← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Los Penasquitos Creek

Waterbody ID (WBID)
CAR9061000020011025112826
County / counties
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 (13)

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 Cause145050Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
BifenthrinPesticides111726Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
CyfluthrinPesticides111733List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
Cyhalothrin, LambdaPesticides111735List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
CypermethrinPesticides144946List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
Indicator BacteriaPathogens127888Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
NitrogenNutrients132042Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
PermethrinPesticides130377List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
PhosphateNutrients69190List on 303(d) list (TMDL required list)Original5A — TMDL still required—Low
PhosphorusNutrients111715List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
PyrethroidsPesticides144945List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
Total Dissolved SolidsSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES111720Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
ToxicityTotal Toxics111721Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—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, 10:57 PM UTC
Waterbody ID
CAR9061000020011025112826
CALWNUM
90610000
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
11.76 Miles

Derived facility associations

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

Derived
Ajinomoto Althea

San Diego · No Exposure Certification · 0.20 km away

derived_receiving_water

Derived by California Stormwater Intelligence

BD Biosciences

San Diego · No Exposure Certification · 0.78 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Becton Dickinson and Co

San Diego · No Exposure Certification · 0.76 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Brammer Bio LLC

San Diego · No Exposure Certification · 0.97 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Canseco, Adriana

Poway · Notice of Non-Applicability · 0.41 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Codex DNA

San Diego · No Exposure Certification · 0.39 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Integrated Microwave Corp

San Diego · No Exposure Certification · 0.22 km away

derived_receiving_water

Derived by California Stormwater Intelligence

New English Brewing Company Incorporated

San Diego · No Exposure Certification · 0.36 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Pall Filtration Separations

San Diego · No Exposure Certification · 0.21 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Precision Engine Controls

San Diego · Notice of Intent · 0.27 km away

derived_receiving_water

Derived by California Stormwater Intelligence

QuidelOrtho

San Diego · No Exposure Certification · 0.91 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Sorrento Valley Self Storage LLC

San Diego · No Exposure Certification · 1.00 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.