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 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 | Erum Razzak |
| 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 | Farzad Kasmaei |
| 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 | Farzad Kasmaei |
| 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 | Jessica Pearson |
| 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 | Erum Razzak |
| 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 | Farzad Kasmaei |
| 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 | Farzad Kasmaei |
| Rio Hondo/San Gabriel River | Arcadia, Bradbury, Duarte, Monrovia, Los Angeles County, LACFCD, Sierra Madre | Yes | CIMP | Los Angeles River, San Gabriel River | Link | Harumi Goya |
| 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.
