San Gabriel River Reach 1 (Estuary to Firestone)

Waterbody ID (WBID): CAR4051501019980917144356
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 (3)

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
Indicator BacteriaPathogens	150325	List on 303(d) list (being addressed by USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	San Gabriel River Coliform (45)	—
Oil and GreaseNuisance	138232	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
pHOther Cause	138236	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: CAR4051501019980917144356
CALWNUM: 4405.15
WBD code: 180701060606
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: 6.35 Miles

Facilities with an NAL exceedance for a listed pollutant (11)

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

Albert Industries LTD dba Superior Handforge4 19I027137

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

Bellflower Recycling Center4 19I029551

pH · most recent exceedance RY 2024 · association: derived receiving water

CA Army National Guard Los Alamitos8 30I013435

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

Damco Distribution Services Inc4 19I029159

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

Einstein Noah Restaurant Group4 19I021489

Oil and Grease · most recent exceedance RY 2017 · association: derived watershed association

Hyatt Die Casting8 30I000211

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

JC Grinding Incorporated4 19I027877

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

Long Beach Water Reclamation Plant4 19I010348

pH · most recent exceedance RY 2019 · association: derived nearby in watershed

Los Alamitos Unified School District8 30I004054

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

Puente Hills Materials Recovery Facility4 19I019265

Oil and Grease, pH · most recent exceedance RY 2018 · association: derived watershed association

Sun Chemical4 19I018246

pH · most recent exceedance RY 2025 · 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

1959

Los Angeles · No Exposure Certification

derived_watershed_association