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
22
Phase II Category 1
(population < 10,000)
24
Phase II Category 2
(population of 10,000 – 50,000)
6
Phase II Category 3
(population > 50,000)
2
Phase I
(population > 100,000)
Latest News and Updates
Job Opportunity: ODOT
JOB ANNOUNCEMENT The Oklahoma Department of Transportation (ODOT) is seeking two new Environmental Field Liaisons- one based in Muskogee and one in Perry. Details: Muskogee Location: Interested? Apply here. Perry Location: Interested? Apply here.
Congratulations to New Board Officers, 2025-2027 Term
The election results are in! Join us in congratulating our new Board Officers for the 2025-2027 term: The new officers will assume their roles during their first Board Meeting, scheduled for Thursday, October 16.
Call for Abstracts – 2025 SCIECA Conference in Oklahoma City
Call for Abstracts! The 2025 Conference of the South Central Chapter of the International Erosion Control Association is being held right here in Oklahoma City! Share your expertise in one or more of the following tracts: Submit your abstract here ieca.org/regionalabstracts
Central Oklahoma Stormwater Alliance, Inc.
EIN # 85-3458893
P.O. Box 42, Oklahoma City, OK 73101
2025-2026 Corporate Member
COSWA 