Storm Water - Municipal Program Logo

Los Angeles County MS4 Permit

Proposed Alternative Biofiltration Design Specification (posted January 31, 2018)

Proposed Alternative Biofiltration Design Specification (posted December 8, 2017)

Proposed Trash Monitoring and Reporting Plans (posted October 13, 2017)

Proposed Alternative Biofiltration Design Specification – Filterra (posted July 27, 2017)

Los Angeles River Trash TMDL Alternative Compliance Plans

AMENDMENT OF LOS ANGELES COUNTY MS4 PERMIT (POSTED NOVEMBER 23, 2016)

Tentative Approval of the City of Santa Monica's Request for LID Ordinance Equivalency (posted October 5, 2015)

The Regional Water Board is required to provide public notice of the proposed equivalency determination with a minimum 30-day period for public comment. All comments must be received by 5PM on November 2, 2015. See tentative approval for comment submission instructions.

LOS ANGELES COUNTY MS4 PERMIT (ORDER NO. R4-2012-0175) AS AMENDED BY THE STATE WATER BOARD ON JUNE 16, 2015 BY ORDER WQ 2015-0075 (posted July 1, 2015)

Time Schedule Order No. R4-2015-0108 requiring the City of Los Angeles, the County of Los Angeles, the Los Angeles County Flood Control District, the City of Beverly Hills, the City of Culver City, the City of Inglewood, and the City of West Hollywood to comply with requirements prescribed in Order No. R4-2012-0175 (NPDES Permit No. CAS004001)

Time Schedule Order No. R4-2014-0142 Requiring the County of Los Angeles, the Los Angeles County Flood Control District and the City of Los Angeles to Comply With Requirements Pertaining to Discharges of Bacteria During Dry Weather to the Back Basins of Marina Del Rey Harbor and Marina Beach Prescribed in Order No. R4-2012-0175 (NPDES Permit NO. CAS004001)

Time Schedule Order No. R4-2014-0023 Requiring the City of Los Angeles (Inner Cabrillo Beach, Los Angeles Harbor) To Comply With Requirements Prescribed in Order No. R4-2012-0175 (NPDES Permit No. CAS004001)

LARWQCB Response to Petitions A-2236(a) through (kk)

Administrative Record for Order No. R4-2012-0175 (Note: Some of the files are large. Please be patient when opening the files; it may take a moment.)

Implementation of the Los Angeles County Areawide MS4 Permit

Final Waste Discharge Requirements for Municipal Separate Storm Sewer System (MS4) Discharges within the Coastal Watersheds of Los Angeles County, Except Those Discharges Originating from the City of Long Beach MS4 (posted December 5, 2012)


Second (2nd) Revised Tentative Waste Discharge Requirements for Municipal Separate Storm Sewer System (MS4) Discharges within the Coastal Watersheds of the County of Los Angeles, Except Those Discharges Originating from the City of Long Beach (posted November 5, 2012).

List of Attachments that have been revised

Response to Comments on the June 6, 2012, draft of the Tentative Waste Discharge Requirements for Municipal Separate Storm Sewer System (MS4) Discharges within the Coastal Watersheds of Los Angeles County, Except Those Discharges Originating from the City of Long Beach (posted October 23, 2012)

  1. Non-Stormwater Discharges Matrix
  2. Receiving Water Limitations Matrix
  3. Monitoring and Reporting Program Matrix
  4. Watershed Management Program Matrix
  5. Minimum Control Measures Matrix
  6. Total Maximum Daily Loads (General) Matrix
  7. Total Maximum Daily Loads (Specific) Matrix
  8. General and Miscellaneous Matrix
  9. Supplemental MCM Matrix (posted November 6, 2012)
  10. USEPA Comment Matrix (posted November 6, 2012)

Revised Tentative Waste Discharge Requirements For Municipal Separate Storm Sewer System (MS4) Discharges Within The Coastal Watersheds Of The County Of Los Angeles, Except Those Discharges Originating From The City Of Long Beach (posted October 18, 2012)



October 4-5, 2012 Public Hearing on Tentative LA County MS4 Permit


Technical Comments on the June 6, 2012, draft of the Tentative Waste Discharge Requirements for Municipal Separate Storm Sewer System (MS4) Discharges within the County of Los Angeles Flood Control District, Including the County of Los Angeles and Incorporated Cities therein, except the City of Long Beach. All comments received by July 23, 2012, are included in the following groups: (Updated August 7, 2012)


Tentative Waste Discharge Requirements For Municipal Separate Storm Sewer System (MS4) Discharges Within The County Of Los Angeles Flood Control District, Including The County of Los Angeles and Incorporated Cities Therein, Except The City Of Long Beach (posted June 6, 2012)


May 3, 2012 Board Workshop

Staff Working Proposals for LA County MS4 Permit Reissuance

  1. Transmittal Memo for Working Proposals
    1. Working Proposal of Watershed Management Program Provisions
    2. Working Proposal of TMDL Provisions
    3. Working Proposal of Receiving Water Limitation Provisions

April 5, 2012 Board Workshop

Contacts

Program Supervisor
Ridgeway, Ivar
Ivar.Ridgeway@waterboards.ca.gov
(213) 620-2150
Senior Environmental Scientist