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, which is now two documents (2022 and amended in 2023). 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 ProvisionProvision TitleRelevant Pages on cccleanwater.orgAdditional Notes
C.2Municipal OperationsMunicipal OperationsNew requirements for Corporation Yard SWPPPs, Best Management Practices (BMPs), and Trainings (C.2.f., C.2.h.) 
C.3New Development and RedevelopmentC.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.).
C.3.j.Green Infrastructure Planning and ImplementationGreen Infrastructure 
C.4Industrial and Commercial Site ControlsBusiness InspectionsNew requirements for Industrial and Commercial Business Inspection Plans (C.4.b.)
C.5Illicit 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.) 
C.5.e.Control of Mobile SourcesMobile Cleaners and Businesses Brochure (PDF)

Carpet Cleaners Brochure (PDF)
Inventories must be updated at least annually.
C.6Construction Site ControlRequirements for Construction 
C.7Public Information and OutreachResidents/Community 
C.7.eWatershed Stewardship Collaborative EffortsVolunteer 
C.7.f.School-Age Children OutreachSchools 
C.8Water Quality MonitoringMonitoring/Assessment 
C.8.d.Creek Status MonitoringCreek Status 
C.8.f.Pollutants of ConcernPollutants of Concern 
C.9Pesticides Toxicity ControlYards, Gardens, and Pets

C.10Trash Load ReductionTrash/Litter

Trash BMPs for Businesses Brochure (PDF) *NEW*
C.11Mercury ControlsPollutants of Concern

Mercury Contamination Brochure (Don’t Trash Fluorescent Bulbs [PDF])
C.12Polychlorinated Biphenyls (PCBs) ControlsPollutants of Concern 
C.13Copper (Cu) ControlsCopper 
C.14Bacteria Control for Impaired Water Bodies N/A (not relevant to CCCWP)
C.15Exempted and Conditionally Exempted Discharges  
C.15.v.Discharge Type – Swimming Pool, Hot Tub, Spa, and Fountain Water DischargesDraining Pools and Spas Brochure (PDF) 
C.16Areas of Special Biological Significance N/A (not relevant to CCCWP)
C.17Discharges 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.18Control of Sediment Discharges in Coastal San Mateo N/A (not relevant to CCCWP)
C.19East Contra Costa County Relevant to eastern Contra Costa municipalities (Antioch, Brentwood, Oakley, Unincorporated County, CCCFCWCD)
C.20Cost Reporting  
C.21Asset Management New Provision!
C.22Annual Reporting Annual Reports of each Fiscal Year (July 1 through June 30) must be submitted to the Water Board by September 30.