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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 required—Low
BoronMetals146911Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
DiuronPesticides146925Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
Indicator BacteriaPathogens149415Do Not Delist from 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
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 required—Low
PyrethroidsPesticides146955List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
SeleniumMetals146948List on 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
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.