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Waterbody profile

Official Water Board record · 2026 cycle

Willow Slough Bypass (Yolo County)

Waterbody ID (WBID)
CAR5112000020080801152942
County / counties
Yolo
Regional Water Board
Regional Board 5 - Central Valley Region
Waterbody type
River & Stream
Condition category
Category 5 — 303(d) listed, TMDL required
Integrated Report cycle
2026

303(d) listings (8)

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
BifenthrinPesticides146964List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
BoronMetals146911Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
DiuronPesticides146925Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Indicator BacteriaPathogens149415Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
MalathionPesticides146936Do Not Delist from 303(d) list (being addressed with action other than TMDL)Revised5C Addressed by action other than a TMDL
OxyfluorfenPesticides146968List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
PyrethroidsPesticides146955List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
SeleniumMetals146948List 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
Aug 21, 2026, 12:44 AM UTC
Waterbody ID
CAR5112000020080801152942
CALWNUM
51120000
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
7.4 Miles

Derived facility associations

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

Derived
Northern Recycling CF2

Woodland · Notice of Intent · 0.60 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Wastewater Treatment Plant

Davis · Notice of Non-Applicability · 0.17 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Yolo County Central Landfill

Woodland · Notice of Intent · 0.16 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Yolo COunty Planning and Public Works

Woodland · Notice of Non-Applicability · 0.16 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.