California Stormwater Intelligence

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Waterbody profile

Official Water Board record · 2026 cycle

Arroyo Seco subwatershed (Alameda County, tributary to Arroyo Las Positas)

Waterbody ID (WBID): CAR2043009020210603047098
County / counties: Alameda
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 (3)

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
AmmoniaNutrients	150853	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Benthic Community EffectsOther Cause	154154	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ToxicityTotal Toxics	144487	List on 303(d) list (TMDL required list)	Revised	5A — 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: Aug 21, 2026, 12:44 AM UTC
Waterbody ID: CAR2043009020210603047098
CALWNUM: 2204.300601, 2204.300604, 2204.300900
WBD code: 180500040201, 180500040203
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: 14.4 Miles

Derived facility associations

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

Derived

580 Fabrication

Livermore · No Exposure Certification · 0.42 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Abayla Contracting Services Inc

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

AGM ARTISTIC SIGNS

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

AI Industries LLC Livermore

Livermore · No Exposure Certification · 0.81 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Altair Microwave Inc

Livermore · No Exposure Certification · 0.46 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Amador Business Center

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Ambassador Airport Services inc

Livermore · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

AMT Logistics LLC

Livermore · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Austin Precision Inc

Livermore · No Exposure Certification · 0.64 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Big City Corvettes

Livermore · Notice of Non-Applicability · 0.40 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Brooks Automation Inc

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Caliber Cabinets Inc

Livermore · No Exposure Certification · 0.34 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Cedar Mountain Winery

Livermore · No Exposure Certification · 0.90 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.97 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Custom Gear & Machine Incorporated

Livermore · No Exposure Certification · 0.35 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Custom Product Development Corporation

Livermore · No Exposure Certification · 0.22 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Darcie Kent Vineyards

Livermore · No Exposure Certification · 0.70 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Darcie Kent Vineyards

Livermore · No Exposure Certification · 0.70 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.05 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Alameda · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Ever Ready Junk Removal & Hauling Services

Livermore · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Exel Inc dba DHL Supply Chain

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Favalora Vineyards Winery

Livermore · No Exposure Certification · 0.50 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Ferrotec USA Corp

Livermore · No Exposure Certification · 0.32 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Ferrotec USA Corporation

Livermore · No Exposure Certification · 0.45 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Free Range Flower Wienry

Livermore · No Exposure Certification · 0.53 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Fusion Coatings Inc

Livermore · No Exposure Certification · 0.95 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Livermore · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.36 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.40 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Heritage Solutions

Livermore · Notice of Intent · 0.93 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Livermore · Notice of Non-Applicability · 0.20 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Infinity Communications LLC

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Ingenium Group LLC

Livermore · No Exposure Certification · 0.79 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Livermore · Notice of Intent · 0.82 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Jabil 122 Lindbergh

Livermore · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Jai Put Enterprise Inc

Livermore · Notice of Non-Applicability · 0.95 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Livermore · Notice of Intent · 0.33 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Joshua 18 Transport

Livermore · Notice of Non-Applicability · 0.20 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Lakin Tire West LLC

Livermore · No Exposure Certification · 0.87 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Lam Research Corporation Livermore Campus

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

LAVTA Fuel and Bus Wash

Livermore · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

LBF Enterprises dba Powermatic Associates Inc

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

LDC Plant Proteins R&D Center

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore - Las Positas

Livermore · Notice of Non-Applicability · 0.62 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Livermore - Patterson Pass

Livermore · Notice of Non-Applicability · 0.47 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Livermore Distribution Center

Livermore · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore Municipal Airport

Livermore · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore Transit Authority

Livermore · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

LLNL Livermore Site

Livermore · Notice of Intent · 0.44 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Maas Brothers Inc

Livermore · Notice of Intent · 0.60 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Modus Advanced Inc

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Momomi Co dba TruForm Metals

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.51 km away

derived_receiving_water

Derived by California Stormwater Intelligence

NIEVE DISTRIBUTORS

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Nissen Tank Farm

Livermore · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.50 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Omega Road Winery

Livermore · No Exposure Certification · 0.42 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Packaging Innovators Corp

Livermore · Notice of Intent · 0.74 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.27 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Paramount Sales

Livermore · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Penumbra Livermore

Livermore · No Exposure Certification · 0.11 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Perry brothers LLC

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Precision Static Testing

Livermore · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Protein Research

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Protek Manufacturing

Livermore · No Exposure Certification · 0.06 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

RC Ready Mix Co Inc

Livermore · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Refund Recycle Center LLC

Livermore · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Sandia National Laboratories CA

Livermore · Notice of Intent · 0.23 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Schenone Tank Farm

Livermore · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Shadow Puppet Brewing Company

Livermore · No Exposure Certification · 0.11 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Sherpa North Mines

Live Oak Springs · No Exposure Certification · 0.90 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.44 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

The Last Factory

Livermore · No Exposure Certification · 0.28 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Thermal Press International

Livermore · No Exposure Certification · 0.45 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

TR FREIGHT HAULING INC

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.10 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

TransPak Livermore Warehouse

Livermore · Notice of Intent · 0.82 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Triangle Coatings Inc

Livermore · Notice of Intent · 0.26 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Livermore · Notice of Intent · 0.28 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.23 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Livermore · No Exposure Certification · 0.27 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Vi Tec Manufacturing Incorporated

Livermore · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Wente Vineyards Estate Winery

Livermore · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Xchanger Manufacturing Corporation DBA Wiegmann & Rose

Livermore · No Exposure Certification · 0.62 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.