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Waterbody profile

Official Water Board record · 2026 cycle

Walnut Creek

Waterbody ID (WBID)
CAR2073104019990218110904
County / counties
Contra Costa
Regional Water Board
Regional Board 2 - San Francisco Bay Region
Waterbody type
River & Stream
Condition category
Category 5 — 303(d) listed, TMDL required
Integrated Report cycle
2026

303(d) listings (5)

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
Benthic Community EffectsOther Cause154165List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
BifenthrinPesticides142524List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLSan Francisco Bay Urban Creeks Diazinon—
DiazinonPesticides142494Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLSan Francisco Bay Urban Creeks Diazinon—
PyrethroidsPesticides142517List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLSan Francisco Bay Urban Creeks Diazinon—
ToxicityTotal Toxics142515List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B — Addressed by USEPA-approved TMDLSan Francisco Bay Urban Creeks Diazinon—

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, 10:56 PM UTC
Waterbody ID
CAR2073104019990218110904
CALWNUM
2207.310104, 2207.320202
WBD code
180500010201, 180500010204, 180500010401
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
11.54 Miles

Derived facility associations

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

Derived
1704 Route 4 Concord Batch Plant

Martinez · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

ABBA STORGE

Concord · Notice of Non-Applicability · 0.10 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Acme Landfill

Martinez · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

ACRO Associates

Concord · No Exposure Certification · 0.07 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Allied Waste Systems Inc

Pacheco · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Alternative Biologics

Benicia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

AMR-Concord-3

Concord · No Exposure Certification · 0.38 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Bayshore Center

Benicia · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Benicia Harbor Corporation

Benicia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Biocare Medical LLC

Pacheco · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Bradbury & Bradbury Wallpapers

Benicia · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Carone Co Inc

Concord · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Castle Hill Holdings Inc

Pleasant Hill · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Central Concrete

Martinez · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Clean Harbors Env Services Inc

Benicia · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Cnty Quarry Prod

Martinez · Notice of Intent · 0.33 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Conco

Benicia · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Concord Ready Mix

Concord · Notice of Intent · 0.89 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Concord Yellow Cab Inc

Pacheco · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Conrad Viano Winery

Martinez · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Contra Costa County Buchanan Field

Concord · Notice of Intent · 0.95 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Contra Costa Transfer Recovery Station

Martinez · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Copart Auto Auctions

Martinez · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

CubeSmart 0758

Benicia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Custom Coils Inc

Benicia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Dafodin Cargo

Martinez · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Falck Northern California

Pacheco · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

FedEx Express Corp CCRA

Pacheco · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Fernandes Auto Wreckers

Pittsburg · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Flavor Insights

Benicia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Fresenius Medical Care

Concord · No Exposure Certification · 0.37 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Kent Odell Furniture

Benicia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Kermetico Inc

Benicia · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Linde Inc

Benicia · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Mt Diablo Unified Sch Dist Mai

Concord · Notice of Intent · 0.60 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Pickett Racining

Benicia · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Pleasant Paper Recycling Inc

Concord · Notice of Intent · 0.30 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Pleasant Paper Recycling Inc

Concord · Notice of Intent · 0.24 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

REACH 032 100 - Contra Costa Concord

Concord · Notice of Non-Applicability · 0.14 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Royal Trucking

Concord · Notice of Intent · 0.49 km away

derived_receiving_water

Derived by California Stormwater Intelligence

SFPP LP Concord Station

Concord · Notice of Intent · 0.37 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Underground Construction Co Inc

Benicia · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

UPS Concord Center CACON

Concord · Notice of Intent · 0.12 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

USPS Walnut Creek VMF

Walnut Creek · No Exposure Certification · 0.48 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

ygnacio center

Walnut Creek · Notice of Non-Applicability · 0.66 km away

derived_nearby_in_watershed

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.