← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

San Ramon Creek subwatershed (Contra Costa County, tributary to Walnut Creek)

Waterbody ID (WBID)
CAR2073202020210622039052
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 (4)

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 Cause154236List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
BifenthrinPesticides144182List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSan Francisco Bay Urban Creeks Diazinon
PyrethroidsPesticides144181List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSan Francisco Bay Urban Creeks Diazinon
ToxicityTotal Toxics144178List 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
Aug 21, 2026, 12:44 AM UTC
Waterbody ID
CAR2073202020210622039052
CALWNUM
2207.320201, 2207.320202, 2207.320206
WBD code
180500010201
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
26.1 Miles

Derived facility associations

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

Derived
San Ramon Valley Unified

San Ramon · Notice of Intent · 0.80 km away

derived_receiving_water

Derived by California Stormwater Intelligence

UPS San Ramon CASNR

San Ramon · Notice of Intent · 0.89 km away

derived_receiving_water

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.