Tapo Canyon

Waterbody ID (WBID): CAR4034100020110722112902
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 (15)

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
BifenthrinPesticides	139323	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ChlordanePesticides	139296	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Calleguas Creek PCBs (7)	—
ChlorideSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES	139297	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Boron/Sulfate/TDS (4)	—
CypermethrinPesticides	139324	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
DDD (Dichlorodiphenyldichloroethane)Pesticides	97032	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
DDE (Dichlorodiphenyldichloroethylene)Pesticides	99701	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
DDT (Dichlorodiphenyltrichloroethane)Pesticides	149961	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
FenpropathrinPesticides	139335	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Indicator BacteriaPathogens	150713	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Nitrogen, NitrateNutrients	149962	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
PermethrinPesticides	139339	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
PyrethroidsPesticides	139322	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
SulfatesToxic Inorganics	97386	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
Total Dissolved SolidsSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES	97445	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
ToxicityTotal Toxics	97447	List on 303(d) list (TMDL required list)	Original	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: Sep 16, 2026, 10:57 PM UTC
Waterbody ID: CAR4034100020110722112902
CALWNUM: 4403.41
WBD code: 180701020403
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: 4.12 Miles

Derived facility associations

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

Derived

A&M Electronics

Valencia · No Exposure Certification

derived_watershed_association