As required by Provision C.6 (PDF) in the Municipal Regional Stormwater NPDES Permit (MRP), Contra Costa municipalities implement a construction site control program to prevent construction site discharges of pollutants and impacts on receiving waters.
Each jurisdiction:
In addition to complying with MRP Provision C.6, construction projects that disturb an acre or more of soil are required to comply with the State Construction General Permit (CGP). Among other things the CGP requires the development of a Stormwater Pollution Prevention Plan (SWPPP) and the implementation of an inspection and monitoring program. See guidance below to learn more.
California Stormwater Quality Best Management Practices (BMPs) Handbook: Construction
2022 CGP Roadshow Recordings (waterboards.ca.gov) (2023)
2022 CGP Fact Sheet (PDF) (CCCWP, 2023)
This fact sheet is meant for development staff involved in designing and planning municipal projects.
CCCWP developed this 2-page overview of the newly issued 2022 CGP.
MRP Provision C.6.f. requires each municipal Permittee to provide training at least every other year to staff responsible for conducting construction site stormwater inspections. The Contra Costa Clean Water Program (CCCWP) organizes and sponsors a C.6 training for its member agencies. Trainings are designed for staff newly assigned to C.6 reviews and also provide a refresher for experienced staff. See below for CCCWP C.6 training materials.
This workshop took place virtually on February 5th, 2026.
C.6 Workshop Save the Date flyer (PDF) – An overview of what this workshop covers.
Materials for the previous C.6 Training Workshops are available in the Archive section at the bottom of this page.
If you will be seeking a grading permit from a Contra Costa municipality, yes, you will need to develop and submit an Erosion Control Plan for approval before your grading permit is issued. Your Erosion Control Plan must include site-specific, seasonally appropriate and effective BMPs and must conform to the local grading and stormwater ordinance. Check with the Permitting Authority for details.
If your construction project disturbance (e.g., clearing, grading, excavation) of one acre or more of land part or is part of a larger common plan of development that in total disturbs one or more acres, you must obtain coverage under the State General Construction Activity Stormwater Permit (Construction General Permit). To obtain coverage under the Construction General Permit, you must file Permit Registration Documents electronically in the State’s on line Stormwater Multiple Application and Report Tracking (SMART) System. You can obtain information about the Construction General Permit at the State Water Board’s web site: https://www.waterboards.ca.gov/water_issues/programs/stormwater/construction.html
If your project is less than one acre, and you are seeking a grading permit, you will need to develop and Erosion Control Plan. See FAQ #1.
Yes. Guidance is available in the California Stormwater Quality Association’s Stormwater Best Management Practice Handbook for Construction: https://www.casqa.org/resources/bmp-handbooks. Note that SWPPPs for the Construction General Permit must be prepared by a Qualified SWPPP Developer (QSD). You can find QSDs using this look-up tool: https://www.casqa.org/training/casqa-qualification-directory
The owner of the land is responsible for compliance with the General Construction Permit. The owner must engage appropriately qualified individuals to develop the SWPPP, a Qualified SWPPP Developer (QSD), and to implement the SWPPP, a Qualified SWPPP Practitioner (QSP).
Visit the State Water Resources Control Board’s construction program web site: https://www.waterboards.ca.gov/water_issues/programs/stormwater/construction.html. You can also email or call for information:
CCCWP C.6 Construction Stormwater Inspection Workshop (January 30, 2024, primarily in-person workshop in Walnut Creek, with an online option)
C.6 Construction Stormwater Training Workshop (March 30, 2022, virtual meeting)
Alameda Countywide Clean Water Program (ACCWP) collaborated with CCCWP to lead a joint-training to review C.6 basics, pending stormwater permit changes, and case studies.
C.6 Construction Workshop (November 14, 2019, in Walnut Creek):
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