Rio Hondo Reach 1 (Confl. LA River to Snt Ana Fwy)
2026 303(d) list Waterbody ID CAR4051501019990202112624 River & Stream Region 4 · Los Angeles
At a glance
- 2026 listing Evidence: State-published
- On the 2026 303(d) list · 8 Appendix A decisions
- Category 5: a TMDL is required
- What a listing means
- Pollutants and stressors
- 8 pollutants in 6 Appendix A categories
- Metals (3) · Nuisance (1) · Other Cause (1) · Pathogens (1) · Total Toxics (1) · Trash (1)
- Listing decisions
- TMDL information Evidence: State-published
- 8 decisions with a TMDL requirement status; 6 name a TMDL project
- Status codes as published: 5A, 5B
- TMDL details
- Industrial stormwater facilities
- 0 report it as their receiving water Evidence: identification corroborated
- 201 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
- 8
- 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
- 4 — Los Angeles
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.
Metals (3 decisions)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Copper | Metals | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | Original | Nonpoint Source Point Source | 70760 |
| Lead | Metals | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | Original | Nonpoint Source Point Source | 69754 |
| Zinc | Metals | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | Revised | Nonpoint Source Point Source | 138336 |
Nuisance (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Oil and Grease | Nuisance | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 138335 |
Other Cause (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| pH | Other Cause | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | Original | Nonpoint Source Point Source | 68305 |
Pathogens (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Indicator Bacteria | Pathogens | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | Revised | A Source Unknown | 150321 |
Total Toxics (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Toxicity | Total Toxics | 5 | List on 303(d) list (TMDL required list) | Original | A Source Unknown | 69308 |
Trash (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Trash | Trash | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | Original | Nonpoint Source Surface Runoff Urban Runoff/Storm Sewers | 70258 |
TMDL information Evidence: State-published
| Pollutant | TMDL requirement status | TMDL project | Priority | USEPA approval of TMDL | Expected attainment |
|---|---|---|---|---|---|
| Copper | 5B | Los Angeles River Metals (13) | — | 2005-12-22 | — |
| Indicator Bacteria | 5B | Los Angeles River Pathogens (15) | — | 2012-03-23 | — |
| Lead | 5B | Los Angeles River Metals (13) | — | 2005-12-22 | — |
| Oil and Grease | 5A | — | Low | — | — |
| pH | 5B | Los Angeles River Nitrogen (11) | — | 2004-03-18 | — |
| Toxicity | 5A | — | Low | — | — |
| Trash | 5B | Los Angeles River Trash (12) | — | 2008-07-24 | — |
| Zinc | 5B | Los Angeles River Metals (13) | — | 2005-12-22 | — |
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
- Alhambra Wash-Rio Hondo 180701050303
- Compton Creek-Los Angeles River 180701050402
Overlapping the waterbody's shape Evidence: spatial
- Alhambra Wash-Rio Hondo 180701050303 also published
- Compton Creek-Los Angeles River 180701050402 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
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.
| Facility | WDID | Status | Distance | Map |
|---|---|---|---|---|
| KAIZEN LOGISTICS INC | 4 19NNA003382 | No Action Required | 692 m | map |
| Vinvale Marketing Terminal | 4 19I024234 | Active | 695 m | map |
| Techni Cast Corp | 4 19NEC012460 | Terminated | 696 m | map |
| SA Recycling LLC | 4 19I022414 | Terminated | 741 m | map |
| KRAFT BAG USA | 4 19NEC014751 | Active | 743 m | map |
| UPS Ground Freight CAPRI | 4 19I009474 | Terminated | 743 m | map |
| TForce Freight Pico Rivera | 4 19I029550 | Active | 743 m | map |
| GATX Logistics Inc | 4 19I010840 | Terminated | 750 m | map |
| Bimbo Bakeries USA Inc Montebello Sales Center | 4 19NEC008557 | Active | 772 m | map |
| Artsons Manufacturing Company Inc | 4 19I028488 | Active | 787 m | map |
| Granitize | 4 19I019718 | Active | 790 m | map |
| Senfeng Laser USA Inc | 4 19NEC008308 | Terminated | 791 m | map |
| Barrett Distribution Centers | 4 19NEC015726 | Active | 793 m | map |
| Source Logistics LLC | 4 19NEC005110 | Active | 804 m | map |
| Leggett & Platt Inc | 4 19I011751 | Terminated | 811 m | map |
| Angelus Precision Grinding | 4 19NEC005588 | Terminated | 819 m | map |
| Martinez Recycling Center 5 | 4 19NNA001335 | No Action Required | 829 m | map |
| Titan Industries | 4 19I003681 | Terminated | 833 m | map |
| Parker Hannifin Corporation | 4 19I022132 | Terminated | 833 m | map |
| Le Chef Bakery | 4 19NEC008745 | Active | 836 m | map |
| Western Fibre Products | 4 19NEC012491 | Active | 836 m | map |
| Lilly Industries Inc | 4 19I000617 | Terminated | 844 m | map |
| Lilly Industries Inc | 4 19I016192 | Terminated | 844 m | map |
| Valspar Industries Usa Inc | 4 19I016421 | Terminated | 844 m | map |
| Baiksan OPC Inc | 4 19NEC006026 | Terminated | 855 m | map |
| GLOBALEX LLC | 4 19NEC014320 | Active | 861 m | map |
| Edson Industries | 4 19I003148 | Terminated | 876 m | map |
| Techni Cast LLC | 4 19I031470 | Active | 877 m | map |
| South Gate City Salt Lake Tran | 4 19I011559 | Terminated | 882 m | map |
| Salas Lures | 4 19NEC016044 | Active | 885 m | map |
| Carr Pattern Co | 4 19I003970 | Terminated | 895 m | map |
| Cactus Botanics CA Inc | 4 19NEC015926 | Active | 899 m | map |
| Monarch Aluminum Casting Co | 4 19I012412 | Terminated | 902 m | map |
| Bell Foundry Co | 4 19I000045 | Terminated | 903 m | map |
| Bell Foundry Co | 4 19I018017 | Terminated | 903 m | map |
| Progressive Frame & Fabricating | 4 19I014225 | Terminated | 904 m | map |
| Advanced Pipe Prod LLC | 4 19I019302 | Terminated | 914 m | map |
| Van Brunt Foundry INC | 4 19NEC005694 | Active | 915 m | map |
| Alexander Land Clearing | 4 19I019322 | Terminated | 917 m | map |
| Neils Logistics | 4 19NEC016133 | Active | 918 m | map |
| Premco Forge Inc | 4 19I027926 | Active | 948 m | map |
| Jimco Inc | 4 19I029808 | Active | 952 m | map |
| Jimco Greenwood | 4 19NNA001671 | No Action Required | 956 m | map |
| A J Daw Printing | 4 19I000273 | Terminated | 958 m | map |
| Penske Logistics | 4 19I023842 | Terminated | 970 m | map |
| Machine Precision Components | 4 19NEC003235 | Terminated | 971 m | map |
| Techni Cast Corp | 4 19I001231 | Terminated | 971 m | map |
| LEGACY FRAMES | 4 19I029098 | Active | 980 m | map |
| Capitol Steel Fabricators Inc | 4 19I025689 | Terminated | 995 m | map |
| Capitol Steel Fabricators Inc | 4 19NEC000591 | Terminated | 995 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.