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Stormwater Quality

Stormwater Quality

Stormwater Quality Group

The Stormwater Quality Group is responsible for administering the municipal separate storm sewer system (MS4) program and implement measures to keep pollution out of our stormwater through education, inspection, and enforcement activities.

Stormwater from rain and snowmelt events is transported to local creeks and streams via the MS4.  As it travels from your roof, driveway, or neighborhood street to the MS4, stormwater can encounter and transport pollutants.  Common pollutants include oil and grease from vehicles, pesticides and fertilizers from lawns, sediment from construction sites, and trash like cigarette butts, plastic bottles, paper wrappers, and Styrofoam cups.  Any pollutants carried by stormwater are discharged directly to waterbodies because the stormwater is not treated before it is discharged from the MS4.

Polluted stormwater runoff is a leading source of contamination of waterbodies nationwide and can lead to water quality impairments that limit their use for recreation, as a source for drinking water, and as habitat for fish and other aquatic organisms.  Because of this, the Clean Water Act was amended in 1987 to address stormwater runoff.  Regulations under Phase II of the National Pollutant Discharge Elimination System (NPDES) Stormwater Program were issued on December 8, 1999, and require that medium to small sized cities and towns take steps to reduce the amount of pollution in the stormwater discharged from their MS4.

The City of Norman is subject to these regulations and obtained a permit for stormwater discharges from its MS4 from the Oklahoma Department of Environmental Quality (OPDES Permit No. OKR040015).  As part of this permit, the City is required to develop and implement a stormwater management program .  The permit outlines six minimum control measures that the City must address in its stormwater management program:

1. Public Education and Outreach

  • Educational materials and events are used to inform citizens about the impact of polluted stormwater runoff on water quality.

2. Public Participation and Involvement

  • Provide opportunities for citizens to participate in the development and implementation of the program.
  • Stormwater Management Program
  • If you have questions, comments, or suggestions for our staff, please email us at

3. Illicit Discharge Detection and Elimination
Detecting and eliminating illegal discharges to the MS4 is an important way to prevent anything but rain from entering the storm drains.
An illicit discharge can include oil, paint, grass clippings, lawn chemicals, pet waste, commercial or industrial wastewater, or trash.

Check out this YouTube video to learn more:

If you think you saw an illicit discharge, contact us at or report it to the Action Center.

4. Construction Site Runoff Control

  • Development and implementation of a program to control erosion from construction sites.
  • Engineering Design Criteria
  • BMP Manual
  • Earth Change Permit Application
  • Water Quality Protection Zone Ordinance

5. Post-Construction Runoff Control

  • Development and Implementation of best management practices to control stormwater discharges from sites after construction is complete.
  • The City of Norman has implemented a Manufactured Fertilizer Ordinance to preserve and protect waterbodies within city limits by limiting the use of phosphorus-containing fertilizer and establishes rules for the application of all fertilizers.

i.    Manufactured Fertilizer Ordinance
ii.    Commercial Fertilizer Applicator Registration Form
iii.    Fertilizer Ordinance Brochure

  • GI/LID Links

6. Pollution Prevention/Good Housekeeping

  • Prevent or reduce pollutant runoff from municipal operations.