Regional Permit Program Page
The Los Angeles Water Board regulates discharges from medium and large municipal separate storm sewer systems (MS4s) through the Regional Phase I MS4 Permit. This permit is issued under the National Pollutant Discharge Elimination System (NPDES) Program.
REGIONAL MS4 PERMIT (ORDER NO. R4-2021-0105)
- Order
- Attachment A Definitions
- Attachment B WMA Maps
- Attachment C MS4 Maps
- Attachment D Standard Provisions
- Attachment E MRP
- Attachment F Fact Sheet
- Attachment G Aquatic Toxicity
- Attachment H Annual Reporting Forms (pdf)
- Attachment H WMP Progress Report Form (Word) - Available upon request MS4StormwaterRB4@waterboards.ca.gov
- Attachment H Annual Report Form (Word) - Available upon request MS4StormwaterRB4@waterboards.ca.gov
- Attachment I Trash Reporting Forms Cover Page (pdf)
- Attachment I Trash TMDL Reporting Forms (Excel)
- Attachment I Trash Discharge Prohibitions Reporting Forms (Excel)
- Attachment J Permittees & TMDL Matrix
- Attachment K Ventura River TMDLs
- Attachment L Ventura County Miscellaneous Coastal TMDLs
- Attachment M Santa Clara River TMDLs
- Attachment N Calleguas Creek TMDLs
- Attachment O Santa Monica Bay TMDLs
- Attachment P Dominguez Channel TMDLs
- Attachment Q Los Angeles River TMDLs
- Attachment R San Gabriel River TMDLs
- Attachment S Los Cerritos Channel and Alamitos Bay TMDLs
Past Regional Permit Information:
- Second Revised Order of Proceedings for The Public Hearing on The Revised Tentative Regional Phase I Municipal Separate Storm Sewer System (MS4) National Pollutant Discharge Elimination System (NPDES) Permit for The Los Angeles Region
- Rulings on Objections to Hearing Procedures
- Change Sheet #1
- Change Sheet #2
- Order of Proceedings for The Public Hearing On The Revised Tentative Regional Phase I Municipal Separate Storm Sewer System (MS4) National Pollutant Discharge Elimination System (NPDES) Permit for The Los Angeles Region
- Notice of Hearing and Availability of Documents on the Revised Tentative Regional Phase I Municipal Separate Storm Sewer System (MS4) Permit
-
Revised Tentative Regional Phase I Municipal Separate Storm Sewer System (MS4) Permit
- Order
- Attachment A Definitions
- Attachment B WMA Maps
- Attachment C MS4 Maps
- Attachment D Standard Provisions
- Attachment E MRP
- Attachment F Fact Sheet
- Attachment G Aquatic Toxicity
- Attachment H Annual Reporting Forms (pdf)
- Attachment I Trash Reporting Forms (pdf)
- Attachment I Trash TMDL Reporting Forms (Excel)
- Attachment I Trash Discharge Prohibitions Reporting Forms (Excel)
- Attachment J Permittees & TMDL Matrix
- Attachment K Ventura River TMDLs
- Attachment L Ventura County Miscellaneous Coastal TMDLs
- Attachment M Santa Clara River TMDLs
- Attachment N Calleguas Creek TMDLs
- Attachment O Santa Monica Bay TMDLs
- Attachment P Dominguez Channel TMDLs
- Attachment Q Los Angeles River TMDLs
- Attachment R San Gabriel River TMDLs
- Attachment S Los Cerritos Channel and Alamitos Bay TMDLs
- Response to Comments on the Tentative Regional Phase I Municipal Separate Storm Sewer System (MS4) Permit
- Workshops
Contacts
Program Supervisor
Ivar Ridgeway
(213) 620-2150
Senior Environmental Scientist (Supervisor)
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Staff
Alireza Rahmani
(213) 576-6692
Water Resource Control Engineer
Angineh Shahnazarian
(213) 576-6617
Environmental Scientist
Erum Razzak
(213) 620-2095
Environmental ScientistHarumi Goya
(213) 620-2283
Engineering Geologist
Jessica Pearson
(213) 576-6786
Water Resource Control Engineer
Susana Vargas
(213) 576-6688
Water Resource Control Engineer
