San Gabriel River Estuary

Waterbody ID (WBID): CAR4051600020000229163853
County / counties: Los Angeles, Orange
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 (7)

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
ChlordanePesticides	138354	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ChlorineToxic Inorganics	138355	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
CopperMetals	138362	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	San Gabriel River Metals (39)	—
DioxinToxic Organics	73163	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
Indicator BacteriaPathogens	150324	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	San Gabriel River Coliform (45)	—
NickelMetals	138400	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Oxygen, DissolvedNutrients	138410	Do Not Delist from 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: CAR4051600020000229163853
CALWNUM: 4405.15
WBD code: 180701060606, 180701060703
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: 3.41 Miles

Facilities with an NAL exceedance for a listed pollutant (17)

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

American Marine Corp4 19I021437

Copper · most recent exceedance RY 2016 · association: derived watershed association

BNSF Terminal Island4 19I019214

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

Bodycote Thermal Processing4 19I023136

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

Cavotec USA8 30I024632

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

Continental Heat Treating Inc4 19I000552

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

Fortune Metal Inc of RI4 19I024809

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

Heraeus Precious Metals North America LLC4 19I015954

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

Hyatt Die Casting8 30I000211

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

Marina Shipyard4 19I004977

Copper · most recent exceedance RY 2016 · association: derived receiving water

Miller Castings Inc4 19I022672

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

New Indy TriPAQ LLC4 19I028572

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

Philatron Wire Cable4 19I023391

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

Pier J Berths J243 to J247 J266 to J2704 19I025359

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

Pioneer Auto Wrecking4 19I018347

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

Santa Fe Auto Salvage4 19I001451

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

SSA Terminals4 19I025337

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

US Coast Guard Base LALB4 19I007310

Copper · most recent exceedance RY 2021 · 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

3C Delivery Corp

Santa Fe Springs · No Exposure Certification

derived_watershed_association