California Stormwater Intelligence
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Waterbody profile

Official Water Board record · 2026 cycle

Triunfo Canyon Creek Reach 2

Waterbody ID (WBID)
CAR4042400019990202082235
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 / stressorDecision IDFinal listing decisionDecision statusTMDL requirement statusTMDL projectTMDL priority
Benthic Community EffectsOther Cause151607Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLMalibu Lagoon Benthic Comm. Effects (71)—
LeadMetals137808Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
MercuryMetals69884List on 303(d) list (TMDL required list)Original5A — TMDL still required—Low
Sedimentation/SiltationSediment70316List on 303(d) list (TMDL required list)Original5A — 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
CAR4042400019990202082235
CALWNUM
4404.240000, 4404.250000
WBD code
180701040101
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
3.64 Miles

Derived facility associations

Industrial stormwater facilities geographically associated with this waterbody. These are derived spatial associations, not Water Board findings.

Derived
Crane Technology Company Incorporated

Westlake Village · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Elanen Naturals LLC

Westlake Village · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

First Sensor Inc

Westlake Village · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Moyer & Associates

Thousand Oaks · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Mrs Williams Country Kitchen

Westlake Village · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

PeproTech Inc a part of ThermoFisher

Thousand Oaks · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Rantec Microwave Systems Inc

Westlake Village · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

The Printing Press

Westlake Village · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

The Village Winery

Thousand Oaks · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Thousand Oaks Printing

Westlake Village · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Facility records are official Industrial General Permit registrations, but the association between a facility and this waterbody is derived geographically (proximity or shared HUC12 subwatershed) and is not a Water Board receiving-water determination. Where a permit carries a Water Board-stated TMDL requirement naming this water, it is listed separately above.