Skip to content
February 20, 2024
Sampling Stormwater from a Catch Basin
February 13, 2024
Sampling Stormwater from an Outlet Pipe
Elements of the Permit
Assess Your Site
There are several things that need to be considered prior to and during your application for a permit. You will need to conduct quite a lot of research prior to completing the Notice of Intent (NOI) and the Stormwater Pollution Prevention Plan (SWPPP) for your site.
Apply for Coverage
After assessing your site, you need to begin the application process in the form of an electronic Notice of Intent (eNOI).
Make a Plan
Your Stormwater Pollution Prevention Plan (SWPPP) describes what you are doing, how you will do it, and what BMPs you are going to implement to maintain permit compliance at all your discharge points. Each permitted project must submit a Stormwater Pollution Prevention Plan (SWPPP); outlined in Section S3 of the ISGP.
Monitoring Your Site
After you attain coverage under the ISGP, it is required that your site is actively monitored to ensure the SWPPP is being followed and compliance with the permit is being achieved.
Identifying what sample parameters your site is required to monitor, finding a laboratory that can analyze your samples, and using proper sampling techniques are all critical elements of an effective stormwater management program at a facility.
The ISGP has identified those BMPs that are required on all sites as a minimum but also provides lists and guidance for all other BMPs categorically so that you can select and apply them as needed in response to monitoring that identifies exceedance of permit benchmarks.
Facilities whose quarterly sampling results exceed benchmarks are required to go through the corrective action process. Corrective actions are strategies that facilities must implement to reduce pollutants in their stormwater discharge and bring their samples below the benchmark values.
Reporting & Recordkeeping
Every permitted industrial site has a significant amount of paperwork to manage. Some of the paperwork is completed and remains on site as part of the internal record-keeping procedure.
These factors can include site-specific issues, the use of best management practices, and the involvement of stakeholders. Understanding and addressing these additional considerations can help ensure successful compliance with the permit and protect Washington’s water resources.
The State Environmental Policy Act (SEPA) is a state law in Washington that requires state and local agencies to consider the potential environmental impacts of proposed projects before making decisions. This process is required for most sites requiring stormwater permit coverage.