California Stormwater Intelligence
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Waterbody profile

Official Water Board record · 2026 cycle

Calleguas Creek Reach 9A (Conejo Creek: Calleguas Creek Reach 3 to Camrosa Diversion)

Waterbody ID (WBID)
CAR4031200019990202144636
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 (25)

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
ChemA (tissue)Pesticides69426List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
ChlordanePesticides136488Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
Chlordane (tissue)Pesticides68540List 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/SULFATES136489List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Boron/Sulfate/TDS (4)—
ChlorpyrifosPesticides136491Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Toxicity (2)—
DDT (Dichlorodiphenyltrichloroethane)Pesticides149492Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
DDT (tissue)Pesticides70411List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
DiazinonPesticides136498Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Toxicity (2)—
DieldrinPesticides136499Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
Dieldrin (tissue)Pesticides69580List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
Endosulfan (tissue)Pesticides99305List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
Indicator BacteriaPathogens68263Do Not Delist from 303(d) list (TMDL required list)Original5A — TMDL still required—Low
IronMetals136505List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
Lindane/gamma Hexachlorocyclohexane (gamma-HCH)Pesticides136507Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
Lindane/gamma-Hexachlorocyclohexane (gamma-HCH) (tissue)Pesticides99306List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
Nitrate as Nitrate (NO3)Nutrients74886List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Nitrogen (1)—
Nitrogen, NitrateNutrients68335Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Nitrogen (1)—
Nitrogen, NitriteNutrients69865List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Nitrogen (1)—
PCBs (Polychlorinated biphenyls)Toxic Organics136521Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
PCBs (Polychlorinated biphenyls) (tissue)Toxic Organics68236List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek PCBs (7)—
Total Dissolved SolidsSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES136527Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Boron/Sulfate/TDS (4)—
ToxaphenePesticides136528Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
Toxaphene (tissue & sediment)Pesticides73773List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLCalleguas Creek Historic Pesticides (5)—
ToxicityTotal Toxics136529Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLCalleguas Creek Toxicity (2)—
TrashTrash76968List 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
Aug 21, 2026, 12:44 AM UTC
Waterbody ID
CAR4031200019990202144636
CALWNUM
4408.12
WBD code
180701030105
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
1.66 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

Titan Metal Fabricators4 56I026877

Iron · most recent exceedance RY 2017 · 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
A TO B TRANSPORT

Camarillo · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Advanced Metal Fabrication

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Advanced Structural technologies Inc

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Ag Products DBA Wildfactory

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

AMR 452 East

Camarillo · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

AMT MICROWAVE CORP

Camarillo · No Exposure Certification · 0.69 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

derived_watershed_association

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 · 0.69 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Battery Streak

Camarillo · No Exposure Certification · 0.65 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Baxalta US Inc

Thousand Oaks · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Carruthers Guitars

Camarillo · No Exposure Certification · 0.98 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

derived_watershed_association

Derived by California Stormwater Intelligence

Dagan Sales & Marketing Inc

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Gc Int

Camarillo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Golden State Medical Supply

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Hi Temp Insulation Inc

Camarillo · No Exposure Certification

derived_watershed_association

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

derived_watershed_association

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 · 0.80 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 · 0.73 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

OptoTest Corporation

Camarillo · No Exposure Certification · 0.67 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Pacific Rock

Camarillo · Notice of Non-Applicability · 0.69 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

PARKER CUSTOM SCREENPRINTING

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

PBS Biotech

Camarillo · No Exposure Certification · 0.98 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 · 0.74 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Roboworm

Camarillo · No Exposure Certification · 0.81 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

santec California Corporation

Camarillo · No Exposure Certification · 0.67 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Senko Advanced Components

Camarillo · Notice of Non-Applicability · 0.81 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 · 0.79 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Skurka Aerospace inc

Camarillo · No Exposure Certification · 0.94 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Spears Manufacturing Co

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Spire Resources

Camarillo · No Exposure Certification · 0.62 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Teledyne Imaging Sensors

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

The Belport Company Inc

Camarillo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

thinklaser USA Inc

Camarillo · No Exposure Certification · 0.62 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Titan Metal Fabricators

Camarillo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Triton Tech

Camarillo · No Exposure Certification · 0.62 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Wilwood building 2&3

Camarillo · No Exposure Certification · 0.92 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 · 0.77 km away

derived_nearby_in_watershed

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.