← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Prefumo Creek

Waterbody ID (WBID)
CAR3102401220020124125422
County / counties
San Luis Obispo
Regional Water Board
Regional Board 3 - Central Coast 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
Escherichia coli (E. coli)Pathogens125831List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
NitrateNutrients127847Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSan Luis Obispo Creek Nutrients
Oxygen, DissolvedNutrients109234Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
SeleniumMetals109239List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
ToxicityTotal Toxics109244Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow

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
CAR3102401220020124125422
CALWNUM
3310.240102, 3310.240202
WBD code
180600060702
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
6.23 Miles

Derived facility associations

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

Derived
AIR VOL BLOCK LLC

San Luis Obispo · Notice of Intent · 0.53 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Bimbo Bakeries USA Inc

San Luis Obispo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Bimbo Bakeries USA Inc San Luis Obispo Sales Center

San Luis Obispo · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Calportland Construction

San Luis Obispo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Chevron Avila Terminal

Avila Beach · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Edna Valley Vineyards

San Luis Obispo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Entegris Plant 1750

San Luis Obispo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Ernie Ball Inc

San Luis Obispo · No Exposure Certification · 0.90 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

FedEx Freight San Luis Obispo

San Luis Obispo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

FedEx SBPA

San Luis Obispo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

First Transit Inc 55575

San Luis Obispo · Notice of Intent · 0.92 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Hanson Aggregates

San Luis Obispo · Notice of Intent · 0.82 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Kompogas SLO LLC

San Luis Obispo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Phase 2 Celars LLC

San Luis Obispo · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Phase 2 Cellars

San Luis Obispo · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Promega Biosciences Inc

San Luis Obispo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

San Luis Auto Salvage

San Luis Obispo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

San Luis Corp Yard San Luis Coastal Unified

San Luis Obispo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

San Luis Garbage Company

San Luis Obispo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

San Luis Obispo Cnty Mc Chesne

San Luis Obispo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

San Luis Opispo City WRRF

San Luis Obispo · Notice of Intent · 0.93 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

SLO Brewing Co LLC

San Luis Obispo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

SLO City Storage

San Luis Obispo · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Stephen Ross Wine Cellars

San Luis Obispo · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

UPS San Luis Obispo CASLO

San Luis Obispo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

USPS San Luis Obispo VMF

San Luis Obispo · No Exposure Certification · 0.33 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Zoo Med

San Luis Obispo · No Exposure Certification

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.