← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Santa Margarita River (Upper)

Waterbody ID (WBID)
CAR9022200020011001141050
County / counties
Riverside, San Diego
Regional Water Board
Regional Board 9 - San Diego Region
Waterbody type
River & Stream
Condition category
Category 5 — 303(d) listed, TMDL required
Integrated Report cycle
2026

303(d) listings (12)

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 Cause126468List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
BifenthrinPesticides111336List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Cyhalothrin, LambdaPesticides111348List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Indicator BacteriaPathogens128037Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
IronMetals111312Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
ManganeseMetals154984Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
NitrogenNutrients165389Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
PhosphorusNutrients165390Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
PyrethroidsPesticides144932List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Total Dissolved SolidsSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES125489List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
ToxicityTotal Toxics111330Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
TurbiditySediment111331List on 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, 10:57 PM UTC
Waterbody ID
CAR9022200020011001141050
CALWNUM
90222000
Geometry
Official Water Board GIS (CA_WATERBOARDS_GIS_FINAL_2026)

Location

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

Loading map…
Watershed
Assessed size
18.3 Miles

Derived facility associations

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

Derived
Garage Brewing Co

Temecula · No Exposure Certification · 0.90 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Temecula Ready Mix

Temecula · Notice of Intent · 0.99 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.