Watsonville Slough

Waterbody ID (WBID): CAR3051003019981209150043
County / counties: Santa Cruz
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 (12)

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
AluminumMetals	151450	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ChlorpyrifosPesticides	107162	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
CopperMetals	107163	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
DDE (Dichlorodiphenyldichloroethylene)Pesticides	130179	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ImidaclopridPesticides	107198	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
MalathionPesticides	107176	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
NickelMetals	107178	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
NitrateNutrients	128275	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Pajaro River Watershed Nutrients	—
Oxygen, DissolvedNutrients	107185	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Pajaro River Watershed Nutrients	—
PyrethroidsPesticides	144871	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ToxicityTotal Toxics	107193	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
TurbiditySediment	107195	Do Not Delist from 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: CAR3051003019981209150043
CALWNUM: 3305.100301
WBD code: 180600020804, 180600020805
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: 6.2 Miles

Facilities with an NAL exceedance for a listed pollutant (5)

Geographically associated industrial stormwater facilities whose reported results exceeded an Industrial General Permit Numeric Action Level for a pollutant this waterbody is listed for.

Derived

Coast Auto Supplies Dism Inc3 44I004786

Aluminum, Copper · most recent exceedance RY 2016 · association: derived nearby in watershed

Nutrien Ag Solutions Inc3 44I029864

Aluminum · most recent exceedance RY 2025 · association: derived watershed association

Pajaro valley fabrication3 44I026009

Aluminum · most recent exceedance RY 2020 · association: derived nearby in watershed

Santa Cruz Cnty Buena Vista La3 44I001258

Aluminum · most recent exceedance RY 2025 · association: derived watershed association

Watsonville Municipal Ser Cen3 44I003034

Aluminum · most recent exceedance RY 2025 · association: derived nearby in watershed

This is derived co-occurrence between a calculated NAL comparison and the official 303(d) listing for this waterbody. An NAL exceedance triggers Exceedance Response Actions under the permit; it is not a violation and does not establish that any facility caused or contributed to this impairment.

Derived facility associations

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

Derived

A and S Metals

Watsonville · Notice of Intent · 0.31 km away

derived_nearby_in_watershed