Calleguas Creek Reach 4 (Revolon Slough)

Waterbody ID (WBID): CAR4031100019990202140512
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 (19)

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	153873	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Benthic Community EffectsOther Cause	151845	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ChemA (tissue)Pesticides	75002	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Historic Pesticides (5)	—
Chlordane (tissue & sediment)Pesticides	69847	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)	—
ChlorpyrifosPesticides	136428	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)	—
Chlorpyrifos (tissue)Pesticides	69089	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Toxicity (2)	—
DiazinonPesticides	70654	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Toxicity (2)	—
Dieldrin (tissue)Pesticides	70646	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 & sediment)Pesticides	70818	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)	—
Fecal ColiformPathogens	68718	Do Not Delist from 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
Nitrate as Nitrate (NO3)Nutrients	68672	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Nitrogen (1)	—
NitrogenNutrients	70580	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) (tissue)Toxic Organics	99252	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek PCBs (7)	—
Sedimentation/SiltationSediment	70550	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
SeleniumMetals	70641	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Metals (6)	—
Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)Pesticides	71944	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)	—
Toxaphene (tissue & sediment)Pesticides	68914	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)	—
ToxicityTotal Toxics	69784	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Toxicity (2)	—
TrashTrash	77519	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Calleguas Creek Trash (9)	—

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: CAR4031100019990202140512
CALWNUM: 4408.11
WBD code: 180701030106, 180701030107
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: 8 Miles

Facilities with an NAL exceedance for a listed pollutant (1)

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

Aluminum · most recent exceedance RY 2025 · association: derived receiving water

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

540 Spectrum Cr

Oxnard · Notice of Intent · 0.97 km away

derived_receiving_water