California Stormwater Intelligence
← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Timber Canyon

Waterbody ID (WBID)
CAR4033100020110721225227
County / counties
Ventura
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 (7)

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
BifenthrinPesticides139229List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
ChlorpyrifosPesticides139207Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
CyfluthrinPesticides139238List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
CypermethrinPesticides139230List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
DDT (Dichlorodiphenyltrichloroethane)Pesticides149969List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
FenpropathrinPesticides139241List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
PyrethroidsPesticides139228List on 303(d) list (TMDL required list)Revised5A — 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
Sep 16, 2026, 10:57 PM UTC
Waterbody ID
CAR4033100020110721225227
CALWNUM
4403.31
WBD code
180701020902
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.

Loading map…
Watershed
—
Assessed size
6.1 Miles

Derived facility associations

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

Derived
Abrisa Industrial Glass

Santa Paula · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Aurora Casting Engineering

Santa Paula · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Automotive Racing Product Inc

Santa Paula · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Automotive Racing Product Inc

Santa Paula · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

AUTOMOTIVE RACING PRODUCTS

Santa Paula · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Baker Petrolite

Santa Paula · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Toland Road Landfill

Santa Paula · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Ward Corp

Santa Paula · Notice of Intent

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.