Calleguas Creek Reach 1

Waterbody ID (WBID): CAE4031300020000229155722
County / counties: Ventura
Regional Water Board: Regional Board 4 - Los Angeles Region
Waterbody type: Estuary
Condition category: Category 4a — TMDL completed
Integrated Report cycle: 2026

303(d) listings (14)

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	136108	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Historic Pesticides (5)	—
Chlordane (tissue)Pesticides	70032	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Historic Pesticides (5)	—
CopperMetals	136110	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Metals (6)	—
DDT (tissue & sediment)Pesticides	74185	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Historic Pesticides (5)	—
DieldrinPesticides	69060	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Historic Pesticides (5)	—
Endosulfan (tissue)Pesticides	69197	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Historic Pesticides (5)	—
MercuryMetals	149452	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Metals (6)	—
NickelMetals	69359	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Metals (6)	—
NitrogenNutrients	68523	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Nitrogen (1)	—
PCBs (Polychlorinated biphenyls)Toxic Organics	136114	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Calleguas Creek PCBs (7)	—
PCBs (Polychlorinated biphenyls) (tissue)Toxic Organics	99584	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek PCBs (7)	—
Sedimentation/SiltationSediment	75097	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Trash (9)	—
ToxaphenePesticides	74834	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Historic Pesticides (5)	—
ToxicityTotal Toxics	69560	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Historic Pesticides (5)	—

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: CAE4031300020000229155722
CALWNUM: 4408.110000, 4408.130000
WBD code: 180701030201
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: 46.71 Acres

Facilities with an NAL exceedance for a listed pollutant (4)

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

540 Spectrum Cr4 56I027790

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

Del Norte Regional MRF4 56I024943

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

Mercury Systems4 56I030103

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

SA Recycling4 56I023382

Copper · most recent exceedance RY 2025 · 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

501 Del Norte Blvd

Oxnard · Notice of Intent

derived_watershed_association