Waterbody profile

Official Water Board record · 2026 cycle

Cucamonga Creek Reach 1 (Valley Reach)

Waterbody ID (WBID): CAR8012100019990211101136
County / counties: Riverside, San Bernardino
Regional Water Board: Regional Board 8 - Santa Ana Region
Waterbody type: River & Stream
Condition category: Category 5 — 303(d) listed, TMDL required
Integrated Report cycle: 2026

303(d) listings (4)

Each row is one official listing decision from Appendix A of the Final 2026 California Integrated Report. Source terminology is preserved as published.

Pollutant / stressor	Decision ID	Final listing decision	Decision status	TMDL requirement status	TMDL project	TMDL priority
CadmiumMetals	77440	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
CopperMetals	74065	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
LeadMetals	78536	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
ZincMetals	73060	List on 303(d) list (TMDL required list)	Original	5A — 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: CAR8012100019990211101136
CALWNUM: 4801.21
WBD code: 180702030704, 180702030705, 180702030706
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.

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Watershed: —
Assessed size: 17.36 Miles

Facilities with an NAL exceedance for a listed pollutant (42)

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

Academy Doors8 36I024032

Zinc · most recent exceedance RY 2024 · association: derived watershed association

Alltech Inc8 36I026444

Copper · most recent exceedance RY 2022 · association: derived watershed association

Alumin Art Plating Co Inc8 36I003636

Zinc · most recent exceedance RY 2024 · association: derived watershed association

Amrep Manufacturing Company LLC8 36I028295

Zinc · most recent exceedance RY 2025 · association: derived watershed association

Arlon EMD8 36I026470

Copper · most recent exceedance RY 2016 · association: derived watershed association

Barnmaster Supply LLC8 36I026165

Copper, Zinc · most recent exceedance RY 2022 · association: derived watershed association

Bluescope Coated Products8 36I029884

Zinc · most recent exceedance RY 2025 · association: derived watershed association

Bridgestone FIrestone LLC8 36I020906

Zinc · most recent exceedance RY 2015 · association: derived watershed association

Broco Inc8 36I027542

Copper · most recent exceedance RY 2023 · association: derived watershed association

Calidad Inc8 36I017005

Zinc · most recent exceedance RY 2025 · association: derived nearby in watershed

California Die Casting Inc8 36I014740

Zinc · most recent exceedance RY 2021 · association: derived watershed association

Chino Airport8 36I004096

Copper · most recent exceedance RY 2020 · association: derived watershed association

Clement Pappas CA8 36I018602

Zinc · most recent exceedance RY 2021 · association: derived watershed association

Consolidated Precision Products8 36I014631

Copper, Zinc · most recent exceedance RY 2019 · association: derived watershed association

DM Metals8 36MR000047

Copper · most recent exceedance RY 2016 · association: derived watershed association

FD Thomas Inc8 36I029798

Zinc · most recent exceedance RY 2022 · association: derived nearby in watershed

Hartwell Corporation8 36I006528

Zinc · most recent exceedance RY 2025 · association: derived watershed association

Inland Powder Coating Corp8 36I011383

Zinc · most recent exceedance RY 2016 · association: derived watershed association

Kleen Blast Rancho Cucamonga8 36I025948

Copper, Zinc · most recent exceedance RY 2022 · association: derived watershed association

LKQ Pick A Part8 36I005137

Copper · most recent exceedance RY 2025 · association: derived watershed association

Main Street Fibers8 36MR000021

Copper · most recent exceedance RY 2022 · association: derived watershed association

Net Shapes Inc8 36I024335

Zinc · most recent exceedance RY 2025 · association: derived watershed association

Ontario Extrusions Inc8 36I009096

Zinc · most recent exceedance RY 2015 · association: derived watershed association

Ontario International Airport8 36I026885

Copper, Zinc · most recent exceedance RY 2019 · association: derived nearby in watershed

Ontario West Travel Center8 36I022148

Copper, Zinc · most recent exceedance RY 2025 · association: derived watershed association

Parco Inc8 36I016866

Zinc · most recent exceedance RY 2024 · association: derived nearby in watershed

Patton Sales Corp8 36I027356

Zinc · most recent exceedance RY 2019 · association: derived watershed association

Precision Aerospace Corporation8 36I012500

Zinc · most recent exceedance RY 2024 · association: derived watershed association

PreZero US8 36I030223

Zinc · most recent exceedance RY 2025 · association: derived watershed association

Quality Control Plating8 36I017280

Cadmium, Zinc · most recent exceedance RY 2017 · association: derived watershed association

Schlosser Forge Company8 36I000436

Zinc · most recent exceedance RY 2021 · association: derived watershed association

Searing Ind Inc8 36I014189

Zinc · most recent exceedance RY 2021 · association: derived nearby in watershed

Sign Industries Inc8 36I021099

Zinc · most recent exceedance RY 2020 · association: derived nearby in watershed

Smith International Inc8 36I024922

Zinc · most recent exceedance RY 2025 · association: derived watershed association

Southwest Mobile Storage8 36I030139

Zinc · most recent exceedance RY 2025 · association: derived watershed association

Steelscape LLC8 36I016263

Zinc · most recent exceedance RY 2025 · association: derived watershed association

Summit Machine LLC8 36I025122

Copper, Zinc · most recent exceedance RY 2025 · association: derived watershed association

Suncoast Post Tension8 36I029311

Zinc · most recent exceedance RY 2025 · association: derived watershed association

Target Fufilment Center Ontario8 36I017808

Copper · most recent exceedance RY 2017 · association: derived watershed association

The Ritescreen Company8 36I028812

Zinc · most recent exceedance RY 2021 · association: derived watershed association

Vacuum Metalizing Company Inc8 36I011467

Zinc · most recent exceedance RY 2016 · association: derived nearby in watershed

Viramontes Express Inc8 36I027944

Zinc · most recent exceedance RY 2021 · association: derived nearby in watershed

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

1652 S Sacramento Avenue

Ontario · Notice of Non-Applicability

derived_watershed_association