← 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 required—Low
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
Sep 16, 2026, 10:56 PM 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.