Waterbody profile

Official Water Board record · 2026 cycle

Rio Hondo Reach 3 (above Spreading Grounds)

Waterbody ID (WBID): CAR4053100020110601150056
County / counties: Los Angeles
Regional Water Board: Regional Board 4 - Los Angeles Region
Waterbody type: River & Stream
Condition category: Category 5 — 303(d) listed, TMDL required
Integrated Report cycle: 2026

303(d) listings (5)

Each row is one official listing decision from Appendix A of the Final 2026 California Integrated Report. Source terminology is preserved as published.

Pollutant / stressor	Decision ID	Final listing decision	Decision status	TMDL requirement status	TMDL project	TMDL priority
CopperMetals	139804	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Indicator BacteriaPathogens	150322	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Los Angeles River Pathogens (15)	—
IronMetals	139813	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Oxygen, DissolvedNutrients	151936	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ZincMetals	139836	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low

Source & provenance

Agency: California State Water Resources Control Board
Report: Final 2026 California Integrated Report
Dataset: Appendix A — 2026 303(d) List of Impaired Waters
Imported: Aug 21, 2026, 12:44 AM UTC
Waterbody ID: CAR4053100020110601150056
CALWNUM: 4412.31
WBD code: 180701050301, 180701050302, 180701050303
Geometry: Official Water Board GIS (CA_WATERBOARDS_GIS_FINAL_2026)

View official Water Board fact sheet ↗Download Appendix A source file ↗

Location

Official 2026 Water Board geometry. Demonstration facility markers are shown for context only.

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Watershed: —
Assessed size: 8.07 Miles

Facilities with an NAL exceedance for a listed pollutant (60)

Geographically associated industrial stormwater facilities whose reported results exceeded an Industrial General Permit Numeric Action Level for a pollutant this waterbody is listed for.

Derived

3M Company4 19I002054

Zinc · most recent exceedance RY 2017 · association: derived watershed association

3M Monrovia Oral Care4 19I001198

Copper, Zinc · most recent exceedance RY 2017 · association: derived watershed association

750 Recyclers4 19I028928

Iron, Zinc · most recent exceedance RY 2020 · association: derived watershed association

Accurate Steel4 19I009388

Zinc · most recent exceedance RY 2024 · association: derived watershed association

Al Mag Heat Treat4 19I021973

Zinc · most recent exceedance RY 2021 · association: derived watershed association

All California Truck Auto Salvage4 19I020190

Iron, Zinc · most recent exceedance RY 2021 · association: derived watershed association

Alpha Auto Dismantling4 19I029062

Zinc · most recent exceedance RY 2020 · association: derived watershed association

Alum A Coat4 19I029501

Copper, Iron, Zinc · most recent exceedance RY 2022 · association: derived watershed association

Ametek Hermetic Seal4 19I011199

Iron, Zinc · most recent exceedance RY 2025 · association: derived watershed association

Box Express Mfg4 19I029151

Copper · most recent exceedance RY 2021 · association: derived watershed association

Burnett and Son Meat Company Incorporated4 19I027661

Zinc · most recent exceedance RY 2018 · association: derived watershed association

Cascade Steel Rolling Mills Inc4 19I004254

Copper, Iron, Zinc · most recent exceedance RY 2025 · association: derived watershed association

Dave S Auto Truck Dismantlin4 19I001717

Iron, Zinc · most recent exceedance RY 2018 · association: derived watershed association

De La Huerta Auto Parts4 19I010111

Iron · most recent exceedance RY 2019 · association: derived watershed association

Duarte Auto Wrecking4 19I020452

Iron, Zinc · most recent exceedance RY 2025 · association: derived watershed association

F A S T Inc4 19I009284

Iron, Zinc · most recent exceedance RY 2017 · association: derived watershed association

First Transit Inc 572314 19I019685

Copper, Zinc · most recent exceedance RY 2022 · association: derived watershed association

Garfay Auto Sales Parts4 19I025274

Zinc · most recent exceedance RY 2019 · association: derived watershed association

GWS Inc4 19I025256

Iron · most recent exceedance RY 2022 · association: derived watershed association

Halcore Group Inc Leader Industries4 19I021967

Iron · most recent exceedance RY 2025 · association: derived watershed association

HK Auto Salvage4 19I023868

Copper · most recent exceedance RY 2025 · association: derived watershed association

Industrial Lead Construction Inc4 19I028377

Iron, Zinc · most recent exceedance RY 2020 · association: derived watershed association

J B Hunt Trans Inc4 19I009085

Zinc · most recent exceedance RY 2019 · association: derived watershed association

J P Turgeon Sons4 19I004413

Zinc · most recent exceedance RY 2017 · association: derived watershed association

JB Hunt Transport Inc Pico Rivera Terminal4 19I030069

Zinc · most recent exceedance RY 2025 · association: derived watershed association

Jenco Plating Inc4 19I001469

Iron · most recent exceedance RY 2015 · association: derived nearby in watershed

Jimco Inc4 19I029808

Iron, Zinc · most recent exceedance RY 2022 · association: derived watershed association

Kin Ming Co USA4 19I029458

Copper, Iron · most recent exceedance RY 2022 · association: derived watershed association

LKQ Pick A Part4 19I010791

Copper, Iron, Zinc · most recent exceedance RY 2025 · association: derived nearby in watershed

LPD II Auto Wrecking4 19I010302

Iron · most recent exceedance RY 2025 · association: derived watershed association

Lunday Thagard Company DBA World Oil Refining4 19I003169

Copper, Zinc · most recent exceedance RY 2017 · association: derived watershed association

Lunday Thagard Company Dba World Oil Refining4 19I003170

Copper, Iron, Zinc · most recent exceedance RY 2025 · association: derived watershed association

Materia Inc4 19I026213

Iron · most recent exceedance RY 2018 · association: derived watershed association

Materia Inc4 19I026215

Iron · most recent exceedance RY 2015 · association: derived watershed association

Metal Surfaces4 19I001684

Zinc · most recent exceedance RY 2024 · association: derived watershed association

Metro Division 94 19I000494

Copper, Zinc · most recent exceedance RY 2021 · association: derived nearby in watershed

Mulgrew Aircraft Components Inc4 19I029201

Zinc · most recent exceedance RY 2024 · association: derived watershed association

My Auto Wrecking4 19I022420

Copper, Iron, Zinc · most recent exceedance RY 2021 · association: derived watershed association

Ochoa Group Corporation4 19I026983

Zinc · most recent exceedance RY 2025 · association: derived watershed association

P T Metals4 19I023593

Copper, Iron, Zinc · most recent exceedance RY 2022 · association: derived watershed association

P V Auto Dismantling Inc4 19I012245

Iron, Zinc · most recent exceedance RY 2020 · association: derived watershed association

Pasadena Water Power4 19I000994

Copper, Iron, Zinc · most recent exceedance RY 2025 · association: derived watershed association

Relton Corporation4 19I026972

Iron, Zinc · most recent exceedance RY 2016 · association: derived watershed association

Robertsons Ready Mix Irwindale4 19I011163

Iron · most recent exceedance RY 2018 · association: derived watershed association

Russ Recycling4 19I018559

Zinc · most recent exceedance RY 2018 · association: derived watershed association

S J Auto4 19I024928

Iron, Zinc · most recent exceedance RY 2018 · association: derived watershed association

SA Recycling4 19I021107

Copper, Iron, Zinc · most recent exceedance RY 2019 · association: derived watershed association

SA Recycling4 19I022544

Copper, Iron, Zinc · most recent exceedance RY 2025 · association: derived watershed association

SA Recycling LLC4 19I029307

Iron, Zinc · most recent exceedance RY 2025 · association: derived watershed association

Schneider National Carriers Inc4 19I023306

Copper, Zinc · most recent exceedance RY 2021 · association: derived nearby in watershed

South El Monte Auto Salvage4 19I003687

Copper, Iron, Zinc · most recent exceedance RY 2025 · association: derived watershed association

South Gate Transfer Station4 19I006188

Copper, Iron, Zinc · most recent exceedance RY 2025 · association: derived watershed association

Spragues Ready Mix4 19I002348

Iron · most recent exceedance RY 2024 · association: derived watershed association

Tat Auto Dismantler4 19I013800

Copper, Iron, Zinc · most recent exceedance RY 2021 · association: derived watershed association

Ted Levine Drum Co4 19I002754

Iron, Zinc · most recent exceedance RY 2022 · association: derived watershed association

The Precision Coil Spring Co4 19I003473

Iron, Zinc · most recent exceedance RY 2024 · association: derived nearby in watershed

THRIFTY ICE CREAM4 19I003425

Zinc · most recent exceedance RY 2023 · association: derived nearby in watershed

TP Auto Dismantler Inc4 19I029759

Iron · most recent exceedance RY 2023 · association: derived watershed association

United Rock Products4 19I000779

Iron · most recent exceedance RY 2020 · association: derived watershed association

Vacco Industries4 19I002969

Copper, Iron, Zinc · most recent exceedance RY 2024 · association: derived watershed association

This is derived co-occurrence between a calculated NAL comparison and the official 303(d) listing for this waterbody. An NAL exceedance triggers Exceedance Response Actions under the permit; it is not a violation and does not establish that any facility caused or contributed to this impairment.

Derived facility associations

Industrial stormwater facilities geographically associated with this waterbody. These are derived spatial associations, not Water Board findings.

Derived

10 Roads Express LLC

Montebello · Notice of Intent

derived_watershed_association