Industrial Stormwater Permit Guide

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Lesson 2: Permitting Options and Requirements

EPA's MSGP and comparable state industrial stormwater general permits typically require you to develop a SWPPP prior to obtaining permit coverage. The contents of the SWPPP must be consistent with the MSGP permit conditions for SWPPPs, which require you to:

  • Identify all potential sources of pollution that may reasonably be expected to affect the quality of stormwater discharges from your facility;
  • Describe practices you will install and implement to eliminate or reduce all pollutants in stormwater discharges from the facility, including;
    • Collection and pre-treatment systems
      • Infiltration devices which capture and retain a portion of runoff on- site and allow it to infiltrate into the soil, and in the case of surface basins, evaporate into the air.
      • Sand filters which are used to filter pollutants from runoff from large buildings, access roads and parking lots.
      • Oil and grease trap catch basins which are underground devices that remove oil, grease, litter and coarse sediments from runoff.
    • Vegetative plantings - Filter strips and grassy swales are vegetative practices that act as nature's biofilters to reduce stormwater flows and pollution.
    • Detention/retention, settling, percolation, evaporation, evapotranspiration, filtration, absorption and biological uptake to reduce flows and remove pollutants. Examples include dry detention basins, wet retention ponds, and artificial wetlands.
    • Covers for materials stored outside, such as road salt or coal piles, to prevent exposure to rainfall or runoff.

The MSGP and other state-issued industrial stormwater general permits typically require SWPPPs to include additional information that is useful to both you and the permitting authority to describe other relevant facility operations and the natural resources that you are trying to protect. These additional requirements may require your SWPPP to describe:

  • Staff that comprise the facility's stormwater pollution prevention team
  • Site characteristics, including the nature of industrial activities, percent of site impervious surface estimate, average annual precipitation, location map, and detailed site map
  • Surface waters, wetlands or other aquatic sites that receive discharges from your facility
  • Spill control and response plans
  • Inspection and sampling procedures
  • Maintenance procedures
  • Any additional measures needed to protect endangered species, critical habitat, and historic properties.
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