Stormwater Management

Oak Brook NPDES

National Pollution Discharge Elimination System (NPDES) is a permit program to control water pollution by regulating point sources that discharge pollutants into waters of the United States.

Polluted stormwater runoff is commonly transported through municipal separate storm sewer systems (MS4s), and then often discharged, untreated, into local water bodies. An MS4 is a conveyance or system of conveyances that is:
  • owned by a state, city, town, village, or other public entity that discharges to waters of the U.S.,
  • designed or used to collect or convey stormwater (e.g., storm drains, pipes, ditches),
  • not a combined sewer, and
  • not part of a sewage treatment plant, or publicly owned treatment works (POTW).
To prevent harmful pollutants from being washed or dumped into specific types of MS4s, operators are required to obtain an NPDES permit and develop a storm water management program plan (SMPP). The Village of Oak Brook is an MS4 operator under the IEPA’s General Permit for Discharges.

  • A copy of the 2018 IEPA Notice of Intent can be found here.
  • Copies of the past five years of annual reports can be found here.
  • Village of Oak Brook Stormwater Management Program Plan: SMPP
  • The Stormwater Management Program Plan Executive Summary can be found here.
  • Village of Oak Brook Illicit Discharge Detection and Elimination Program.
  • A link to County information on stormwater pollution prevention can be found here.
  • A link to EPA information on stormwater pollution prevention can be found here.
  • A link to Illinois Flood Maps - DuPage County can be found here.

Report a Concern

Contact the Village of Oak Brook regarding problems with drainage features or illegal dumping into the storm sewer system. You can report anonymously here.

The Village of Oak Brook has partnered with DuPage County to implement illicit discharge monitoring activities. Additional information on identifying potential illicit discharges and contact information for reporting suspected illicit discharges can be reported by calling the Illicit Discharge Hotline at (630) 407-6896  or by email Suspected Illicit Discharge.  Citizens concerns can be found in the Citizens Guide to Monitoring Stormwater.

Climate change description and link


Climate change refers to any significant change in the measures of climate lasting for an extended period of time. Climate change includes major changes in temperature, precipitation, or wind patterns, among other effects, that occur over several decades or longer. As a requirement of the Village’s general NPDES Permit ILR40, consideration of impacts and effects of climate change on storm water, storm water controls, flood management and BMP implementation. A link to the EPA’s climate change website is located here.