DEEP: Stormwater Management

Stormwater Management

What is Stormwater?
Stormwater is water resulting from rain or snowmelt that runs off surfaces such as rooftops, paved streets, highways and parking lots. Along the way, the water may pick up and transport contaminants including motor oils, gasoline, antifreeze, and brake dust (commonly found on pavements), fertilizers and pesticides (found on landscaped areas), and soil sediments (from farms and construction sites). The water eventually flows into a local stream, river or lake, or into a storm drain and continues through storm pipes until it is released untreated into a local waterbody.

Stormwater results in significant pollution to surface water affecting primary contact recreation such as swimming and aquatic life use support.

DEEP is working to engage stakeholders to prevent the introduction of pollutants into stormwater through its Non Point Source Pollution Management and Coastal Nonpoint Source Pollution Control Programs.

How is Stormwater Regulated?
The Environmental Protection Agency (EPA) has mandated a number of permit programs, administered by the Department of Energy and Environmental Protection (DEEP), to deal with stormwater pollution.

  1. The General Permit for the Discharge of Stormwater Associated with Industrial Activity (“Industrial General Permit”) regulates industrial facilities with point source discharges that are engaged in specific activities listed in the permit.  To register for this program, these facilities must submit a registration form, and implement a Pollution Prevention Plan (PPP).  The PPP must include information about the site, an inventory of exposed materials, a summary of potential pollutants, a description of and schedule for implementation of storm water control methods, storm water monitoring, and site inspection.

The Industrial General Permit became effective on October 1, 2011 and was modified on December 3, 2013.  The modification is limited to Sections 5(b)(12) and 5(f)(7)(D)(ii) and Appendix B of the Industrial General Permit and pertains only to bulk solid de-icing material storage facilities with the capacity to store 30,000 tons or more of solid de-icing materials at any one time.

Registration forms and additional information for the permit are available below:

a.  General Permit ,  effective October 1, 2011, modified December 3, 2013 
Check the Status of your Registration/Certification
How To Register
       Stormwater Monitoring Report Forms:
Use the appropriate form, from the list below, to submit stormwater monitoring data to the department. Refer to Section 5(e) of the general permit with modifications for specific information on monitoring requirements.
Note: The monitoring forms below dated 9/1/11 have been revised to correct an error in the Sector H form and to include updated certification language (new revision date: 10/17/11).
Types of Facilities
Revision Date 10/17/11
General (for facilities without sector-specific requirements) Word , PDF
Sector A - Asphalt Plants Word , PDF
Sector B - Mines & Quarries and Stone Cutting Word , PDF
Sector C - Refuse Systems Word , PDF
Sector D - Auto Salvage Yards Word , PDF
Sector E - Scrap Recycling Facilities Word , PDF
Sector F - Steam Electric Power Generation Word , PDF
Sector G - Transportation and Public Works Facilities
  • (Non-Municipal) Transportation Facilities ( SIC Codes 40, 41, 42, 43, 44 - except 4493 and 45) ( use the general form )
Word , PDF
  • Large Airports
Word , PDF
  • Small Airports
Word , PDF
  • Federal, State or Municipal Maintenance/Repair/Salt Storage Facilities
  • Bulk Solid De-icing Material Storage Facilities
  • DOT Maintenance and Repair Facilities
Word , PDF
Sector H - Marinas, Yacht Clubs, Boat Dealers Word , PDF
Sector I - Ship & Boat Building and Repair Word , PDF
Sector J - Small Scale Composting Facilities Word , PDF
  1. The General Permit for the Discharge of Stormwater and Dewatering Wastewaters from Construction Activities  ("Construction General Permit")  requires developers and builders to implement a Stormwater Pollution Control Plan to prevent the movement of sediments off construction sites into nearby water bodies and to address the impacts of stormwater discharges from a project after construction is complete.  The Construction General Permit reissued without modifications on October 1, 2012 expires on September 30, 2013.  On August 21, 2013, the Department reissued the Construction General Permit with modifications.  This general permit becomes effective on October 1, 2013. The modified Construction General Permit, guidance documents, registration forms and instructions may be accessed through the links below. 
Note:  Existing projects are required to register for coverage under the modified Construction General Permit on or before February 1, 2014.
Posting of Registrations for the Construction Stormwater General Permit
Registrations received on or before:
To request or comment on a registration or Pollution Control Plan, submit a written request/ comment to Neal Williams ( ). A request/comment must include your name, contact information, and the project’s Application Number.
  1. The Stormwater Associated with Commercial Activity General Permit , found only in Connecticut, requires operators of large paved commercial sites such as malls, movie theaters, and supermarkets to undertake actions such as parking lot sweeping and catch basin cleaning to keep stormwater clean before it reaches water bodies.
          requires each municipality to take steps to keep the stormwater entering its storm sewer systems
          clean before entering water bodies. One important element of this permit is the requirement that
          towns implement public education programs to make residents aware that stormwater pollutants
          emanate from many of their everyday living activities, and to inform them of steps they can take
          to reduce pollutants in stormwater runoff.
Related Guidance 
Related Information
Content Last Updated December 2014