Clark Channel

Waterbody ID (WBID): CAR4051500020210324044688
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 (4)

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
AluminumMetals	153962	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
CopperMetals	140087	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Indicator BacteriaPathogens	150797	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Oil and GreaseNuisance	140091	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: CAR4051500020210324044688
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: 6.37 Miles

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

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

Astro Pak Corporation4 19I002927

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

Certified Alloy Products Inc4 19I005554

Aluminum, Copper, Oil and Grease · most recent exceedance RY 2023 · association: derived watershed association

Downey4 19I028471

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

Evoqua Water Technologies LLC4 19I028339

Oil and Grease · most recent exceedance RY 2022 · association: derived watershed association

Marina Shipyard4 19I004977

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

Paramount Metals and Supply Co4 19I027167

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

Pico Rivera Plating Inc4 19I004295

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

PT Industries Inc4 19I028473

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

Quik Shor4 19I026926

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

Ship and Shore Environmental Inc4 19I028525

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

Universal Molding Extrusion Co4 19I013881

Aluminum, Copper, Oil and Grease · most recent exceedance RY 2020 · association: derived watershed association

Virgin Orbit LLC4 19I027148

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

Wyatt Precision Machine Inc4 19I028490

Aluminum · 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

Aircraft Hardware West a division of Clarendon Specialty Fasteners Inc

Long Beach · No Exposure Certification

derived_watershed_association