NPDES Permit

In Contra Costa, public streets and sidewalks are connected directly to water habitats through a system of storm drains, pipes, ditches and channels.  These municipal stormwater systems convey runoff that may result after rain events into local creeks, bays and/or deltas without any treatment.  Unfortunately, if municipal, industrial and construction activities are not properly managed, then stormwater systems can also bring trash, chemicals, sediment, and other pollutants to local water bodies. 

In the 1970s, the National Pollutant Discharge Elimination System (NPDES) Stormwater Permit program was created to prevent stormwater runoff from polluting surface waters.  The NPDES requires public agencies to obtain a permit before discharging untreated stormwater into waterways.  

The Contra Costa Clean Water Program's (CCCWP's) 21 agencies are Permittees in the Municipal Regional Stormwater NPDES Permit (PDF) (MRP) issued by the California Regional Water Quality Control Board for the San Francisco Bay Region (RWQCB).  This means that each Contra Costa Permittee must prohibit the discharge of anything other than rain into its jurisdiction's stormwater system.


(Coming Soon) Overview of New Permit Requirements in MRP 3.0

The San Francisco Bay Regional Water Quality Control Board has adopted the third reissuance of the Municipal Regional Stormwater Permit, or MRP 3.0.  This reissuance includes significant changes and additional requirements in certain provisions. Summary of key changes coming soon. 

Please note that the MRP related resources referenced in this site are in the process of being updated to reflect new permit requirements.  Stay tuned!



MRP 3.0 Provisions C.2 through C.22 include requirements for one-time and ongoing activities that the Permittees must implement over the course of the Permit term, which began July 1, 2022 and extends to June 30, 2027. The table below shows some key Permit provisions and links to pages on this website that describe Program activities to assist Permittees to implement the provision.

Permit Provision

Provision Title

Relevant Pages on

Additional Notes


Municipal Operations

Municipal Operations

New requirements for Corporation Yard SWPPPs, Best Management Practices (BMPs), and Trainings (C.2.f., C.2.h.) 


New Development and Redevelopment

C.3 Requirements: Development

New in MRP 3.0

C.3 Update Handout for Developers, Engineers, Planners, and Project Applicants (PDF)

New requirements that affect developers and planners, including thresholds for Regulated Projects, for which Low Impact Development (LID) source control and other design/treatment measures are required (C.3.b.).


Green Infrastructure Planning and Implementation

Green Infrastructure



Industrial and Commercial Site Controls

Business Inspections

New requirements for Industrial and Commercial Business Inspection Plans (C.4.b.)


Illicit Discharge Detection and Elimination (IDDE)

Report Illegal Dumping and Spills

Illicit Discharges

New requirements for legal authority, spill response program, mobile sources, tracking, Enforcement Response Plans (ERP), and Municipal Separate Storm Sewer (MS4) maps (C.5.a.-f.) 


Control of Mobile Sources

Mobile Cleaners and Businesses Brochure (PDF)

Carpet Cleaners Brochure (PDF)

Inventories must be updated at least annually.


Construction Site Control

Requirements for Construction



Public Information and Outreach




Watershed Stewardship Collaborative Efforts




School-Age Children Outreach




Water Quality Monitoring




Creek Status Monitoring

Creek Status



Pollutants of Concern

Pollutants of Concern



Pesticides Toxicity Control

Yards, Gardens, and Pets




Trash Load Reduction


Trash BMPs for Businesses Brochure (PDF)



Mercury Controls

Pollutants of Concern

Mercury Contamination Brochure (Don’t Trash Fluorescent Bulbs (PDF)



Polychlorinated Biphenyls (PCBs) Controls

Pollutants of Concern

C.13 Copper (Cu) Controls Copper  


Bacteria Control for Impaired Water Bodies


N/A (not relevant to CCCWP)


Exempted and Conditionally Exempted Discharges




Discharge Type – Swimming Pool, Hot Tub, Spa, and Fountain Water Discharges

Draining Pools and Spas Brochure (PDF)

C.16 Areas of Special Biological Significance   N/A (not relevant to CCCWP)


Discharges Associated with Unsheltered Populations and Homelessness  

If you are experiencing or at risk of homelessness in Contra Costa, 

Call 211, Text "HOPE" to 20121, or visit for resources, information, and free, confidential services available 24/7


New Provision!

Note for Permittees:  Unsheltered homelessness is also part of Direct Discharge Control Plan requirements (C.10.f.ii.)

C.18 Control of Sediment Discharges in Coastal San Mateo   N/A (not relevant to CCCWP)
C.19 East Contra Costa County   Relevant to eastern Contra Costa municipalities (Antioch, Brentwood, Oakley, Unincorporated County, CCCFCWCD)
C.20 Cost Reporting    
C.21 Asset Management   New Provision!
C.22 Annual Reporting  

Annual Reports of each Fiscal Year (July 1 through June 30) must be submitted to the Water Board by September 30.