and gravel operations, concrete batch plants, or asphalt batch plants.

You may need a portable operation permit if you move from site to site to:

• Crush rock
• Make concrete
• Make asphalt

Concrete Characterization Study

Concrete is widely used in construction because it is resilient, affordable, and easily available. At the end of their use, concrete structures and products are demolished into rubble (broken up pieces). This rubble can get stored, recycled and reused as building material. Once concrete has hardened into the durable material we commonly see, such as sidewalks or building foundations, it becomes an impervious surface, meaning rainwater runs off of it. However, when concrete is broken up into rubble and stored in piles waiting to be recycled, rainwater can flow through the piles.

Recently, we reviewed over 200 articles, reports, and papers published in the U.S. and internationally to help us understand what happens when rainwater interacts with concrete rubble and what potential pollutants might leach out into the water. The literature review found a list of potential pollutants associated with storing concrete rubble. However, none of the studies we reviewed had information on environmental impacts specific to concrete mixtures made in Washington. For more details, read our report: Recycled Concrete Aggregate Leachate: A Literature Review.

As a follow up to the literature review, we are studying 80 facilities to determine if Washington rainwater is picking up contaminants, and if so, to what degree. We are measuring pH, metals, and other properties of the water that could effect waterbodies and we will determine if permit updates are needed to better protect the environment.

For more information about this study, see our blog post about this project, and the Quality Assurance Project Plan containing a detailed explanation of the study's methods and procedures.

Information about past permit reissuance events, documents, presentations, and expired permits

• Historical permit information