← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Sand Creek (tributary to Marsh Creek, Contra Costa County; in Delta Waterways, western portion)

Waterbody ID (WBID)
CAR5430001120080808191800
County / counties
Contra Costa
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 (10)

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
ChlorpyrifosPesticides118747Do Not Delist from 303(d) list (being addressed with action other than TMDL)Revised5C Addressed by action other than a TMDL
DDE (Dichlorodiphenyldichloroethylene)Pesticides74254List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
DDT (Dichlorodiphenyltrichloroethane)Pesticides74423List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
DiazinonPesticides118748Do Not Delist from 303(d) list (being addressed with action other than TMDL)Revised5C Addressed by action other than a TMDL
DieldrinPesticides118749Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Indicator BacteriaPathogens73250Do Not Delist from 303(d) list (TMDL required list)Original5A TMDL still requiredLow
Oxygen, DissolvedNutrients128828List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
SalinitySALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES72776List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
Specific ConductivitySALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES129603Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
ToxicityTotal Toxics73052Do Not Delist from 303(d) list (TMDL required list)Original5A 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
CAR5430001120080808191800
CALWNUM
6544
WBD code
180400030702
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
2.83 Miles

Derived facility associations

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

Derived
A A Auto Parts

Brentwood · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Golden Gate Petroleum

Brentwood · Notice of Intent · 0.89 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Groceryworks Operating Company LLC

Brentwood · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Intrepid Delivery

Brentwood · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Mike Asbill Painting

Brentwood · Notice of Non-Applicability · 0.69 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Pena Auto Dismantler 1 LLC

Oakley · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

TownCentre Self Storage

Brentwood · Notice of Non-Applicability · 0.41 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.