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Waterbody profile

Official Water Board record · 2026 cycle

Elkhorn Slough

Waterbody ID (WBID)
CAE3060001419981209073137
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 (9)

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
CopperMetals105832List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
DDT (Dichlorodiphenyltrichloroethane)Pesticides129624List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
DieldrinPesticides105835List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
NitrateNutrients125820Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredHigh
Oxygen, DissolvedNutrients105851Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredHigh
PesticidesPesticides69405List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
pHOther Cause105852Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredHigh
Sedimentation/SiltationSediment69062List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
Total ColiformPathogens130279Do 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
Aug 21, 2026, 12:44 AM UTC
Waterbody ID
CAE3060001419981209073137
CALWNUM
3306.000002, 3306.000003, 3306.000004, 3309.120002
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
2684.74 Acres

Facilities with an NAL exceedance for a listed pollutant (3)

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

Moss Landing Marine3 27I025816

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

Pick n pull Moss Landing 423 27I010373

Copper · most recent exceedance RY 2017 · association: derived watershed association

Pick n pull Moss Landing Premier 483 27I023349

Copper · most recent exceedance RY 2017 · 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
Moss Landing Marine

Moss Landing · Notice of Intent · 0.41 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Moss Landing Power Plant

Moss Landing · Notice of Intent · 0.59 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Pick n pull Moss Landing 42

Moss Landing · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Pick n pull Moss Landing Premier 48

Moss Landing · Notice of Intent · 0.12 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Sweet Earth Foods

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.