San Gregorio Creek (San Mateo County)

Waterbody ID (WBID): CAR2023001419980929144335
County / counties: San Mateo
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 (2)

Each row is one official listing decision from Appendix A of the Final 2026 California Integrated Report. Source terminology is preserved as published.

Pollutant / stressor	Decision ID	Final listing decision	Decision status	TMDL requirement status	TMDL project	TMDL priority
Indicator BacteriaPathogens	148686	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
SedimentSediment	170608	Do Not Delist from 303(d) list (associated with a USEPA accepted Advanced Restoration Plan)	Revised	5R — Being addressed by regional board action	San Gregorio Creek Water Quality Improvement Plan	Low

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: CAR2023001419980929144335
CALWNUM: 2202.230001, 2202.230002, 2202.300002, 2202.300004, 2202.300004, 2202.400105, 2202.400200
WBD code: 180500060202, 180500060203
Geometry: Official Water Board GIS (CA_WATERBOARDS_GIS_FINAL_2026)

View official Water Board fact sheet ↗Download Appendix A source file ↗

Location

Official 2026 Water Board geometry. Demonstration facility markers are shown for context only.

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Watershed: —
Assessed size: 11.29 Miles

Derived facility associations

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

Derived

Langley Hill Quarry

Woodside · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Thomas Fogarty Winery

Portola Valley · Notice of Intent

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.