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Waterbody profile

Official Water Board record · 2026 cycle

Calleguas Creek Reach 9B (Conejo Creek: Camrosa Diversion to Arroyo Santa Rosa)

Waterbody ID (WBID)
CAR4036300019990202145135
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 (16)

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
AmmoniaNutrients69564Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Nitrogen (1)—
ChemA (tissue)Pesticides70345List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
ChlordanePesticides70532List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
ChlorideSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES76366List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Chloride (3)—
ChlorpyrifosPesticides68948List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Toxicity (2)—
DDT (tissue)Pesticides69346List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
DiazinonPesticides73986List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Toxicity (2)—
DieldrinPesticides69392List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
Endosulfan (tissue)Pesticides70189List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
Indicator BacteriaPathogens69789Do Not Delist from 303(d) list (TMDL required list)Original5A — TMDL still required—Low
PCBs (Polychlorinated biphenyls)Toxic Organics68791List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek PCBs (7)—
SulfatesToxic Inorganics75811Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Boron/Sulfate/TDS (4)—
Total Dissolved SolidsSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES76253Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Boron/Sulfate/TDS (4)—
Toxaphene (tissue & sediment)Pesticides73503List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
ToxicityTotal Toxics69141Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Toxicity (2)—
TrashTrash76969List 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
Sep 16, 2026, 10:57 PM UTC
Waterbody ID
CAR4036300019990202145135
CALWNUM
4408.120000, 4408.230000
WBD code
180701030105
Geometry
Official Water Board GIS (CA_WATERBOARDS_GIS_FINAL_2026)

Location

Official 2026 Water Board geometry. Demonstration facility markers are shown for context only.

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Watershed
—
Assessed size
5.99 Miles

Derived facility associations

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

Derived
A TO B TRANSPORT

Camarillo · Notice of Non-Applicability · 0.56 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Advanced Metal Fabrication

Camarillo · No Exposure Certification · 0.54 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Advanced Structural technologies Inc

Camarillo · No Exposure Certification · 0.89 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Ag Products DBA Wildfactory

Camarillo · No Exposure Certification · 0.70 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

AMR 452 East

Camarillo · Notice of Non-Applicability · 0.71 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

AMT MICROWAVE CORP

Camarillo · No Exposure Certification · 0.70 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Arms Printing Company LLC

Moorpark · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

ARTISAN VEHICLE SYSTEMS

Camarillo · Notice of Intent · 0.82 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Attollo Engineering LLC

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Austria Rea Enterprises LLC

Camarillo · No Exposure Certification · 0.65 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Battery Streak

Camarillo · No Exposure Certification · 0.82 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Carruthers Guitars

Camarillo · No Exposure Certification · 0.83 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

City of Thousand Oaks

Thousand Oaks · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Crime Point Inc

Camarillo · No Exposure Certification · 0.97 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Dagan Sales & Marketing Inc

Camarillo · No Exposure Certification · 0.23 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Fujifilm Diosynth Biotechnologies

Thousand Oaks · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Gc Int

Camarillo · Notice of Intent · 0.85 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Golden State Medical Supply

Camarillo · No Exposure Certification · 0.57 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Hi Temp Insulation Inc

Camarillo · No Exposure Certification · 0.69 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Holliday Rock Ventura 27

Ventura · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Household Hazardous Waste Collection Facility

Thousand Oaks · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Hyper Tech

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

International Coffee & Tea LLC

Camarillo · Notice of Intent · 0.79 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

MAGicALL

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Magnetic Brake Systems A Division of Technical Film Systems Inc

Camarillo · No Exposure Certification · 0.91 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Midnight Manufacturing

Thousand Oaks · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Modular Motorsports Inc

Camarillo · No Exposure Certification · 0.57 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

OptoTest Corporation

Camarillo · No Exposure Certification · 0.86 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Pacific Rock

Camarillo · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

PARKER CUSTOM SCREENPRINTING

Camarillo · No Exposure Certification · 0.56 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

PBS Biotech

Camarillo · No Exposure Certification · 0.70 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Real Color Design Inc

Thousand Oaks · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Riot Energy

Camarillo · No Exposure Certification · 0.82 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Roboworm

Camarillo · No Exposure Certification · 0.54 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

santec California Corporation

Camarillo · No Exposure Certification · 0.86 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Senko Advanced Components

Camarillo · Notice of Non-Applicability · 0.63 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Sensata

Thousand Oaks · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

SIKAMA INTERNATIONAL INC

Camarillo · No Exposure Certification · 0.55 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Skurka Aerospace inc

Camarillo · No Exposure Certification · 0.99 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Spears Manufacturing Co

Camarillo · No Exposure Certification · 0.23 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Spire Resources

Camarillo · No Exposure Certification · 0.68 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Teledyne Imaging Sensors

Camarillo · No Exposure Certification · 0.60 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

The Belport Company Inc

Camarillo · No Exposure Certification · 0.54 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

thinklaser USA Inc

Camarillo · No Exposure Certification · 0.68 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Titan Metal Fabricators

Camarillo · Notice of Intent · 0.11 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Triton Tech

Camarillo · No Exposure Certification · 0.68 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Wilwood building 2&3

Camarillo · No Exposure Certification · 0.54 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Wilwood Engineering

Camarillo · No Exposure Certification · 0.83 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Zero Gravity

Camarillo · 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.