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Waterbody profile

Official Water Board record · 2026 cycle

Castroville Slough

Waterbody ID (WBID)
CAE3091200020200717048074
County / counties
Monterey
Regional Water Board
Regional Board 3 - Central Coast Region
Waterbody type
Estuary
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 / stressorDecision IDFinal listing decisionDecision statusTMDL requirement statusTMDL projectTMDL priority
NitrateNutrients125777List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Oxygen, DissolvedNutrients115416List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
pHOther Cause115417List 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
CAE3091200020200717048074
CALWNUM
3309.120001
WBD code
180600150301
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
17.35 Miles

Derived facility associations

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

Derived
Pick n pull Moss Landing 42

Moss Landing · Notice of Intent · 0.49 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Pick n pull Moss Landing Premier 48

Moss Landing · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Sweet Earth Foods

Moss Landing · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Verdagy

Moss Landing · No Exposure Certification

derived_watershed_association

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.