San Luis Rey River, Lower (west of Interstate 15)

2026 303(d) list Waterbody ID CAR9031100020011005104327 River & Stream Region 9 · San Diego

At a glance

2026 listing Evidence: State-published: On the 2026 303(d) list · 9 Appendix A decisions; Category 5: a TMDL is required; What a listing means
Pollutants and stressors: 9 pollutants in 5 Appendix A categories; Nutrients (3) · Other Cause (1) · Pesticides (2) · SALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES (2) · Total Toxics (1); Listing decisions
TMDL information Evidence: State-published: 9 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: 0 report it as their receiving water Evidence: identification corroborated; 108 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: 9
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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Open this area on the statewide map · Browse impaired waters

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.

Nutrients (3 decisions)

Nutrients: Appendix A decisions
Pollutant	Pollutant category	Category	Final listing decision	Decision status	Sources	Decision ID
Nitrogen	Nutrients	5	Do Not Delist from 303(d) list (TMDL required list)	Revised	A Source Unknown	148398
Oxygen, Dissolved	Nutrients	5	Do Not Delist from 303(d) list (TMDL required list)	Revised	A Source Unknown	148304
Phosphorus	Nutrients	5	Do Not Delist from 303(d) list (TMDL required list)	Revised	A Source Unknown	148307

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	126463

Pesticides (2 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	111498
Pyrethroids	Pesticides	5	List on 303(d) list (TMDL required list)	Revised	A Source Unknown	111496

SALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES (2 decisions)

SALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES: Appendix A decisions
Pollutant	Pollutant category	Category	Final listing decision	Decision status	Sources	Decision ID
Chloride	SALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES	5	Do Not Delist from 303(d) list (TMDL required list)	Revised	A Source Unknown	148295
Total Dissolved Solids	SALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES	5	Do Not Delist from 303(d) list (TMDL required list)	Revised	A Source Unknown	148310

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	148311

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	—	—
Chloride	5A	—	Low	—	—
Nitrogen	5A	—	Low	—	—
Oxygen, Dissolved	5A	—	Low	—	—
Phosphorus	5A	—	Low	—	—
Pyrethroids	5A	—	Low	—	—
Total Dissolved Solids	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

None published.

Overlapping the waterbody's shape Evidence: spatial

Hellers Bend-San Luis Rey River 180703030302
Guajome Lake-San Luis Rey River 180703030304

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

No facility's reported receiving water is identified as this waterbody.

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
San Luis Rey WWTP	9 37I005757	Active	45 m	map
AIM Recycling	9 37I027278	Active	66 m	map
ACAR Oceanside yard	9 37I031733	Active	66 m	map
American Recycling International dba LKQ Pick Your Part Oceanside	9 37I025963	Terminated	119 m	map
Holliday Rock Co Inc	9 37I031690	Active	122 m	map
Oceanside Ready Mix	9 37I029877	Terminated	147 m	map
Bonsall Sch Dist	9 37I001391	Terminated	201 m	map
Deutsch Engineered	9 37I001664	Terminated	331 m	map
Regenesis	9 37NEC006698	Terminated	337 m	map
TE Connectivity	9 37I020425	Terminated	339 m	map
Precision Label Inc	9 37NEC006390	Active	344 m	map
FutureStitch Factory	9 37NEC011869	Active	354 m	map
San Diego Northern Railway	9 37I010316	Terminated	369 m	map
APMFG Fabricators Inc	9 37NEC009593	Terminated	390 m	map
Ecology Auto Wrecking	9 37I013069	Terminated	397 m	map
American Recycling International dba LKQ Pick Your Part Oceanside	9 37I025964	Terminated	397 m	map
Sabra Processing Facility Oceanside	9 37I026946	Terminated	416 m	map
Oceanside Salsa Facility Pacifica Foods	9 37I027975	Terminated	429 m	map
La Cabana Food Distributing Incorporated	9 37NEC013942	Active	429 m	map
Procast Inc	9 37NEC010104	Terminated	437 m	map
KDG Aviation LLC	9 37I029435	Active	459 m	map
El Corazon Compost Facility	9 37I011577	Terminated	468 m	map
Nelgo	9 37NEC012204	Terminated	471 m	map
Unique Metal Products Incorporated	9 37NEC008668	Terminated	477 m	map
Nelgo	9 37NEC012205	Active	477 m	map
Kik Tech Inc	9 37I016215	Terminated	505 m	map
Ecology Auto Parts Inc	9 37I025070	Terminated	514 m	map
Gallants Truck Salvage	9 37I013145	Terminated	517 m	map
Ecology Auto Wrecking	9 37I013223	Terminated	519 m	map
A 1 Auto Dismantling LLC	9 37I013219	Terminated	520 m	map
All Foreign All Gm	9 37I013177	Terminated	521 m	map
Lamb Screen Printing Inc	9 37NEC008257	Terminated	522 m	map
230 Warehousing	9 37NNA003245	NONA Submitted	526 m	map
Oceanside RMC Plant	9 37I019438	Terminated	527 m	map
First Transit Inc #55855	9 37I021854	Terminated	542 m	map
Balda Precision	9 37NEC007418	Active	546 m	map
ACE AVIATION SERVICE INC	9 37NEC010897	Active	547 m	map
Spring Water of San Diego, LLC, dba Blu Bulk Delivery	9 37NNA002330	NONA Submitted	550 m	map
Tipping Pint Brewing Co	9 37NEC013142	Active	551 m	map
Carruth Cellars LLC	9 37NEC010870	Active	560 m	map
Oceanside Municipal Airport	9 37I014012	Terminated	562 m	map
AIDM	9 37NEC009561	Terminated	563 m	map
Ajia Group Inc	9 37NEC013855	Active	563 m	map
STONE TRUSS	9 37NEC007697	Active	567 m	map
Paragon CNC	9 37NEC007620	Terminated	577 m	map
JBL Enterprises International	9 37NEC008835	Active	584 m	map
Palomar Water	9 37NEC007971	Terminated	591 m	map
Cem Tech	9 37NEC015704	Active	601 m	map
ROUGHHOUSE	9 37NEC008572	Terminated	604 m	map
323 Metal Works Inc	9 37NEC014737	Active	617 m	map

108 facilities, nearest first. Page 1 of 3: 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.