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Stormwater Division

Have questions about stormwater quality or maintenance concerns?

Contact us: pwstormwater@normanok.gov


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About Us

The Stormwater Division is responsible for the protection of the health, safety, and welfare of the people of Norman by the regulation of non-stormwater discharges to the City’s municipal separate storm sewer system (MS4) as well as the management, maintenance, and improvement of this system.  


The MS4 consists of a series of underground pipes, open channels, ditches, and roadways used to collect or convey stormwater.  Water and other materials that enter this system are transported directly to our creeks and streams without any treatment.

Our major responsibilities include:

For stormwater quality purposes:

  • Responding to citizen requests;
  • Controlling the direct or indirect introduction of pollutants into the MS4 by stormwater discharges from any source or user;
  • Controlling the introduction into the MS4 of any spills or dumped or disposed material other than stormwater;
  • Prohibiting illicit connections and illegal discharges to the MS4;
  • Inspecting and monitoring the MS4 to ensure compliance with applicable stormwater requirements;
  • Inspecting and enforcing stormwater requirements at construction sites;

For stormwater maintenance purposes:

  • Responding to citizen requests;
  • Providing for the management and maintenance of the MS4 for flood control purposes;
  • Performing erosion control and debris removal within publicly owned drainage ways;
  • Maintaining approximately 102 miles of storm sewers;
  • Maintaining bridges and culverts;
  • Conducting street sweeping on major arterial and collector streets;
  • Providing emergency disaster response related to flooding, winter storms, severe storms, and non-hazardous material chemical spills;
  • Providing right-of-way vegetation maintenance; and
  • Coordinating rural drainage improvement projects with Cleveland County.

What is Stormwater?
Stormwater is water that runs off impervious surfaces such as rooftops, roadways, driveways, parking lots, and other hard surfaces.  All properties that have these features generate stormwater runoff.


Where does Stormwater go when it runs off my roof or driveway?
In urban areas, stormwater runoff from impervious surfaces flows along the side of the road until it reaches a storm drain, which is an opening or grate in the curb.  From there, the water flows through a series of underground pipes, open channels, or ditches (the MS4) until it reaches the nearest creek or stream.  This water is not treated along the way so any pollutants (oil, trash, fertilizer, pesticides) it may be carrying are deposited directly into our local creeks and streams and eventually reach Lake Thunderbird or the Canadian River.

Why should I be concerned about Stormwater runoff?

Stormwater runoff can carry pollution from impervious surfaces to nearby creeks and streams through the City of Norman’s storm sewer system.  Any pollutant exposed to stormwater is at risk of being washed into storm drains and carried to local waters that we use for drinking water and/or recreation, like Lake Thunderbird.

In addition to the potential to pollute our creeks and streams, increased volumes of stormwater runoff from impervious surfaces can lead to flooding.  As we add houses, driveways, roadways, and parking lots, the areas where water can soak into the ground decreases.  As a result, the volume of water that runs off these areas increases.  During heavy rainfall events, our storm sewer system can be overwhelmed by this volume and result in flooding of low-lying areas.