California Stormwater Intelligence

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Waterbody profile

Official Water Board record · 2026 cycle

Walthall Slough (in Delta Waterways, eastern portion)

Waterbody ID (WBID): CAR5440000020080818111435
County / counties: San Joaquin
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 (2)

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
Oxygen, DissolvedNutrients	128853	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Total Dissolved SolidsSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES	118930	List on 303(d) list (TMDL required list)	Revised	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: Sep 16, 2026, 10:57 PM UTC
Waterbody ID: CAR5440000020080818111435
CALWNUM: 6544
WBD code: 180400030203
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: 9.94 Miles

Derived facility associations

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

Derived

Advantage metal products

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Almond Blossom Self Storage

Ripon · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Better Built Truss

Ripon · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

California Freight

Ripon · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Ripon · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Concrete Inc Tracy Plant

Tracy · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

De Jong Trucking

Ripon · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Guntert Sales Zimmerman

Ripon · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Ripon · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Ripon · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Lyru Engineering Incorporated

San Leandro · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Ripon · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Ripon · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Ripon Manufacturing Co Inc

Ripon · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Ripon Milling Co

Ripon · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

River Oak Orchards

Manteca · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Ripon · Notice of Non-Applicability

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.