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Waterbody profile

Official Water Board record · 2026 cycle

McGrath Lake

Waterbody ID (WBID)
CAL4031100019990203110047
County / counties
Ventura
Regional Water Board
Regional Board 4 - Los Angeles Region
Waterbody type
Lake & Reservoir
Condition category
Category 5 — 303(d) listed, TMDL required
Integrated Report cycle
2026

303(d) listings (6)

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
ChlordanePesticides69421List on 303(d) list (being addressed by USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLMcGrath Lake Pesticides (25)—
DDT (Dichlorodiphenyltrichloroethane)Pesticides99417Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLMcGrath Lake Pesticides (25)—
Dieldrin (sediment)Pesticides68968Do Not Delist from 303(d) list (TMDL required list)Original5A — TMDL still required—High
Indicator BacteriaPathogens69107Do Not Delist from 303(d) list (TMDL required list)Original5A — TMDL still required—Low
PCBs (Polychlorinated biphenyls) (sediment)Toxic Organics68440Do Not Delist from 303(d) list (TMDL required list)Original5A — TMDL still required—Low
ToxicityTotal Toxics68832Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Original5B — Addressed by USEPA-approved TMDLMcGrath Lake Pesticides (25)—

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
CAL4031100019990203110047
CALWNUM
40311000
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
19.42 Acres

Derived facility associations

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

Derived
West Montalvo

Oxnard · Notice of Intent · 0.13 km away

derived_receiving_water

Derived by California Stormwater Intelligence

West Montalvo Field

Oxnard · Notice of Intent · 0.61 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.