California Stormwater Intelligence
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Waterbody profile

Official Water Board record · 2026 cycle

Cosumnes River, Lower (below Michigan Bar to Delta Waterways)

Waterbody ID (WBID)
CAR5311100020221118037585
County / counties
Sacramento
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 (3)

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
Indicator BacteriaPathogens161516Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
Oxygen, DissolvedNutrients160489Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
ToxicityTotal Toxics160498Do 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
CAR5311100020221118037585
CALWNUM
6531.110000, 6532.210201
WBD code
180400130605, 180400130606, 180400130803
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
32.41 Miles

Derived facility associations

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

Derived
Alpha Dyno Nobel

Plymouth · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Angel Wing Winery Inc

Rancho Murieta · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Building Material Distributors Galt

Galt · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

High Country Aggregates

Plymouth · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Lodi Iron Works

Galt · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

SpeedBlock

Galt · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

VMV Logistics LLC

Rancho Murieta · No Exposure Certification

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.