Loma Alta Creek
2026 303(d) list Waterbody ID CAR9041000019991117145300 River & Stream Region 9 · San Diego
At a glance
- 2026 listing Evidence: State-published
- On the 2026 303(d) list · 10 Appendix A decisions
- Category 5: a TMDL is required
- What a listing means
- Pollutants and stressors
- 10 pollutants in 6 Appendix A categories
- Metals (1) · Nutrients (2) · Other Cause (1) · Pathogens (1) · Pesticides (4) · Total Toxics (1)
- Listing decisions
- TMDL information Evidence: State-published
- 10 decisions with a TMDL requirement status
- Status codes as published: 5A
- TMDL details
- Industrial stormwater facilities
- 46 report it as their receiving water Evidence: identification corroborated
- 241 within 1 km Evidence: geographic proximity
- Neither count establishes a discharge · Facilities
What a 303(d) listing means
The Clean Water Act section 303(d) list names waters that do not meet water quality standards for one or more pollutants or stressors. California publishes it in the Integrated Report; this page shows the 2026 decisions from Appendix A as published.
- A listing describes the condition of the waterbody. It does not identify which sources cause the impairment, and it does not by itself place a requirement on any particular facility.
- Listed waters do not all have the same status. The Integrated Report category says how an impairment is being addressed: 5, a TMDL is required; 4a, addressed by a USEPA-approved TMDL; 4b, addressed by other pollution control requirements; 4c, impairment not caused by a pollutant. This waterbody's decisions are in category 5.
- TMDL requirement status values (such as 5A or 5B) are shown exactly as published in Appendix A.
2026 listing status Evidence: State-published
- On the 2026 303(d) list
- Yes
- Appendix A decisions
- 10
- Integrated Report category
- 5 (a TMDL is required)
- Listing cycle
- 2026
- State Board adoption
- 2026-02-03 (Resolution 2026-0005)
- USEPA approval
- not confirmed — submittal letter to USEPA published; no approval found on the report page (checked 2026-10-22)
- Regional Water Board
- 9 — San Diego
Published by the State Water Resources Control Board (2026 California Integrated Report, Appendix A). Listing status is taken from Appendix A only. A listing describes the condition of this waterbody, not of any facility.
Location
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Listing decisions and pollutants Evidence: State-published
Grouped by the Pollutant Category published in Appendix A. Pollutant names, categories and decisions are exactly as published.
Metals (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Selenium | Metals | 5 | Do Not Delist from 303(d) list (TMDL required list) | Revised | A Source Unknown | 111527 |
Nutrients (2 decisions)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Nitrogen | Nutrients | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 132041 |
| Phosphorus | Nutrients | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 111526 |
Other Cause (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Benthic Community Effects | Other Cause | 5 | Do Not Delist from 303(d) list (TMDL required list) | Revised | A Source Unknown Contaminated Sediments Hydromodification Illicit Connections/Illegal Hook-ups/Dry Weather Flows Unknown Point Source Urban Runoff/Storm Sewers | 126444 |
Pathogens (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Indicator Bacteria | Pathogens | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 127885 |
Pesticides (4 decisions)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Bifenthrin | Pesticides | 5 | Do Not Delist from 303(d) list (TMDL required list) | Revised | A Source Unknown | 111533 |
| Cyfluthrin | Pesticides | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 111539 |
| Cyhalothrin, Lambda | Pesticides | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 111541 |
| Pyrethroids | Pesticides | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 111532 |
Total Toxics (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Toxicity | Total Toxics | 5 | Do Not Delist from 303(d) list (TMDL required list) | Revised | A Source Unknown | 111529 |
TMDL information Evidence: State-published
| Pollutant | TMDL requirement status | TMDL project | Priority | USEPA approval of TMDL | Expected attainment |
|---|---|---|---|---|---|
| Benthic Community Effects | 5A | — | Low | — | — |
| Bifenthrin | 5A | — | Low | — | — |
| Cyfluthrin | 5A | — | Low | — | — |
| Cyhalothrin, Lambda | 5A | — | Low | — | — |
| Indicator Bacteria | 5A | — | Low | — | — |
| Nitrogen | 5A | — | Low | — | — |
| Phosphorus | 5A | — | Low | — | — |
| Pyrethroids | 5A | — | Low | — | — |
| Selenium | 5A | — | Low | — | — |
| Toxicity | 5A | — | Low | — | — |
This is TMDL information for the waterbody. It does not establish that a TMDL applies to any particular facility. Facility-specific TMDL requirements recorded in SMARTS appear on facility pages and are not linked to this waterbody until reviewed.
HUC12 watersheds
Published with the listing Evidence: publisher-reported
- Loma Alta Creek-Frontal Gulf of Santa Catalina 180703030504
Overlapping the waterbody's shape Evidence: spatial
- Loma Alta Creek-Frontal Gulf of Santa Catalina 180703030504 also published
Industrial stormwater facilities
Evidence: identification corroborated
Shows: the facility named this waterbody as its receiving water in SMARTS, and the name and the facility's location are consistent with it. Does not establish: a discharge pathway, a discharge of any pollutant, or a cause of the listing.
Evidence: geographic proximity
Shows: the facility's reported location is within 1 km of the waterbody's mapped shape. Does not establish: that the facility discharges to this waterbody, or any other relationship.
Report this waterbody as their receiving water Evidence: identification corroborated
| Facility | WDID | Status | Distance from reported location | Map |
|---|---|---|---|---|
| Superior Air Fabrication LLC DBA Superior Duct Fabrication | 9 37I031746 | Active | 20 m | map |
| Westlake Royal Roofing LLC | 9 37I029950 | Active | 36 m | map |
| CalPortland Company DBA Superior Oceanside Plant | 9 37I031588 | Active | 39 m | map |
| Willard Marine Inc | 9 37I030202 | Active | 56 m | map |
| Oceanside Ready Mix | 9 37I025321 | Active | 57 m | map |
| Summit Steel Inc | 9 37I031731 | Active | 60 m | map |
| Metro Roof Product | 9 37I017754 | Terminated | 67 m | map |
| Boral Roofing LLC | 9 37I029095 | Terminated | 67 m | map |
| CAMPBELL CERTIFIED INC | 9 37I026188 | Terminated | 68 m | map |
| U S Silica Oceanside Plant | 9 37I009229 | Terminated | 74 m | map |
| Greenfield Fence Inc | 9 37I026172 | Active | 74 m | map |
| Escondido Ready Mix | 9 37I005165 | Terminated | 77 m | map |
| Waste Management of North County | 9 37I025836 | Active | 78 m | map |
| Old School Iron Inc | 9 37I027156 | Active | 105 m | map |
| Oceanside Palomar Transit Mix | 9 37I005213 | Terminated | 122 m | map |
| Waste Management of North County | 9 37I001935 | Active | 135 m | map |
| Waste Management of North County | 9 37I001934 | Active | 139 m | map |
| JELD WEN inc | 9 37I026333 | Active | 142 m | map |
| Orco Block Co Inc | 9 37I004557 | Active | 146 m | map |
| Electronic Recycling Center | 9 37I024682 | Terminated | 188 m | map |
| Precision Design & Fabricating Inc | 9 37I025028 | Active | 198 m | map |
| Architectural Component Systems | 9 37I031226 | Active | 222 m | map |
| Simba Recycling | 9 37I025048 | Terminated | 258 m | map |
| Thornton Technology | 9 37NEC006629 | Terminated | 289 m | map |
| Ace Welding And Fabrication Inc | 9 37I028453 | Active | 313 m | map |
| La Salina WWTP | 9 37I005759 | Active | 347 m | map |
| El Corazon Compost Facility | 9 37I030482 | Active | 399 m | map |
| Acushnet Co Oceanside Test Fac | 9 37I014925 | Terminated | 457 m | map |
| Lee Steel Supply Co Inc | 9 37I019401 | Terminated | 541 m | map |
| Gilead Sciences Inc | 9 37I026694 | Terminated | 562 m | map |
| Gilead Sciences Inc | 9 37NEC003626 | Active | 562 m | map |
| Gilead Sciences Inc | 9 37I023339 | Terminated | 564 m | map |
| Magnaflow | 9 37I027206 | Active | 601 m | map |
| American Laser Fabrication | 9 37I031243 | Active | 726 m | map |
| Lees Iron and Metal | 9 37I004016 | Terminated | 732 m | map |
| Lees Metal Recycling LP | 9 37I027025 | Active | 732 m | map |
| Suja Life LLC | 9 37I027396 | Active | 804 m | map |
| Suja Life LLC | 9 37NEC002900 | Terminated | 804 m | map |
| Genentech Inc Oceanside | 9 37I019668 | Active | 829 m | map |
| Car Sound Exhaust Inc | 9 37NEC003289 | Active | 965 m | map |
| BCI Coca Cola Bottling Company of LA | 9 37I020958 | Terminated | 971 m | map |
| A Light | 9 37I030848 | Active | 1.1 km | map |
| A Light | 9 37NEC006564 | Terminated | 1.1 km | map |
| Douglas Technologies Group Inc | 9 37I025308 | Terminated | 1.2 km | map |
| Oceanside City Maxson Landfill | 9 37I005695 | Terminated | 1.3 km | map |
| Federal Express ZOCE | 9 37I026806 | Active | 1.3 km | map |
Receiving water reported by facility — waterbody identification corroborated by geographic evidence. 46 facilities.
Within 1 km of a facility's reported location Evidence: geographic proximity
Spatial proximity only; discharge pathway not established. Being near this waterbody does not mean a facility discharges to it.
| Facility | WDID | Status | Distance | Map |
|---|---|---|---|---|
| Marsway Inc | 9 37NEC007113 | Active | 104 m | map |
| Bravo Bells LLC | 9 37NEC007788 | Terminated | 104 m | map |
| Old School Iron Inc | 9 37I027156 | Active | 105 m | map |
| Nascential Art | 9 37NNA002957 | NONA Submitted | 116 m | map |
| EK Print INC | 9 37NEC010640 | Active | 119 m | map |
| AM Chemicals | 9 37NEC009425 | Terminated | 121 m | map |
| Oceanside Palomar Transit Mix | 9 37I005213 | Terminated | 122 m | map |
| Manji | 9 37NEC014457 | Active | 133 m | map |
| Mclaren Fabrication LLC | 9 37NEC014876 | Active | 134 m | map |
| LEGACY MACHINING METHODS INC | 9 37NEC006321 | Active | 134 m | map |
| Building 2 624 Garrison | 9 37NEC011344 | Active | 135 m | map |
| Waste Management of North County | 9 37I001935 | Active | 135 m | map |
| B and J Rubber Products LLC | 9 37NEC006254 | Active | 137 m | map |
| Integrated Fabrication | 9 37NEC011600 | Active | 137 m | map |
| Lefan Capsule International | 9 37NEC012471 | Active | 137 m | map |
| Avila Surfboards | 9 37NEC006898 | Active | 138 m | map |
| Twisted Burl Woodshop | 9 37NEC010351 | Active | 138 m | map |
| Waste Management of North County | 9 37I001934 | Active | 139 m | map |
| JELD WEN inc | 9 37I026333 | Active | 142 m | map |
| Jade Dior LLC | 9 37NEC011699 | Terminated | 142 m | map |
| Whitlock Industries Inc | 9 37NEC008008 | Active | 143 m | map |
| Oceanside Distillers | 9 37NEC008981 | Active | 143 m | map |
| Jo European Design | 9 37NEC013474 | Active | 144 m | map |
| Manzos Metal Works | 9 37NEC006386 | Active | 144 m | map |
| Kailani Surfboards | 9 37NEC007895 | Active | 144 m | map |
| Suntiger Industries LLC | 9 37NEC014251 | Active | 144 m | map |
| Sadie Rose Baking Company | 9 37NEC008471 | Active | 145 m | map |
| Orco Block Co Inc | 9 37I004557 | Active | 146 m | map |
| knock on wood | 9 37NEC010720 | Terminated | 146 m | map |
| AVS Fabrication Inc | 9 37NEC008370 | Terminated | 147 m | map |
| machine tech racing engines | 9 37NEC008687 | Active | 148 m | map |
| Turn Key Powertrain Inc | 9 37NEC006490 | Active | 158 m | map |
| R Zamora Corporation | 9 37NEC008215 | Terminated | 159 m | map |
| Pacific Gyre | 9 37NEC010396 | Active | 160 m | map |
| Straight Six Group | 9 37NEC005782 | Active | 162 m | map |
| Shop | 9 37NEC008929 | Terminated | 163 m | map |
| INT Softboards | 9 37NEC007944 | Active | 170 m | map |
| Cotton Patch | 9 37NEC010496 | Active | 170 m | map |
| CNC Precision | 9 37NEC011841 | Active | 172 m | map |
| Ederra Corp | 9 37NEC013596 | Active | 175 m | map |
| Salis International Inc | 9 37NEC008903 | Active | 175 m | map |
| Trinity Woodworks Inc | 9 37NEC005873 | Terminated | 179 m | map |
| Trinity Woodworks Inc | 9 37NEC007628 | Terminated | 179 m | map |
| Trinity Woodworks Inc | 9 37NEC010030 | Terminated | 179 m | map |
| Briles Rivet Corp | 9 37I009959 | Terminated | 183 m | map |
| Allfast Fastening Systems Inc | 9 37I015414 | Terminated | 183 m | map |
| oceanside ale works | 9 37NEC006998 | Active | 186 m | map |
| Electronic Recycling Center | 9 37I024682 | Terminated | 188 m | map |
| Shinoda LLC | 9 37NEC014722 | Active | 191 m | map |
| Continental Machining & Tools | 9 37NEC009168 | Active | 192 m | map |
Sources and provenance
| Information | Source | Retrieved |
|---|---|---|
| Watershed Boundary Dataset HU2 GeoPackages 15, 16, 18 (WBDHU12) | USGS | 2026-10-22 |
| 2026 California Integrated Report, Appendix A: 2026 303(d) List (final) | SWRCB | 2026-10-22 |
| Final_2026_Rivers_and_Streams + Final_2026_Lakes_and_Reservoirs (FeatureServer 0) | SWRCB GIS | 2026-10-22 |
| SMARTS TMDL requirements | SMARTS | 2026-10-21 |
Relationships computed 2026-10-22 (facility_huc12/1, proximity/1, receiving_water/2, tmdl_reference/1, waterbody_huc12_ovl/1, waterbody_huc12_pub/1).
Integrated Report categories: 5, a TMDL is required; 4a, addressed by a USEPA-approved TMDL; 4b, addressed by other pollution control requirements; 4c, impairment not caused by a pollutant.