← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Santa Clara River Reach 7 ( Bouquet Canyon Rd to above Lang Gaging Station) (was named Santa Clara River Reach 9 on 2002 303(d) list)

Waterbody ID (WBID)
CAR4035100019990204124415
County / counties
Los Angeles
Regional Water Board
Regional Board 4 - Los Angeles Region
Waterbody type
River & Stream
Condition category
Category 4a — TMDL completed
Integrated Report cycle
2026

303(d) listings (1)

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
Indicator BacteriaPathogens77849List on 303(d) list (being addressed by USEPA approved TMDL)Original5B Addressed by USEPA-approved TMDLSanta Clara River Coliform (23b & 34)

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
CAR4035100019990204124415
CALWNUM
40351000
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
14.19 Miles

Derived facility associations

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

Derived
Amazon com Services LLC HLA2

Santa Clarita · No Exposure Certification · 0.72 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Holliday Rock Santa Clarita Plant 7

Santa Clarita · Notice of Intent · 0.40 km away

derived_receiving_water

Derived by California Stormwater Intelligence

National Ready Mixed Concrete

Santa Clarita · Notice of Intent · 0.15 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Rent A Bin

Santa Clarita · Notice of Intent · 0.20 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Saugus Water Reclamation Plant

Santa Clarita · Notice of Intent · 0.98 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Soledad

Canyon Country · Notice of Intent · 0.15 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Sulphur Springs School Dist

Canyon Country · Notice of Intent · 0.42 km away

derived_receiving_water

Derived by California Stormwater Intelligence

William S Hart Union High School District

Santa Clarita · Notice of Intent · 0.77 km away

derived_receiving_water

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.