San Diego Region - TMDLs for Impaired Lagoons, Adjacent Beaches, and Agua Hedionda Creek
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Seven lagoons and Agua Hedionda Creek were placed on the Section 303(d) List of Water Quality Limited Segments for water quality impairments due to nutrients/eutrophication, bacteria, sediment/siltation, total dissolved solids (TDS), or a combination of these pollutants. The Pacific Ocean shorelines (i.e., beach segments) adjacent to Loma Alta Slough, Buena Vista Lagoon, and San Elijo Lagoon, are also on the List for bacteria impairments. The water quality limited segments and their impairing pollutants are shown in the table below.
Water Quality Limited Segments and Impairing Pollutants
| Hydrologic Descriptor | Water Quality Limited Segment | Nutrients/ Eutrophication | Sedimentation/ Siltation | TDS | Bacteria |
|---|---|---|---|---|---|
| Lower Ysidora HSA (902.11) | Santa Margarita Lagoon | Yes |
|||
| Loma Alta HA (904.10) | Loma Alta Slough | Yes |
Yes |
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| Loma Alta HA (904.10) | Pacific Ocean Shoreline at Creek | Yes |
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| El Salto HSA (904.21) | Buena Vista Lagoon | Yes |
Yes |
Yes |
|
| Buena Vista Creek HA (904.20) | Pacific Ocean Shoreline at Creek | Yes |
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| Los Monos HSA (904.31) | Agua Hedionda Lagoon | Yes |
Yes |
||
| Los Monos HSA (904.31) | Lower Agua Hedionda Creek | Yes |
|||
| San Elijo HSA (904.61) | San Elijo Lagoon | Yes |
Yes |
Yes |
|
| Escondido Creek HA (904.60) | Pacific Ocean Shoreline at Lagoon | Yes |
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| Miramar Reservoir HA (906.10) | Los Penasquitos Lagoon | Yes |
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| Mission San Diego HSA (907.11) | Famosa Slough & Channel | Yes |
The San Diego Water Board is investigating the water quality impairments in these waterbodies and will develop a total maximum daily load (TMDL) for each impairing pollutant in each listed waterbody. The San Diego Water Board has issued Investigation Order No. R9-2006-0076 requiring dischargers of pollutants to these waterbodies or their tributaries to submit the monitoring program reports needed by the San Diego Water Board to assess the water quality impairments in the waterbodies and to parameterize, calibrate and verify watershed and lagoon models of each impaired lagoon system. The lagoon and watershed models will be used to estimate existing pollutant loading, develop TMDLs, and conduct a source analysis for the waterbodies.
Mailing Lists for TMDLs for Impaired lagoons and Agua Hedionda Creek
To receive updates on the TMDLs for Impaired lagoons and Agua Hedionda Creek in the San Diego Region, please send request to Cynthia Gorham-Test at CTest@waterboards.ca.gov. You may also obtain information at your convenience from our Website or by appointment at the San Diego Water Board office.
Public Documents
(All documents are PDF format unless otherwise noted)
- Investigation Order No. R9-2006-0076
- San Diego Lagoons TMDL Monitoring Workplan
- Technical Report for Investigation Order No. R9-2006-0076
For Additional Information
Please contact Cynthia Gorham-Test at (858) 467- 2957 or by email at CTest@waterboards.ca.gov.