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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 required—Low
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 required—Low
Electrical ConductivitySALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES78639List on 303(d) list (TMDL required list)Original5A — TMDL still required—Low
Temperature, waterOther Cause77971Do Not Delist from 303(d) list (TMDL required list)Original5A — TMDL still required—Low
ToxicityTotal Toxics159184Do Not Delist from 303(d) list (TMDL required list)Revised5A — 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
Sep 16, 2026, 10:57 PM 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.