← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

San Francisquito Canyon I

Waterbody ID (WBID)
CAR4035100020210317040821
County / counties
Los Angeles
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 (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
ManganeseMetals140042List on 303(d) list (TMDL required list)Revised5A 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
CAR4035100020210317040821
CALWNUM
4403.51
WBD code
180701020402, 180701020403
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
22.09 Miles

Derived facility associations

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

Derived
A&M Electronics

Valencia · No Exposure Certification · 0.75 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Advanced Bionics LLC

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Aero Engineering And Manufacturing

Santa Clarita · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Aerospace Dynamics International Inc

Valencia · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Ameri Seal

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

AVK Industrial Products

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

B&B

Valencia · No Exposure Certification · 0.96 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Boston Scientic Neuromodulation

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Chiquita Canyon Landfill

Castaic · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Chocolates a la Carte

Santa Clarita · No Exposure Certification · 0.11 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Classic Wire Cut Company Inc.

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Compression Source

Valencia · No Exposure Certification · 0.54 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

CoreHog

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

CYPRESS MANUFACTURING LLC

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Dangling Carrot Creative

Valencia · No Exposure Certification · 0.27 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

DBR Machine

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Eckert & Ziegler Isotope Products

Valencia · No Exposure Certification · 0.53 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Espana Fabricators

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Franmar Mfg Inc

Valencia · No Exposure Certification · 0.57 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Galaxy Bearing Co

Santa Clarita · No Exposure Certification · 0.47 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Hai Tech Lasers Inc

Santa Clarita · No Exposure Certification · 0.45 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

HOERBIGER Service Inc

Santa Clarita · No Exposure Certification · 0.43 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

howard custom boats

Valencia · No Exposure Certification · 0.92 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Howard Custom Boats

Valencia · Notice of Intent · 0.90 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

IBG Holdings Inc

Valencia · No Exposure Certification · 0.50 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Indu Electric North America Inc

Santa Clarita · No Exposure Certification · 0.57 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

LANSAIR CORPORATON

Santa Clarita · No Exposure Certification · 0.21 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

LAS Precision Machine

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Lavi Industries

Valencia · No Exposure Certification · 0.74 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Lavi Industries

Valencia · No Exposure Certification · 0.62 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Leonards Molded Products

Santa Clarita · No Exposure Certification · 0.53 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Lockheed Martin Plant 2 Rye Canyon

Santa Clarita · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Lynette Lowe Dba Dans Precision Grinding

Valencia · No Exposure Certification · 0.93 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Magic Plastics Inc

Valencia · No Exposure Certification · 0.91 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

MATO PLASTICS INC

Valencia · No Exposure Certification · 0.57 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Mikailian Meat Products

Valencia · No Exposure Certification · 0.80 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

MORGAN PRODUCTS INC

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

MPT AMERICA CORP DBA METAL PLASMA TECHNOLOGY

Valencia · No Exposure Certification · 0.16 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

MR

Valencia · No Exposure Certification · 0.46 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

MV Transportation Div 150

Santa Clarita · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Ni Pro Plastics Inc

Valencia · No Exposure Certification · 0.44 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Novacap LLC

Valencia · Notice of Intent · 0.42 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Pacesetter Safety Inc

Santa Clarita · No Exposure Certification · 0.89 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Performance Machine Technologies Inc

Santa Clarita · No Exposure Certification · 0.94 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

PRC DESOTO INTERNATIONAL INC

Valencia · No Exposure Certification · 0.32 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Princeton Tool Inc dba Paragon Precision

Santa Clarita · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Professional Footcare International Inc

Santa Clarita · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Quallion LLC

Santa Clarita · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

RAH Industries Incorperate

Valencia · No Exposure Certification · 0.34 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Romi Industries

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Schrey Sons Mold Co Inc

Valencia · No Exposure Certification · 0.30 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Scicon Technologies

Valencia · No Exposure Certification · 0.16 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

SGL Technic Inc

Valencia · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

simplify optics

Santa Clarita · No Exposure Certification · 0.11 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Simplify Optics

Santa Clarita · No Exposure Certification · 0.11 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Simpson Labs LLC

Valencia · No Exposure Certification · 0.30 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

SoCal Diesel Inc

Valencia · No Exposure Certification · 0.19 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

derived_watershed_association

Derived by California Stormwater Intelligence

Specialty Polymers and Services Incorporated

Santa Clarita · No Exposure Certification · 0.69 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

SRD LLC

Valencia · No Exposure Certification · 0.42 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Stoll Metalcraft Inc

Santa Clarita · No Exposure Certification · 0.53 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Stratasys Direct Inc

Santa Clarita · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Talladium INC

Valencia · Notice of Intent · 0.75 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Teague Custom Marine Inc

Valencia · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Telic Company

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Troll Systems

Valencia · No Exposure Certification · 0.56 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

UltraViolet Devices Incorporated

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

UTAK Laboratories INC

Valencia · No Exposure Certification · 0.19 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Valencia Plastics

Santa Clarita · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Valencia Water Reclamation Plant

Valencia · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Valley Syncom Circuits

Santa Clarita · No Exposure Certification · 0.53 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Western Filter A Division of Donaldson Company Inc

Valencia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Whitmor Plastic Wire and Cable Corporation

Valencia · No Exposure Certification · 0.49 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Woodward HRT Inc

Santa Clarita · Notice of Intent

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.