Stormwater, as defined by the Clean Water Act regulations 40 CFR § 122.26(b)(13), includes stormwater runoff, snow melt runoff, and surface runoff and drainage. Stormwater runoff occurs when precipitation from rain or snowmelt flows over the ground. Impervious surfaces like parking lots, rooftops, driveways, sidewalks, and streets prevent stormwater from naturally soaking into the ground. Increased stormwater runoff can cause flood­ing and hydrologic changes to the receiving waters. During overland flow, stormwater generally picks up debris, chemicals, dirt, and other pollutants and flows into a storm sewer system or directly to a lake, stream, river, or wetland. Anything that enters a storm sewer system is discharged into the waterbodies used for swimming, fishing, and/or providing drinking water. Polluted stormwater runoff can have many adverse effects on plants, fish, animals, and people. The primary method to control stormwater discharges is the use of structural and non-structural best management practices (BMPs).

Most stormwater discharges are considered point sources and require coverage under an NPDES permit. The National Pollutant Discharge Elimination System (NPDES) Stormwater Program regulates stormwater discharges from three potential sources: municipal separate storm sewer systems (MS4s), construction activities, and industrial activities. EPA authorized DEQ to implement NPDES stormwater permit program within the State of Oklahoma. Program specific information, current permit and related documents are available at the following links:

History of Stormwater Program

The Clean Water Act, passed in 1972, prohibited the discharge of any pollutant to navigable waters from a point source unless the discharge was authorized by a National Pollution Discharge Elimination System (NPDES) permit. In 1973, EPA adopted regulations which exempted stormwater discharges from permitting requirements except where their discharges were identified as significant contributors to water pollution. The National Urban Runoff Program (NURP) of 1983 report identified that contaminated stormwater as one of the major cause for degraded water quality. On February 4, 1987, Congress enacted the Water Quality Act of 1987 to address the stormwater runoff. The 1987 Water Quality Act added section 402 (p) to the Clean Water Act, requiring that EPA issue NPDES permits for five categories of stormwater discharges. On November 16, 1990, EPA promulgated regulations (40 CFR § 122.26) , which is known as Phase I Stormwater Program, for stormwater discharges from MS4 serving a population 100,000 & more and stormwater discharges from industrial activity. The Phase I industrial stormwater program requires permitting for construction sites which disturb five or more acres and for numerous types of industrial facilities which are identified in the regulations by standard industrial classification (SIC) code or narrative description. EPA issued final Phase II Stormwater regulations on December 8, 1999 to address discharges not covered by Phase I regulations. Phase II regulations require stormwater permits by March 10, 2003 for numerous small MS4s, construction sites of one to five acres, and industrial facilities owned or operated by small MS4s which were previously exempted.

On September 9, 1997, EPA delegated all the responsibility to DEQ to administer stormwater discharges associated with construction and industrial activities and from MS4s. This delegation excluded facilities located in Indian Land and Oil & Gas Exploration fields.

Archived Documents

Expired permits under construction, industrial and municipal stormwater programs and related documents are available at the following links:

Construction Stormwater

2012 OKR10 Construction General Permit

Notice of Intent Form 606-002A | Notice of Termination Form 605-003 | Inspection Request | Contractor Certification | Buffer Guidance | Additional Requirements For Concrete And Asphalt Batch Plants

2012 Storm Water General Permit for Construction Activities (OKR10)

Final Permit | Fact Sheet | Responses to Comments | PowerPoint Presentation
13 Aug 2012

Public Notice – 2012 Stormwater General Permit for Construction Activities (OKR10)
28 Jun 2012

Draft 2012 OKR10 Stormwater Construction General Permit
28 Jun 2012

Draft 2012 OKR10 Stormwater Construction General Permit Fact Sheet
28 Jun 2012

Industrial Stormwater

Industrial Multi-Sector General Permit (MSGP) Stormwater Permit
5 Aug 2011
Final Permit | Fact Sheet | Response to Comments

NOI – Notice of Intent

NOT – Notice of Termination

NEC – No Exposure Certification

NCIE – Notice of Certification of Industrial Existence

ACSCER – Annual Comprehensive Site Compliance Evaluation Report

Spill Prevention and Response Procedures Checklist

Endangered Species

Municipal Stormwater

OKR04 Outreach
Regulatory History | Permit Overview | 2016 Clean Watersheds Needs Survey | Funding Stormwater Projects | What’s Changed/What’s New | How to Apply/Reapply

Small MS4 General Permit
Public Notice | Permit | Fact Sheet
31 Mar 2015

Oklahoma City MS4 Permit
Public Notice | Final Permit | Fact Sheet | Responses To Comments
15 Mar 2013

Tulsa MS4 Permit
Final Permit | Fact Sheet | Response to Comments
26 Sep 2011

Presentation from 24 Apr 2009 Small MS4 Stakeholders Meeting

Presentation from 27 Feb 2009 Small MS4 Stakeholders Meeting

MS4 Operators Conference
agenda | announcement | registration form | EPA website