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Louisiana Stormwater

Louisiana State Overview

The state of Louisiana and the Louisiana Department of Environmental Quality (LDEQ) became a state delegated to administer the NPDES Program in August of 1996. Louisiana's Water Quality Regulations mandate permits for the discharge of pollutants from any point source into waters of the State of Louisiana. This surface water discharge permitting system is administered under the Louisiana Pollutant Discharge Elimination System (LPDES) Permitting Program. 

The LPDES General Permit for Large and Small Construction Activities authorizes the discharge of stormwater is comprised of two separate permits:

  • CGP for Large Construction Activities: "Large Construction Activities" are classified as project sites where land disturbing activities will be taking place on more than five (5) acres."
  • CGP for Small Construction Activities:  "Small Construction Activities" are classified as project sites where land disturbing activities will be taking place on more than one (1) acre, but less than five (5) acres.

Stormwater discharges from construction activities can only be authorized under a Louisiana Pollutant Discharge Elimination System (LPDES) General Permit if the project site owner or operator: (1) develops a Storm Water Pollution Prevention Plan covering either the entire site or all portions of the site for which they are operators; and (2) submits a complete and accurate Notice of Intent (NOI) using the NOI form provided by the State Administrative Authority.

The state of Louisiana and the Louisiana Department of Environmental Quality (LDEQ) became a state delegated to administer the NPDES Program in August of 1996. Louisiana's Water Quality Regulations mandate permits for the discharge of pollutants from any point source into waters of the State of Louisiana. This surface water discharge permitting system is administered under the Louisiana Pollutant Discharge Elimination System (LPDES) Permitting Program. 

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Louisiana Storm Water Pollution Prevention Plan Requirements

As per the requirements of coverage under the Louisiana Construction General Permit (CGP), at least one Storm Water Pollution Prevention Plan (SWPPP) must be developed for each construction project. Owners and operators have the option to create separate Storm Water Pollution Prevention Plans (SWPPPs), or to participate in one comprehensive plan covering the entire project site. Storm Water Pollution Prevention Plans (SWPPPs) must identify all potential sources of pollution which may be expected to affect the quality of stormwater discharges from a construction site. In order to prevent any non-compliance throughout the construction project duration, the SWPPP is required to include the following:

(1)   The SWPPP must be signed by the appropriate person in charge of the construction project, such as the owner, operator or person of equivalent authority. All signatures must be written in compliance with the standards of the Louisiana Construction General Permit (CGP).

(2)   Each SWPPP must include a site description indicating the nature of construction activity, the intended sequence of major land disturbing activities, estimates of the total land area to be disturbed, and an estimate for pre and post construction runoff.

(3)   In addition to the site description, a detailed site map outlining the location of major land disturbing activities, points of discharge produced by the construction activity, all drainage areas and receiving waters both on and near the site, and Best Management Practices (BMPs) and other control used to contain and prevent any unauthorized stormwater discharges or other forms of non-compliance. 

(4)   A description of construction and waste materials that will be stored on site should be included.

(5)   All Best Management Practices and other control measures that will be used throughout the project duration must be clearly described and include an estimate of general timing for implementation and use. 

Note: If conducting construction activities in areas where the Louisiana Department of Environmental Quality (LDEQ) has an established Total Maximum Daily Load (TMDL) for stormwater runoff and other associated waste discharges, the SWPPP must state how each Best Management Practice (BMP) will ensure that all site discharges will remain in compliance with the authorized TDML.

(6)   The SWPPP should outline all inspection schedules and associated maintenance plans that will occur throughout the project.

(7)   The SWPPP must include a description of all interim and permanent stabilization methods for the site, including site-specific locations and scheduling of implementation. The dates of major land disturbing activities, the dates when construction temporarily and permanently ceased, and the dates of stabilization initiation should be documented in this section of the SWPPP.

All Storm Water Pollution Prevention Plans (SWPPPs) are required to be kept up-to-date. If there is a change in design, construction, operation, or maintenance, which has a significant impact on site discharges, the SWPPP should be modified accordingly. All modifications to the SWPPP must be made within fourteen (14) days of knowledge of a change. The SWPPP is also required to be kept on the construction site and easily accessible upon request until the project has permanently ceased and a Notice of Termination has been accepted. 

Due to high erosion rates, construction sites are by far the largest source of sediment that pollutes water resources of the United States. ,
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