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Waterbody profile

Official Water Board record · 2026 cycle

Cuyama River (above Twitchell Reservoir)

Waterbody ID (WBID)
CAR3123006020080611173645
County / counties
San Luis Obispo, Santa Barbara
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 (6)

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
BoronMetals112295Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
ChlorideSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES112296Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
pHOther Cause112300Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
SodiumSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES112301Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Specific ConductivitySALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES126314Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
TurbiditySediment112304Do 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
CAR3123006020080611173645
CALWNUM
31230060
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
96.45 Miles

Derived facility associations

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

Derived
GPS River Rock Products Co

Ventucopa · No Exposure Certification · 0.23 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.