Marina del Rey Harbor

Waterbody ID (WBID): CAB4051700019990921120356
County / counties: Los Angeles
Regional Water Board: Regional Board 4 - Los Angeles Region
Waterbody type: Bay & Harbor
Condition category: Category 5 — 303(d) listed, TMDL required
Integrated Report cycle: 2026

303(d) listings (11)

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
alpha-Endosulfan (Endosulfan 1)Pesticides	135971	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ChlordanePesticides	135966	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Marina Del Rey Toxics (54)	—
CopperMetals	135969	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Marina Del Rey Toxics (54)	—
DDT (Dichlorodiphenyltrichloroethane)Pesticides	149723	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Marina Del Rey Toxics (54)	—
DieldrinPesticides	135976	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Marina Del Rey Toxics (54)	—
Indicator BacteriaPathogens	150311	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Marina del Rey Pathogens (46)	—
LeadMetals	135994	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Marina Del Rey Toxics (54)	—
Oxygen, DissolvedNutrients	94258	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
PCBs (Polychlorinated biphenyls)Toxic Organics	136013	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Marina Del Rey Toxics (54)	—
ToxicityTotal Toxics	68462	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Marina Del Rey Toxics (54)	—
ZincMetals	136023	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Marina Del Rey Toxics (54)	—

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: CAB4051700019990921120356
CALWNUM: 4404.610000, 4404.640000
WBD code: 180701040300, 180701040403
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: 52.95 Acres

Facilities with an NAL exceedance for a listed pollutant (13)

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

Active Recycling MRF and Transfer Station4 19I023130

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

Basic Fibers Inc4 19I001361

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

Basic Fibres IncWestern Metals4 19I019130

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

Blue Diamond Materials Inglewood4 19I015080

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

Boatyard4 19I020189

Lead, Zinc · most recent exceedance RY 2015 · association: derived nearby in watershed

Culver City City Refuse Transf4 19I001571

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

First Student Inc 204244 19I006379

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

Metro Division 54 19I000490

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

Metro Division 74 19I000492

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

Moldex Metric Inc4 19I021497

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

Scarrott Metallurigical Company4 19I024576

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

Southwest Plating4 19I003448

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

University of California Los Angeles4 19I005470

Copper, Zinc · most recent exceedance RY 2023 · 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

Active Recycling MRF and Transfer Station

Los Angeles · Notice of Intent

derived_watershed_association