Colorado Lagoon

Waterbody ID (WBID): CAT4051200020000229133322
County / counties: Los Angeles
Regional Water Board: Regional Board 4 - Los Angeles Region
Waterbody type: Wetland, Tidal
Condition category: Category 4a — TMDL completed
Integrated Report cycle: 2026

303(d) listings (9)

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	138889	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Colorado Lagoon Pesticides, PAH's, PCB, Metals etc TMDL (82 & 83)	—
DDT (Dichlorodiphenyltrichloroethane)Pesticides	149515	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Colorado Lagoon Pesticides, PAH's, PCB, Metals etc TMDL (82 & 83)	—
DieldrinPesticides	138892	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Colorado Lagoon Pesticides, PAH's, PCB, Metals etc TMDL (82 & 83)	—
Indicator BacteriaPathogens	171743	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Los Cerritos Channel and Estuary, Alamitos Bay, and Colorado Lagoon Indicator Bacteria TMDL	—
LeadMetals	98804	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Colorado Lagoon Pesticides, PAH's, PCB, Metals etc TMDL (82 & 83)	—
PAHs (Polycyclic Aromatic Hydrocarbons)Toxic Organics	149512	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Colorado Lagoon Pesticides, PAH's, PCB, Metals etc TMDL (82 & 83)	—
PCBs (Polychlorinated biphenyls)Toxic Organics	138898	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Colorado Lagoon Pesticides, PAH's, PCB, Metals etc TMDL (82 & 83)	—
ToxicityTotal Toxics	138900	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Colorado Lagoon Pesticides, PAH's, PCB, Metals etc TMDL (82 & 83)	—
ZincMetals	70915	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Colorado Lagoon Pesticides, PAH's, PCB, Metals etc TMDL (82 & 83)	—

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: CAT4051200020000229133322
CALWNUM: 4405.15
WBD code: 180701060702
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: 16.67 Acres

Facilities with an NAL exceedance for a listed pollutant (14)

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

AltAir Paramount Facility4 19I027557

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

Astro Pak Corporation4 19I002927

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

Certified Alloy Products Inc4 19I005554

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

Downey4 19I028471

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

Haynes Generating Station4 19I019059

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

Keystone Engineering Company4 19I000310

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

M D Stainless Services Inc4 19I018712

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

Paramount Metals and Supply Co4 19I027167

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

Pico Rivera Plating Inc4 19I004295

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

Quik Shor4 19I026926

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

Ship and Shore Environmental Inc4 19I028525

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

Tabc Inc4 19I003517

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

Universal Molding Extrusion Co4 19I013881

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

Wyatt Precision Machine Inc4 19I028490

Zinc · 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

ABF Freight System Inc

Pico Rivera · No Exposure Certification

derived_watershed_association