Pine Creek subwatershed (Contra Costa Co, tributary to Walnut Creek)

2026 303(d) list Waterbody ID CAR2073101119990218101152 River & Stream Region 2 · San Francisco Bay

At a glance

2026 listing Evidence: State-published: On the 2026 303(d) list · 1 Appendix A decision; Category 4a: addressed by a USEPA-approved TMDL; What a listing means
Pollutants and stressors: 1 pollutant in 1 Appendix A category; Pesticides (1); Listing decisions
TMDL information Evidence: State-published: 1 decision with a TMDL requirement status; 1 name a TMDL project; Status codes as published: 5B; TMDL details
Regional Water Board: Region 2 · San Francisco Bay; River & Stream · Map
Industrial stormwater facilities: 0 report it as their receiving water Evidence: identification corroborated; 31 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 4a.
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: 1
Integrated Report category: 4a (addressed by a USEPA-approved TMDL)
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

Loading the waterbody shape…

Open this area on the statewide map · Browse impaired waters

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.

Pesticides (1 decision)

Pesticides: Appendix A decisions
Pollutant	Pollutant category	Category	Final listing decision	Decision status	Sources	Decision ID
Diazinon	Pesticides	4a	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	A Source Unknown	70192

TMDL information Evidence: State-published

TMDL information published for this waterbody
Pollutant	TMDL requirement status	TMDL project	Priority	USEPA approval of TMDL	Expected attainment
Diazinon	5B	San Francisco Bay Urban Creeks Diazinon	—	2007-05-16	—

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

Pine Creek 180500010203
Walnut Creek-Frontal Suisin Bay Estuaries 180500010204

Overlapping the waterbody's shape Evidence: spatial

Pine Creek 180500010203 also published
Walnut Creek-Frontal Suisin Bay Estuaries 180500010204 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

No facility's reported receiving water is identified as this waterbody.

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
Public Storage	2 07NNA000942	No Action Required	30 m	map
Public Storage	2 07NNA000943	No Action Required	52 m	map
Clayton Quarry	2 07I000140	Terminated	70 m	map
Accurate Manufacturing Company Incorporated	2 07NEC006192	Terminated	103 m	map
Matheson Truck Repair	2 07I005911	Terminated	116 m	map
Martin Marietta Clayton Aggregates	2 07I030489	Active	127 m	map
Pleasant Paper Recycling Inc	2 07I023982	Active	166 m	map
Adl Circuits Inc	2 07I010853	Terminated	167 m	map
Pleasant Paper Recycling Inc	2 07I023981	Active	188 m	map
Royal Trucking	2 07I014605	Active	198 m	map
Mountaire Garden Ctr	2 07I013656	Terminated	207 m	map
Emcore	2 07I030556	Active	212 m	map
Durham Trans	2 07I004368	Terminated	218 m	map
Durham Trans Inc	2 07I016731	Terminated	218 m	map
Laserfab Inc CA	2 07I013759	Terminated	226 m	map
Emcore Corporation	2 07I001332	Terminated	289 m	map
S F I C Corp	2 07I013028	Terminated	364 m	map
Reddy Ice Concord 128	2 07NEC015689	Active	367 m	map
Arctic Glacier	2 07NEC009839	Active	368 m	map
Bay Area Rapid Transit Concord	2 07I009423	Active	369 m	map
Concord Main Post Office	2 07I013008	Terminated	391 m	map
Concord Branch	2 07I010726	Terminated	408 m	map
Jaswinder Singh	2 07NNA001010	No Action Required	430 m	map
Public Storage	2 07NNA000941	No Action Required	461 m	map
Calex Manufacturng	2 07NEC014430	Active	800 m	map
Concord Service Center	2 07I023668	Terminated	864 m	map
Concord Service Center	2 07NEC000092	Terminated	864 m	map
TOMRA Pacific Service Center	2 01I018689	Terminated	870 m	map
Mt Diablo Unified Sch Dist Mai	2 07I018308	Active	879 m	map
AMR Concord	2 07I026952	Terminated	957 m	map
AMR Concord	2 07NEC005521	Active	957 m	map

31 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.