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Waterbody profile

Official Water Board record · 2026 cycle

Alhambra Wash

Waterbody ID (WBID)
CAR4053100020110724104009
County / counties
Los Angeles
Regional Water Board
Regional Board 4 - Los Angeles Region
Waterbody type
River & Stream
Condition category
Category 5 — 303(d) listed, TMDL required
Integrated Report cycle
2026

303(d) listings (1)

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
AmmoniaNutrients92671List on 303(d) list (TMDL required list)Original5A — 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, 10:56 PM UTC
Waterbody ID
CAR4053100020110724104009
CALWNUM
40531000
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
6.88 Miles

Derived facility associations

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

Derived
C&D Precision Components Inc

Pasadena · No Exposure Certification · 0.99 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Ellens Silkscreening Inc

South Pasadena · No Exposure Certification · 0.91 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Garfay Auto Sales Parts

Rosemead · Notice of Intent · 0.71 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Muro Machine Shop

South El Monte · No Exposure Certification · 0.98 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Pacific Coast Spring

South El Monte · No Exposure Certification · 0.94 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Pasadena Water Power

Pasadena · Notice of Intent · 0.87 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Victory 1 Distribution

Rosemead · Notice of Intent · 0.82 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Whale Splash Mfg LLC

South El Monte · No Exposure Certification · 0.97 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.