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Waterbody profile

Official Water Board record · 2026 cycle

Boulder Creek (Ventura County)

Waterbody ID (WBID)
CAR4033100020110721230014
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 (10)

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
BifenthrinPesticides139274Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
ChlordanePesticides139250List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
CyfluthrinPesticides139283List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
DDT (Dichlorodiphenyltrichloroethane)Pesticides149434List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
FenpropathrinPesticides139286List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
MalathionPesticides139264List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Nitrogen, NitrateNutrients149435List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
PermethrinPesticides139290List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
PyrethroidsPesticides139273List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
ToxicityTotal Toxics92097List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow

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, 10:56 PM UTC
Waterbody ID
CAR4033100020110721230014
CALWNUM
40331000
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
6.67 Miles

Derived facility associations

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

Derived

No industrial stormwater facility is geographically associated with this waterbody.

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.