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
Becton Dickinson	9 37I018804	Terminated	331 m	map
Greene Group Industries	9 37I031409	Active	336 m	map
Greene Intl West Inc	9 37I001512	Terminated	336 m	map
National Metal Technologies	9 37I015010	Terminated	336 m	map
Sadlerstone LLC	9 37NNA002969	NONA Submitted	336 m	map
Biogen Idec Inc	9 37I018363	Terminated	337 m	map
NDK PARAGON	9 37NEC007274	Active	344 m	map
La Salina WWTP	9 37I005759	Active	347 m	map
KINETIC COMPOSITES INC	9 37NEC009073	Active	357 m	map
AMFLEX PLASTICS INC	9 37NEC008514	Active	362 m	map
R&G Precision 1	9 37NEC010411	Active	363 m	map
Metal Lighthouse Incorporated	9 37NEC009981	Active	364 m	map
Hi Tech Electronic Manufacturing Corp	9 37NEC010979	Active	387 m	map
Masa Tool Inc	9 37NEC007772	Active	394 m	map
Elite Metal Finishing	9 37I025956	Active	395 m	map
Superior Machined Products Inc	9 37NEC008826	Active	397 m	map
El Corazon Compost Facility	9 37I030482	Active	399 m	map
El Corazon Reclamation and Recycling	9 37I029107	Active	401 m	map
Duchess and Fox Inc	9 37NEC009005	Terminated	406 m	map
Lamvin	9 37NEC015276	Active	434 m	map
Kinetics Noise Control	9 37NEC008315	Active	442 m	map
Acushnet Co Oceanside Test Fac	9 37I014925	Terminated	457 m	map
3G Shielding Specialties LLC	9 37NEC014145	Active	462 m	map
whiskey yankee llc	9 37NEC010239	Active	468 m	map
L3 Unidyne Oceanside	9 37NEC001848	Terminated	476 m	map
Sumix Oceanside	9 37NEC009266	Active	476 m	map
Hexagon Manufacturing Intelligence Inc	9 37NEC010830	Active	476 m	map
Westside Merchandising LLC	9 37NEC014050	Active	476 m	map
KAPAN KENT COMPANY INCORPORATED	9 37NEC008401	Terminated	490 m	map
Artience Lighting Inc	9 37NEC008288	Terminated	499 m	map
Edge Tech Manufacturing Inc	9 37NEC010874	Active	500 m	map
CNC Precision Machining	9 37IN601948	Undetermined	507 m	map
Impact Design	9 37NEC014891	Active	514 m	map
Lee Steel Supply Co Inc	9 37I019401	Terminated	541 m	map
St Moritz Bakery Inc	9 37NEC008319	Terminated	543 m	map
Leon Flour Tortillas LLC	9 37NEC013276	Active	545 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
Genentech Inc	9 37I020123	Terminated	567 m	map
Hobie Cat	9 37I012679	Active	569 m	map
Tri City Crating & Packing	9 37NEC008091	Active	576 m	map
Elmec Mfg Inc	9 37NEC007719	Active	580 m	map
Magnaflow	9 37I027206	Active	601 m	map
Mulberry Distilling Co	9 37NEC013381	Terminated	602 m	map
Solecta Inc	9 37NEC005619	Active	603 m	map
Solecta Inc	9 37NEC015266	Active	603 m	map
Solution Box Inc	9 37NEC016092	Active	630 m	map
Biogen Idec Inc	9 37I017431	Terminated	637 m	map
VacuClamp	9 37NEC011052	Active	638 m	map

241 facilities, nearest first. Page 4 of 5: previous next

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.