← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Grayson Creek

Waterbody ID (WBID)
CAR2073301020080624163514
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 Cause154166List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
BifenthrinPesticides142644List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSan Francisco Bay Urban Creeks Diazinon
DeltamethrinPesticides142651List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSan Francisco Bay Urban Creeks Diazinon
PyrethroidsPesticides142637List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSan Francisco Bay Urban Creeks Diazinon
TrashTrash89419Do Not Delist from 303(d) list (being addressed with action other than TMDL)Original5C Addressed by action other than a TMDL

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
CAR2073301020080624163514
CALWNUM
2207.310104, 2207.330002, 2207.330003
WBD code
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
9.71 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 · 0.60 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

ABBA STORGE

Concord · Notice of Non-Applicability

derived_watershed_association

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

derived_watershed_association

Derived by California Stormwater Intelligence

Allied Waste Systems Inc

Pacheco · Notice of Intent · 0.34 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

AMR-Concord-3

Concord · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Biocare Medical LLC

Pacheco · No Exposure Certification · 0.39 km away

derived_nearby_in_watershed

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 · 0.50 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Central Concrete

Martinez · Notice of Intent · 0.32 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Cnty Quarry Prod

Martinez · Notice of Intent · 0.00 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Concord Yellow Cab Inc

Pacheco · No Exposure Certification · 0.39 km away

derived_nearby_in_watershed

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 · 0.62 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

Dafodin Cargo

Martinez · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Eagle Marine

Martinez · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Falck Northern California

Pacheco · No Exposure Certification · 0.33 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

FedEx Express Corp CCRA

Pacheco · Notice of Intent · 0.35 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Fresenius Medical Care

Concord · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Mt Diablo Unified Sch Dist Mai

Concord · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Pleasant Paper Recycling Inc

Concord · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

REACH 032 100 - Contra Costa Concord

Concord · Notice of Non-Applicability · 0.58 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

SFPP LP Concord Station

Concord · Notice of Intent · 0.70 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Union Pacific Railroad Suisun City

Suisun City · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

UPS Concord Center CACON

Concord · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

USPS Walnut Creek VMF

Walnut Creek · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

USS Posco Industries West Facilities

Pittsburg · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

ygnacio center

Walnut Creek · 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.