Everything You Need to Know about the Mississippi SWPPP and NPDES Permit Requirements
- joeyruse
- Jan 30
- 3 min read
Navigating environmental compliance is essential for successful construction projects. In Mississippi, this involves adhering to the Mississippi Department of Environmental Quality (MDEQ) NPDES Construction General Permit (CGP) requirements and developing a comprehensive Stormwater Pollution Prevention Plan (SWPPP). This article highlights the SWPPP requirements, differentiates between small and large construction site permits, and outlines the steps for submitting a Notice of Intent (NOI) for permit coverage.
What is a Stormwater Pollution Prevention Plan (SWPPP)?
A SWPPP is a site-specific document that outlines strategies to control erosion, manage sediment, and minimize pollutants in stormwater runoff during construction. It is a key requirement for meeting both state and federal environmental regulations.
Who Needs a SWPPP in Mississippi?
Any construction activity that disturbs one acre or more of land must develop a SWPPP and obtain coverage under the MDEQ’s NPDES CGP. This includes projects that are part of a common plan of development that cumulatively disturb an acre or more. Projects under one acre of land disturbance are generally exempt from SWPPP and NPDES permitting requirements.
Large Construction Sites:
MDEQ breaks construction sites over one acre apart into two categories. Sites disturbing five (5) acres or more of land are classified as Large Construction Sites and are subject to more stringent regulations. This includes a requirement to file a formal Notice of Intent (NOI) with the MDEQ to obtain NPDES permit coverage before any soil disturbing activities can commence. A copy of the Notice of Coverage once obtained must be posted at the site entry.
Small Construction Sites:
Sites that disturb more than one acre, but less than five acres of land are considered Small Construction Sites. The requirements for these sites are generally less stringent. These type projects are still required to prepare a Small Construction Notice of Intent but are not required to formally file with the MDEQ. Operators must produce this NOI if requested by the MDEQ only. In lieu of formal permit coverage, Operators must post a Small Construction Site Notice at the site entry.
Key Components of a SWPPP
A compliant SWPPP in Mississippi must include the following elements:
Site Description:
Location and size of the project.
Description of construction activities.
Identification of nearby waterbodies and potential pollutant sources.
Soil types and erodibility factors.
Erosion and Sediment Controls:
Measures such as silt fences, sediment basins, and temporary seeding to prevent soil erosion and sediment discharge. These controls should be detailed in both narrative and map formats.
Good Housekeeping Practices:
Procedures for material storage, waste management, and spill prevention to ensure pollutants do not leave the site.
Inspections and Maintenance:
All controls and outfalls/discharge points are to be inspected after rain events that produce a discharge and at least weekly for a minimum of four inspections per month.
Maintenance schedules to ensure stormwater controls remain effective.
Record Keeping:
Documentation of all inspections, maintenance activities, and corrective actions to demonstrate compliance.
Steps for Submitting a NOI in Mississippi for Large Construction Sites:
Develop a SWPPP:
Prepare a plan that meets all MDEQ requirements.
Complete the NOI Form:
Provide owner/operator information, project details including location, anticipated start and completion dates, and receiving waterbody information.
Submit the NOI to MDEQ:
A NOI must be signed and submitted via mail-in hard copy. Electronic submissions are only allowed as a supplement to the mail-in copy to help expedite review timelines.
Of note – Small Construction Sites are required to prepare a Small Construction NOI, however, they are not required to formally submit unless requested by the MDEQ. A representative of the MDEQ will provide submittal procedures at that time.
Receive Permit Coverage:
Once the NOI is processed, MDEQ will issue a permit authorization.
Compliance and Enforcement
Failing to develop a SWPPP, obtain permit coverage, or adhere to NPDES requirements can result in penalties, project delays, and increased costs. The MDEQ conducts regular audits and inspections to ensure compliance and protect Mississippi’s water resources.
Final Thoughts
Meeting Mississippi’s SWPPP and NPDES requirements is essential for protecting water quality and avoiding regulatory complications. Whether your project is a small development or a large-scale construction site, adhering to these guidelines ensures compliance and minimizes environmental impact.
Not sure if you have everything you need? Contact the qualified stormwater compliance professionals at Eco Permit Pros today to check SWPPP off your to-do list!
Comments