Central Oklahoma Stormwater Alliance, Inc. (COSWA) is a central Oklahoma-based 501(c)(3) non-profit organization composed of MS4s, public agencies, and private businesses that collaborate and pool resources to satisfy OPDES permit obligations on a regional level.


What We Do

We participate in public outreach events to educate our local community about water quality and pollution prevention.

We promote the use of rain barrels to help mitigate pollutant discharges and potential downstream flooding.

We work collaboratively to increase public awareness of stormwater and other environmental issues.

Regulated MS4s in Oklahoma


2

Phase I MS4s

52

Phase II MS4s

7

Counties

4

Non-Traditional MS4s

Latest News and Updates


1st Annual Contractor Construction Compliance Conference, October 27

The Association of Oklahoma General Contractors (AOGC), in partnership with ODOT, OTA, and DEQ, is hosting a 1-day conference all about construction compliance in regards to sediment and erosion control. DEQ personnel will be in attendance to provide updates and answer questions about the new construction stormwater general permit regulations. Vendors will have information about… Continue reading 1st Annual Contractor Construction Compliance Conference, October 27

Grand River Dam Authority (GRDA) Erosion & Sediment Control Stormwater Construction Inspector Training Event

The GRDA is offering a FREE 6-hr workshop on the OKR10 Construction General Permit requirements and BMPs for erosion and sediment control. The workshop is open to anyone that oversees construction projects or has inspection responsibilities, such as: GRDA staff, contractors, city officials, and tribal officials. To register, visit https://bit.ly/3S9mfm0 or scan the QR code… Continue reading Grand River Dam Authority (GRDA) Erosion & Sediment Control Stormwater Construction Inspector Training Event