Watershed Management Programs, Monitoring Programs, and
Baseline Permittees
The Regional MS4 Permit allows Permittees the flexibility to develop Watershed Management Programs (WMPs) to implement the requirements of the Permit on a watershed scale through customized strategies, control measures, and best management practices (BMPs). Participation in a Watershed Management Program is voluntary and allows a Permittee to address the highest watershed priorities, including complying with the requirements of Part V (Receiving Water Limitations), Part IV and Attachments K through S of the Order (Total Maximum Daily Load Provisions), Part III (Discharge Prohibitions), and Part VIII (Minimum Control Measures). Permittees who choose not to participate in a Watershed Management Program are subject to baseline requirements of the Regional MS4 Permit.
Additionally, the Regional MS4 Permit requires Permittees to implement an Integrated Monitoring Program (IMP) or a Coordinated Integrated Monitoring Program (CIMP) per Attachment E of the Order (Monitoring and Reporting Program) consistent with applicable requirements in Attachment E of the Order, monitoring provisions in applicable TMDLs, and specifically, with Attachments K through S of the Order.
Associated documents/links for the aforementioned programs are available below. If you have any questions or need to request documents not found below, please contact Ivar Ridgeway, Senior Environmental Scientist of the Municipal Storm Water Permitting Unit at (213) 620-2150. Alternatively, you can email MS4StormwaterRB4@waterboards.ca.gov.
| Name | Permittee(s) (Bold = Lead Coordinator) | WMP Participant? | Monitoring Program | Watershed Management Area(s) | WMP Reporting Website(s) | MS4 Staff |
|---|---|---|---|---|---|---|
| Name | Permittee(s) (Bold = Lead Coordinator) | WMP Participant? | Monitoring Program | Watershed Management Area(s) | WMP Reporting Website(s) | MS4 Staff |
| Alamitos Bay/Los Cerritos Channel | Los Angeles County, LACFCD | Yes | CIMP | Los Cerritos Channel and Alamitos Bay | Link | Jessica Pearson |
| Azusa | Azusa | No | IMP | San Gabriel River | N/A | Alireza Rahmani |
| Ballona Creek | Beverly Hills, Culver City, Inglewood, Los Angeles, Santa Monica, West Hollywood, Los Angeles County, LACFCD | Yes | CIMP | Santa Monica Bay | Link | Erum Razzak |
| Beach Cities | Hermosa Beach, Manhattan Beach, Redondo Beach, Torrance, LACFCD | Yes | CIMP | Santa Monica Bay, Dominguez Channel | Link | Susana Vargas |
| Compton | Compton | No | Lower Los Angeles River CIMP | Los Angeles River, Dominguez Channel | N/A | Angineh Shahnazarian |
| Dominguez Channel | Carson, El Segundo, Hawthorne, Inglewood, Lawndale, Lomita, Los Angeles, Los Angeles County, LACFCD | Yes | CIMP | Dominguez Channel* | Link | Harumi Goya |
| East San Gabriel Valley | Claremont, La Verne, Pomona, San Dimas | Yes | CIMP | San Gabriel River | Group Link City of San Dimas |
Angineh Shahnazarian |
| El Monte | El Monte | Yes | IMP | Los Angeles River, San Gabriel River | Link | Angineh Shahnazarian |
| Gardena | Gardena | No | IMP | Dominguez Channel | N/A | Alireza Rahmani |
| Irwindale | Irwindale | No | IMP | Los Angeles River, San Gabriel River | N/A | Harumi Goya |
| La Habra Heights | La Habra Heights | Yes | IMP | San Gabriel River | Link | Susana Vargas |
| Los Angeles River Upper Reach 2 | Bell, Bell Gardens, Commerce, Cudahy, Huntington Park, Maywood, Vernon, LACFCD | Yes | CIMP | Los Angeles River | Link | Alireza Rahmani |
| Los Cerritos Channel | Bellflower, Cerritos, Downey, Lakewood, Long Beach, Paramount, Signal Hill, LACFCD | Yes | CIMP | Los Cerritos Channel and Alamitos Bay | Link | Jessica Pearson |
| Lower Los Angeles River | Downey, Long Beach, Lakewood, Lynwood, Paramount, Pico Rivera, Signal Hill, South Gate, LACFCD, Compton (CIMP only) | Yes | CIMP | Los Angeles River | Link | Alireza Rahmani |
| Lower San Gabriel River | Artesia, Bellflower, Cerritos, Diamond Bar, Downey, Hawaiian Gardens, La Mirada, Lakewood, Long Beach, Norwalk, Pico Rivera, Santa Fe Springs, Whittier, LACFCD | Yes | CIMP | San Gabriel River | Link | Alireza Rahmani |
| Machado Lake | City of Torrance | Yes | Beach Cities CIMP | Dominguez Channel | Link | Susana Vargas |
| Malibu Creek Watershed | Agoura Hills, Calabasas, Hidden Hills, Westlake Village, Los Angeles County, LACFCD | Yes | CIMP | Santa Monica Bay | Link | Harumi Goya |
| Marina Del Rey | Culver City, Los Angeles, LACFCD, Los Angeles County | Yes | CIMP | Santa Monica Bay | Link | Harumi Goya |
| Nearshore Watersheds | Long Beach | Yes | Port IMP and Non-Port IMP | Dominguez Channel, Los Angeles River, San Gabriel River, Los Cerritos Channel and Alamitos Bay | Link | Ivar Ridgeway |
| North Santa Monica Bay Coastal Watersheds | Los Angeles County, LACFCD, Malibu | Yes | CIMP | Santa Monica Bay | Link | Jessica Pearson |
| Palos Verdes Peninsula | Palos Verdes Estates, Rancho Palos Verdes, Rolling Hills Estates, Rolling Hills, Los Angeles County, LACFCD | Yes | CIMP | Santa Monica Bay, Dominguez Channel | Link | Susana Vargas |
| Rio Hondo/San Gabriel River | Arcadia, Bradbury, Duarte, Monrovia, Los Angeles County, LACFCD, Sierra Madre | Yes | CIMP | Los Angeles River, San Gabriel River | Link | Susana Vargas |
| Santa Monica Bay Watershed Jurisdiction 7 | Los Angeles, LACFCD | No | CIMP | Santa Monica Bay | Link | Angineh Shahnazarian |
| Santa Monica Bay Watershed Jurisdictional Groups 2 & 3 | Los Angeles, El Segundo, Santa Monica, Los Angeles County, LACFCD | Yes | CIMP | Santa Monica Bay | Link | Angineh Shahnazarian |
| Upper Los Angeles River | Alhambra, Burbank, Calabasas, Glendale, Hidden Hills, La Canada Flintridge, Los Angeles, Montebello, Monterey Park, Pasadena, Rosemead, San Fernando, San Gabriel, San Marino, South El Monte, South Pasadena, Temple City, Los Angeles County, LAFCD | Yes | CIMP | Los Angeles River** | Link | Angineh Shahnazarian |
| Upper San Gabriel River | Baldwin Park, Covina, Glendora, City of Industry, La Puente, West Covina, South El Monte (CIMP only), LACFCD, Los Angeles County | Yes | CIMP | San Gabriel River | Link | Alireza Rahmani |
| Upper Santa Clara River | Los Angeles County, LACFCD, Santa Clarita | Yes | CIMP | Santa Clara River | Link | Erum Razzak |
| Ventura County | Camarillo, Fillmore, Moorpark, Ojai, Oxnard, Port Hueneme, Santa Paula, Simi Valley, Thousand Oaks, Ventura, VCWPD, and Ventura County | Yes | CIMP | Ventura River, Miscellaneous Ventura County Coastal Watersheds, Santa Clara River, Calleguas Creek, Santa Monica Bay | Erum Razzak | |
| Walnut | Walnut | Yes | IMP | San Gabriel River | Link | Jessica Pearson |
Table Notes
* A small portion of the City of Carson is within the Los Angeles River watershed.
**A small portion of the City of South El Monte is within the San Gabriel River watershed.
