County Stormwater Program
Please be advised that the County Stormwater Program is implementing the 2021 Regional Stormwater Permit, as of May 12, 2025.
This department’s role in your permit
Please be advised that the County Stormwater Program is implementing the 2021 Regional Stormwater Permit, as of May 12, 2025.
The County Stormwater Program reviews proposed land development projects to prevent adverse impacts to the surface water quality and ensure compliance with requirements in the Los Angeles Regional Water Quality Control Board National Pollution Discharge Elimination System (NPDES) Municipal Separate Storm Sewer Systems (MS4) Permit, No. CAS004004 (Permit).
Phases we participate in
Phases Stormwater Program participates in Other phases in the process
- 1
Determine whether you need a discretionary planning permit to complete your project.
Departments involved: Building & Safety, Planning
- 2
Gather information about your site, the regulations that apply, and potential constraints.
Departments involved: County Surveyor, Groundwater, Planning
- 3
Meet with the Discretionary Permit Coordinator and/or Development Review Committee.
Departments involved: Agricultural Commissioner, Engineering Services, Environmental Health, Fire Department, Planning, Transportation
- 4
Assemble required materials and submit to the Planning Division for completeness review.
Departments involved: Engineering Services, Planning
- 5
Application Review Stormwater Program
County staff begins project review and preparation of environmental documents.
Departments involved: Agricultural Commissioner, Air Pollution Control District, Environmental Health, Fire Department, Groundwater, Planning, Stormwater Program, Transportation, Watercourse / Encroachment
- 6
County staff evaluates your project's potential environmental impacts.
Departments involved: Air Pollution Control District, Environmental Health, Planning
- 7
The decision-maker approves or denies the discretionary planning permit.
Departments involved: Planning
- 8
Completing Your Project Stormwater Program
Learn about the other permits you may need beyond the discretionary planning permit.
Departments involved: Air Pollution Control District, Building & Safety, Engineering Services, Environmental Health, Fire Department, Planning, Stormwater Program, Transportation, Watercourse / Encroachment
- 9
Periodic review of discretionary permits to ensure compliance with approved conditions.
Departments involved: Building & Safety, Environmental Health, Planning
Forms, fees & reference documents
Industrial Facilities
New Development and Redevelopment Projects Deemed Complete After May 11, 2025
- 2025 Technical Guidance Manual Tool
- 2025 Technical Guidance Manual
- New and Redevelopment Projects (2021 MS4 Permit)
- 2021 Regional Permit
- Stormwater Treatment Facility Maintenance Record Verification
New Development and Redevelopment Projects Deemed Complete Between October 11, 2011 and May 11, 2025
If your proposed project meets New Development or Redevelopment criteria of the 2010 Ventura County Stormwater Municipal Permit (Order No. R4-2010-0108) for the created, added, or replaced impervious or total surface area and was deemed complete after October 11, 2011, it shall address Permit requirements for post-construction stormwater controls documented in the following:
- 2011 TGM Tool, Used for the design of the PCSMP control systems.
- Stormwater Treatment System Access and Maintenance Agreement, Ensures on-going maintenance of the post-construction stormwater controls.
To verify proper maintenance, the project owner shall submit the Stormwater Treatment Facility Maintenance Record Verification form each year by September 15th.
New Development and Redevelopment Deemed Complete Prior to October 11, 2011
If the proposed project meets New Development or Redevelopment criteria of the 2000 Ventura County Stormwater Municipal Permit (Order No. 00-108), the proposed design shall address Permit requirements including Stormwater Quality Urban Impact Mitigation Plan (SQUIMP) to mitigate stormwater pollution. The project documentation shall include:
To verify proper maintenance, the project owner shall submit the Stormwater Treatment Facility Maintenance Record Verification form each year by September 15th.
Construction Requirements for all Projects
The following worksheet is required to identify stormwater best management practices required at construction sites.
Industrial Business
Others
If your proposed project is determined to have impact on surface water quality or stormwater runoff, additional water quality mitigation measures may apply.
No policy information available at this time.
No fee information available at this time.
Need help from County Stormwater Program?
Reach out using the contact details above, or see how this department fits into the broader permitting process.