Walnut Creek

2026 303(d) list Waterbody ID CAR2073104019990218110904 River & Stream Region 2 · San Francisco Bay

At a glance

2026 listing Evidence: State-published: On the 2026 303(d) list · 5 Appendix A decisions; Category 5: a TMDL is required; What a listing means
Pollutants and stressors: 5 pollutants in 3 Appendix A categories; Other Cause (1) · Pesticides (3) · Total Toxics (1); Listing decisions
TMDL information Evidence: State-published: 5 decisions with a TMDL requirement status; 4 name a TMDL project; Status codes as published: 5A, 5B; TMDL details
Regional Water Board: Region 2 · San Francisco Bay; River & Stream · Map
Industrial stormwater facilities: 11 report it as their receiving water Evidence: identification corroborated; 39 within 1 km Evidence: geographic proximity; Neither count establishes a discharge · Facilities

What a 303(d) listing means

The Clean Water Act section 303(d) list names waters that do not meet water quality standards for one or more pollutants or stressors. California publishes it in the Integrated Report; this page shows the 2026 decisions from Appendix A as published.

A listing describes the condition of the waterbody. It does not identify which sources cause the impairment, and it does not by itself place a requirement on any particular facility.
Listed waters do not all have the same status. The Integrated Report category says how an impairment is being addressed: 5, a TMDL is required; 4a, addressed by a USEPA-approved TMDL; 4b, addressed by other pollution control requirements; 4c, impairment not caused by a pollutant. This waterbody's decisions are in category 5.
TMDL requirement status values (such as 5A or 5B) are shown exactly as published in Appendix A.

2026 listing status Evidence: State-published

On the 2026 303(d) list: Yes
Appendix A decisions: 5
Integrated Report category: 5 (a TMDL is required)
Listing cycle: 2026
State Board adoption: 2026-02-03 (Resolution 2026-0005)
USEPA approval: not confirmed — submittal letter to USEPA published; no approval found on the report page (checked 2026-10-22)
Regional Water Board: 2 — San Francisco Bay

Published by the State Water Resources Control Board (2026 California Integrated Report, Appendix A). Listing status is taken from Appendix A only. A listing describes the condition of this waterbody, not of any facility.

Location

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Listing decisions and pollutants Evidence: State-published

Grouped by the Pollutant Category published in Appendix A. Pollutant names, categories and decisions are exactly as published.

Other Cause (1 decision)

Other Cause: Appendix A decisions
Pollutant	Pollutant category	Category	Final listing decision	Decision status	Sources	Decision ID
Benthic Community Effects	Other Cause	5	List on 303(d) list (TMDL required list)	Revised	A Source Unknown	154165

Pesticides (3 decisions)

Pesticides: Appendix A decisions
Pollutant	Pollutant category	Category	Final listing decision	Decision status	Sources	Decision ID
Bifenthrin	Pesticides	5	List on 303(d) list (being addressed by USEPA approved TMDL)	Revised	Other Urban Runoff Surface Runoff	142524
Diazinon	Pesticides	5	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	A Source Unknown Other Urban Runoff Surface Runoff	142494
Pyrethroids	Pesticides	5	List on 303(d) list (being addressed by USEPA approved TMDL)	Revised	Other Urban Runoff Surface Runoff	142517

Total Toxics (1 decision)

Total Toxics: Appendix A decisions
Pollutant	Pollutant category	Category	Final listing decision	Decision status	Sources	Decision ID
Toxicity	Total Toxics	5	List on 303(d) list (being addressed by USEPA approved TMDL)	Revised	Other Urban Runoff Surface Runoff	142515

TMDL information Evidence: State-published

TMDL information published for this waterbody
Pollutant	TMDL requirement status	TMDL project	Priority	USEPA approval of TMDL	Expected attainment
Benthic Community Effects	5A	—	Low	—	—
Bifenthrin	5B	San Francisco Bay Urban Creeks Diazinon	—	2007-05-21	—
Diazinon	5B	San Francisco Bay Urban Creeks Diazinon	—	2007-05-21	—
Pyrethroids	5B	San Francisco Bay Urban Creeks Diazinon	—	2007-06-21	—
Toxicity	5B	San Francisco Bay Urban Creeks Diazinon	—	2007-05-21	—

This is TMDL information for the waterbody. It does not establish that a TMDL applies to any particular facility. Facility-specific TMDL requirements recorded in SMARTS appear on facility pages and are not linked to this waterbody until reviewed.

HUC12 watersheds

Published with the listing Evidence: publisher-reported

San Ramon Creek 180500010201
Walnut Creek-Frontal Suisin Bay Estuaries 180500010204
Suisun Bay Estuaries-Frontal Suisun Bay 180500010401

Overlapping the waterbody's shape Evidence: spatial

San Ramon Creek 180500010201 also published
Walnut Creek-Frontal Suisin Bay Estuaries 180500010204 also published
Suisun Bay Estuaries-Frontal Suisun Bay 180500010401 also published

Industrial stormwater facilities

Evidence: identification corroborated

Shows: the facility named this waterbody as its receiving water in SMARTS, and the name and the facility's location are consistent with it. Does not establish: a discharge pathway, a discharge of any pollutant, or a cause of the listing.

Evidence: geographic proximity

Shows: the facility's reported location is within 1 km of the waterbody's mapped shape. Does not establish: that the facility discharges to this waterbody, or any other relationship.

Report this waterbody as their receiving water Evidence: identification corroborated

Facilities whose reported receiving water is identified as this waterbody
Facility	WDID	Status	Distance from reported location	Map
Mobility Plus	2 07I026404	Terminated	64 m	map
UPS Concord Center CACON	2 07I002014	Terminated	121 m	map
USPS Walnut Creek VMF	2 07I006117	Terminated	477 m	map
USPS Walnut Creek VMF	2 07NEC000554	Active	477 m	map
Valley Waste Mgt	2 07I002045	Terminated	925 m	map
Contra Costa County Buchanan Field	2 07I002608	Active	962 m	map
Concord Service Center	2 07I023668	Terminated	1.0 km	map
Concord Service Center	2 07NEC000092	Terminated	1.0 km	map
Acme Landfill	2 07I000437	Terminated	2.4 km	map
Acme Landfill	2 07I029959	Active	2.4 km	map
Acme Landfill	2 07NEC000293	Terminated	2.4 km	map

Receiving water reported by facility — waterbody identification corroborated by geographic evidence. 11 facilities.

Within 1 km of a facility's reported location Evidence: geographic proximity

Spatial proximity only; discharge pathway not established. Being near this waterbody does not mean a facility discharges to it.

Facilities whose reported location is within 1 km of this waterbody
Facility	WDID	Status	Distance	Map
Mobility Plus	2 07I026404	Terminated	64 m	map
ACRO Associates	2 01IN604992	Terminated	74 m	map
ACRO Associates	2 07NEC006226	Terminated	74 m	map
ABBA STORGE	2 07NNA001854	No Action Required	92 m	map
UPS Concord Center CACON	2 07I002014	Terminated	121 m	map
REACH 032 100 - Contra Costa Concord	2 07NNA001645	No Action Required	138 m	map
Calex Manufacturng	2 07NEC014430	Active	145 m	map
Micropump	2 07I001294	Terminated	152 m	map
CalPortland Company DBA Central Martinez RA Plant	2 07I031622	Active	217 m	map
Pleasant Paper Recycling Inc	2 07I023981	Active	236 m	map
Pleasant Paper Recycling Inc	2 07I023982	Active	296 m	map
County Quarry Products Inc	2 07I013597	Active	324 m	map
Chroma Watercolors	2 07NEC015485	Active	330 m	map
Concord Main Post Office	2 07I013008	Terminated	355 m	map
SFPP LP Concord Station	2 07I024480	Active	372 m	map
Fresenius Medical Care	2 07NEC004336	Active	373 m	map
Public Storage	2 07NNA000941	No Action Required	373 m	map
AMR Concord	2 07I026952	Terminated	386 m	map
AMR Concord	2 07NEC005521	Active	386 m	map
USPS Walnut Creek VMF	2 07I006117	Terminated	477 m	map
USPS Walnut Creek VMF	2 07NEC000554	Active	477 m	map
Royal Trucking	2 07I014605	Active	491 m	map
Sun Chemical	2 07NEC015995	Active	532 m	map
Public Storage	2 07NNA000944	No Action Required	555 m	map
Mt Diablo Unified Sch Dist Mai	2 07I018308	Active	608 m	map
US Army Reserve Ctr	2 07I013563	Terminated	631 m	map
Conco Martinez Yard	2 07I019771	Terminated	632 m	map
ygnacio center	2 07NNA002532	No Action Required	651 m	map
Valley Waste Management	2 07IN602640	No Action Required	660 m	map
Residence & Shop	2 07I004387	Terminated	762 m	map
Valley Waste Mgt	2 07I009909	Terminated	789 m	map
Security Public Storage Walnut Creek	2 07NNA000957	No Action Required	805 m	map
Walnut Creek Office	2 07NNA002643	No Action Required	805 m	map
Concord Ready Mix	2 07I009449	Active	895 m	map
Valley Waste Mgt	2 07I002045	Terminated	925 m	map
Hanson Aggregates	2 07I000139	Terminated	957 m	map
Central Concrete Supply Inc	2 07I016408	Terminated	957 m	map
Contra Costa County Buchanan Field	2 07I002608	Active	962 m	map
TOMRA Pacific Service Center	2 01I018689	Terminated	987 m	map

39 facilities, nearest first.

Sources and provenance

Sources behind this page
Information	Source	Retrieved
Watershed Boundary Dataset HU2 GeoPackages 15, 16, 18 (WBDHU12)	USGS	2026-10-22
2026 California Integrated Report, Appendix A: 2026 303(d) List (final)	SWRCB	2026-10-22
Final_2026_Rivers_and_Streams + Final_2026_Lakes_and_Reservoirs (FeatureServer 0)	SWRCB GIS	2026-10-22
SMARTS TMDL requirements	SMARTS	2026-10-21

Relationships computed 2026-10-22 (facility_huc12/1, proximity/1, receiving_water/2, tmdl_reference/1, waterbody_huc12_ovl/1, waterbody_huc12_pub/1).

Integrated Report categories: 5, a TMDL is required; 4a, addressed by a USEPA-approved TMDL; 4b, addressed by other pollution control requirements; 4c, impairment not caused by a pollutant.