California Stormwater Intelligence

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Waterbody profile

Official Water Board record · 2026 cycle

Hennessey Lake

Waterbody ID (WBID): CAL2065003420000305095218
County / counties: Napa
Regional Water Board: Regional Board 2 - San Francisco Bay Region
Waterbody type: Lake & Reservoir
Condition category: Category 5 — 303(d) listed, TMDL required
Integrated Report cycle: 2026

303(d) listings (1)

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
MercuryMetals	152853	List on 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: CAL2065003420000305095218
WBD code: 180500020101, 180500020102
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: 762.58 Acres

Derived facility associations

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

Derived

BRAND Napa Valley

Saint Helena · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Bryant Family Vineyard

Saint Helena · No Exposure Certification · 0.98 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

buehler vineyards

Saint Helena · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Angwin · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Chappellet Winery Inc

Saint Helena · Notice of Intent · 0.02 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Colgin Partners

Napa · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

David Arthur Vineyards

Saint Helena · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Angwin · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Saint Helena · No Exposure Certification · 0.62 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Kuleto Estate Winery

Saint Helena · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

La Jota Winery & Vineyards

Angwin · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

McScherk Grape Holdings LLC

Angwin · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Neyers Vineyard

Saint Helena · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Angwin · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Pacific Union College

Angwin · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

RustRidge Winery Inc

Saint Helena · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Sage Hill Vineyard LLC

Saint Helena · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Sloan Estate Winery

Saint Helena · Notice of Intent · 0.94 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Somerston Wine Company

Saint Helena · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Stonewriter LLC

Angwin · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Summit Lake Vineyards

Angwin · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Saint Helena · No Exposure Certification · 0.10 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Napa · Notice of Intent · 0.51 km away

derived_nearby_in_watershed

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.