Everything You Need to Know about the Illinois SWPPP and NPDES Permit Requirements
- joeyruse
- Jan 30
- 3 min read
With increasing environmental concerns and strict regulations, it’s crucial for operators in Illinois to stay informed about compliance requirements. This includes adhering to the Illinois Environmental Protection Agency (IEPA) General NPDES Permit for Stormwater Discharges from Construction Site Activities (ILR10) and developing a comprehensive Stormwater Pollution Prevention Plan (SWPPP). This article provides an overview of SWPPP requirements, ILR10 compliance, and the process for submitting a Notice of Intent (NOI) with the IEPA for stormwater permit coverage.
What is a Stormwater Pollution Prevention Plan (SWPPP)?
A SWPPP is a site-specific document designed to minimize the impact of construction and industrial activities on local water bodies. The SWPPP outlines strategies and practices to prevent pollutants, such as sediment, chemicals, and debris, from contaminating stormwater runoff. By addressing erosion control, sediment management, and good housekeeping practices, the SWPPP helps ensure compliance with state and federal stormwater regulations.
Who Needs a SWPPP in Illinois?
In Illinois, any construction activity disturbing one acre or more of land must develop a SWPPP as part of obtaining coverage under the ILR10 General Permit. This also applies to smaller projects that are part of a larger common plan of development that cumulatively disturbs an acre or more. For projects disturbing less than one acre and not part of a larger development, a SWPPP and permit coverage are typically not required.
Key Components of a SWPPP
A compliant SWPPP in Illinois must include the following elements:
1. Site Description
Location and size of the project.
Description of construction activities.
Identification of potential pollutant sources expected to be kept onsite.
2. Erosion and Sediment Controls
Detailed measures to prevent soil erosion and sediment discharge, such as silt fences, sediment traps, sediment basins, and stabilized entrances/exits.
Inclusion of these measures in narrative form and on a site map.
3. Good Housekeeping Practices
Procedures for proper waste management, material storage, and spill prevention.
Plans for managing hazardous materials and chemicals to prevent contamination of stormwater.
4. Inspections and Maintenance
Regular inspections of the site to ensure stormwater controls are effective.
Site-specific inspection frequency based on the ILR10 permit requirements including inspections after every rainfall event of 0.5 inches or more and at least once every seven calendar days.
Maintenance schedules for stormwater controls to address any deficiencies promptly.
5. Record Keeping
Documentation of inspections, maintenance activities, and corrective actions taken.
Records must be retained for at least three years after the project’s completion.
ILR10 General Permit Requirements
The ILR10 General Permit, issued by the IEPA, governs stormwater discharges associated with construction activities. To comply with the ILR10 permit, operators must:
Develop a SWPPP prior to the start of construction.
Submit a Notice of Intent (NOI) using the EPA’s CDX portal to request permit coverage.
Implement the SWPPP throughout the construction project.
Conduct regular site inspections and maintain proper records.
Submit a Notice of Termination (NOT) once construction is complete and final stabilization is achieved.
Understanding the Notice of Intent (NOI)
The NOI is a formal application submitted to the IEPA to obtain coverage under the ILR10 General Permit. Here’s how the process works:
1. Completing the NOI Form
Provide details about the project, including its location, size, start and end dates, and operator information.
Certify that the SWPPP has been developed and will be implemented.
Obtain a certification letter from the IL Department of Natural Resources (DNR) EcoCat portal stating there are not Endangered Species or Critical habitats located in the project area.
Obtain authorization from the IL State Historic Preservation Office stating there are no historical properties listed or active within the project area.
2. Submitting the NOI
NOIs can be submitted electronically through the US EPA’s CDX e-Permitting Portal in conjunction with the IL EPA.
3. Paying the Required Fee
Submit the required fee of $750 for NOI processing.
4. Receiving Confirmation of Coverage
Once the NOI is processed and approved, the IEPA will issue a confirmation of coverage under the ILR10 permit. This typically takes about 7–10 business days.
Compliance and Enforcement
Failing to develop a SWPPP, submit an NOI, or comply with the ILR10 permit requirements can lead to significant penalties, including fines, project delays, and reputational damage. The IEPA conducts regular audits and inspections to ensure compliance, making it essential for operators to stay up to date on permit requirements and maintain accurate records.
Final Thoughts
Ensuring compliance with SWPPP and ILR10 requirements is critical for protecting Illinois’s water resources and avoiding costly enforcement actions. By preparing a thorough SWPPP, submitting the required NOI, and maintaining compliance throughout the project lifecycle, operators can keep their projects on track while safeguarding the environment.
Need help with SWPPP development or permit applications?
Contact the stormwater compliance experts at Eco Permit Pros to ensure your project meets all IEPA requirements and stays in compliance every step of the way!
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