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Waterbody profile

Official Water Board record · 2026 cycle

San Joaquin River ( Merced River to Tuolumne River)

Waterbody ID (WBID)
CAR5440000020021002100850
County / counties
Merced, Stanislaus
Regional Water Board
Regional Board 5 - Central Valley Region
Waterbody type
River & Stream
Condition category
Category 5 — 303(d) listed, TMDL required
Integrated Report cycle
2026

303(d) listings (6)

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
alpha.-BHC (Benzenehexachloride or alpha-HCH)Toxic Organics93951Do Not Delist from 303(d) list (TMDL required list)Original5A TMDL still requiredLow
BoronMetals164102List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSan Joaquin River Salt and Boron
DDE (Dichlorodiphenyldichloroethylene)Pesticides169107Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Electrical ConductivitySALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES78639List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
Temperature, waterOther Cause77971Do Not Delist from 303(d) list (TMDL required list)Original5A TMDL still requiredLow
ToxicityTotal Toxics159184Do Not Delist from 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
Aug 21, 2026, 12:44 AM UTC
Waterbody ID
CAR5440000020021002100850
CALWNUM
54110000
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
33.98 Miles

Derived facility associations

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

Derived
ELEMENT LANDSCAPE MATERIALS INC

Stockton · No Exposure Certification · 0.48 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Green Pit

Crows Landing · Notice of Intent · 0.23 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.