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
Regional Water Board: Region 9 · San Diego; River & Stream · Map
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)

Metals: Appendix A decisions
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)

Nutrients: Appendix A 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)

Other Cause: Appendix A decisions
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)

Pathogens: Appendix A decisions
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)

Pesticides: Appendix A 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)

Total Toxics: Appendix A decisions
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

TMDL information published for this waterbody
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

Facilities whose reported receiving water is identified as this waterbody
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.

Facilities whose reported location is within 1 km of this waterbody
Facility	WDID	Status	Distance	Map
Standard Filter Corporation	9 37NEC010050	Active	643 m	map
Dan Dresner Cabinetry Inc	9 37NEC011111	Active	647 m	map
RAVEON TECHNOLOGIES CORPORATION	9 37NEC014867	Active	668 m	map
Applied Composite Solutions Inc	9 37NEC010383	Active	683 m	map
Rich Limited	9 37NEC006519	Active	684 m	map
Square Up Fashions	9 37NEC009859	Active	688 m	map
Landmark Mfg Inc	9 37NEC007101	Active	708 m	map
American Laser Fabrication Inc	9 37NEC008054	Terminated	712 m	map
AVS FABRICATION Inc	9 37NEC015122	Active	718 m	map
American Laser Fabrication	9 37I031243	Active	726 m	map
Carbon by Design LP	9 37NEC000351	Terminated	726 m	map
Applied Composite Solutions inc	9 37NEC010389	Terminated	731 m	map
Lees Iron and Metal	9 37I004016	Terminated	732 m	map
Lees Metal Recycling LP	9 37I027025	Active	732 m	map
ROCUS USA CORP DBA NEON TECH INC	9 37NEC006762	Active	743 m	map
Dupaco Incorporated	9 37NEC007684	Active	781 m	map
DIG Corporation	9 37NEC015102	Terminated	789 m	map
Suja Life LLC	9 37I027396	Active	804 m	map
Suja Life LLC	9 37NEC002900	Terminated	804 m	map
Natures Supplements Inc	9 37NEC008937	Active	815 m	map
Genentech Inc Oceanside	9 37I019668	Active	829 m	map
Balda	9 37NEC006445	Terminated	842 m	map
Garden Botanika	9 37I014867	Terminated	856 m	map
Schroeder & Tremayne Inc	9 37I017608	Terminated	856 m	map
Colornote CA LLC	9 37IN600810	Undetermined	878 m	map
Belching Beaver Brewery	9 37NEC001964	Active	910 m	map
Belching Beaver Brewery	9 37NEC002041	Terminated	910 m	map
North Star Sensors LLC	9 37NEC008936	Active	911 m	map
Midwest Research Laboratories LLC	9 37NEC010418	Active	911 m	map
Trimco	9 37NEC006504	Active	916 m	map
Triangle Brass Mfg Co Inc	9 37NEC007471	Terminated	916 m	map
Lunada Bay Concrete	9 37NEC009621	Active	962 m	map
Foster Realty Group	9 37NEC014981	Active	962 m	map
Foster Realty Group	9 37NEC015470	Active	962 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
Reyes Coca Cola Bottling LLC	9 37I027420	Active	971 m	map
Nublocks	9 37NEC009189	Active	973 m	map
BDS Tactical Gear	9 37NEC009566	Active	981 m	map
Electro Mechanical Assembly Facility	9 37NEC008502	Active	990 m	map
S and B Precision Manufacturing	9 37NEC010303	Active	995 m	map

241 facilities, nearest first. Page 5 of 5: previous

Sources and provenance

Sources behind this page
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.