← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Tembladero Slough

Waterbody ID (WBID)
CAR3091101019981209131830
County / counties
Monterey
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 (31)

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
AluminumMetals151465List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
BifenthrinPesticides108020List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSalinas River Watershed Sediment Toxicity TMDL U.S. EPA Vision Priority
ChlordanePesticides107962List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Chlorophyll-aNutrients107963Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Original5B Addressed by USEPA-approved TMDLSalinas River Nutrients
ChlorpyrifosPesticides107965Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLLower Salinas River Chlorpyrifos and Diazinon TMDL
ChromiumMetals108040List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
ClothianidinPesticides108050List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
CopperMetals107967List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
CypermethrinPesticides108021List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSalinas River Watershed Sediment Toxicity TMDL U.S. EPA Vision Priority
DDD (Dichlorodiphenyldichloroethane)Pesticides130082List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
DDE (Dichlorodiphenyldichloroethylene)Pesticides130155List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
DiazinonPesticides107968Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLLower Salinas River Chlorpyrifos and Diazinon TMDL
DieldrinPesticides107971List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
DisulfotonPesticides107973List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
EnterococcusPathogens83698List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
ImidaclopridPesticides108016List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
LeadMetals107981List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
MalathionPesticides107984Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredHigh
MethomylPesticides108018List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
NickelMetals107988Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
NitrateNutrients129447Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSalinas River Nutrients
OxyfluorfenPesticides108025List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Oxygen, DissolvedNutrients107995Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSalinas River Nutrients
PermethrinPesticides108049List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSalinas River Watershed Sediment Toxicity TMDL U.S. EPA Vision Priority
pHOther Cause107997Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
PyrethroidsPesticides108013List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSalinas River Watershed Sediment Toxicity TMDL U.S. EPA Vision Priority
SeleniumMetals108003List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
ThiamethoxamPesticides108054List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Total ColiformPathogens130255Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredSalinas River Fecal ColiformLow
ToxicityTotal Toxics148223Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSalinas River Watershed Sediment Toxicity TMDL U.S. EPA Vision Priority
TurbiditySediment108011Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredHigh

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
CAR3091101019981209131830
CALWNUM
3309.11
WBD code
180600150103, 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.

Loading map…
Watershed
Assessed size
3.4 Miles

Facilities with an NAL exceedance for a listed pollutant (7)

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

Carmel Marina Corp3 27I017456

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

Keith Day Company Inc3 27I024222

Copper · most recent exceedance RY 2022 · association: derived watershed association

Moss Landing Marine3 27I025816

Aluminum, Copper, Lead, Nickel · most recent exceedance RY 2025 · association: derived watershed association

North Monterey County Unified School District3 27I017920

pH · most recent exceedance RY 2018 · association: derived watershed association

Peninsula Auto Dismantlers3 27I023275

Aluminum, Copper, pH · most recent exceedance RY 2025 · association: derived watershed association

Pick n pull Moss Landing Premier 483 27I023349

Aluminum, Copper · most recent exceedance RY 2018 · association: derived watershed association

Salinas Disposal Transfer Station and Recycling Center3 27I028243

Aluminum · most recent exceedance RY 2023 · association: derived watershed association

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

Castroville · Notice of Intent · 0.74 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Amercian Bottling Co

Castroville · No Exposure Certification · 0.48 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

American Cooling Inc SEMCO

Salinas · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Associated Tagline

Salinas · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Bimbo Bakeries USA Inc Castroville Sales Center

Castroville · Notice of Non-Applicability · 0.87 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Carmel Marina Corp

Castroville · Notice of Intent · 0.46 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Castroville Reclaim Concrete

Castroville · Notice of Intent · 0.91 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Cemex

Marina · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Central Coast Wood Fired Ovens LLC

San Juan Bautista · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Discovery Charters

Castroville · Notice of Intent · 0.83 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Hanbit Enterprises Inc dba Jack and the Beanstalk

Salinas · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Keith Day Company Inc

Salinas · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Monterey Farms Inc

Salinas · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Monterey Salinas Transit

Salinas · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Moss Landing Commercial Park

Moss Landing · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Moss Landing Marine

Moss Landing · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Moss Landing Power Plant

Moss Landing · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

derived_watershed_association

Derived by California Stormwater Intelligence

Ocean Mist Farms

Castroville · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Peninsula Auto Dismantlers

Prunedale · Notice of Intent

derived_watershed_association

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

derived_watershed_association

Derived by California Stormwater Intelligence

Salinas Recycling Inc

Salinas · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Salinas Union High School District

Salinas · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Santa Clara Transfer Service

Castroville · No Exposure Certification · 0.70 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Sun Street Transfer Station

Salinas · 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

UPS Salinas Center CASAL

Salinas · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Valley Pacific Petroleum Salinas

Salinas · Notice of Intent

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.