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Waterbody profile

Official Water Board record · 2026 cycle

San Antonio Reservoir

Waterbody ID (WBID)
CAL3098300020080114173957
County / counties
Monterey, San Luis Obispo
Regional Water Board
Regional Board 3 - Central Coast Region
Waterbody type
Lake & Reservoir
Condition category
Category 5 — 303(d) listed, TMDL required
Integrated Report cycle
2026

303(d) listings (2)

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
MercuryMetals131370Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
MicrocystinsOther Cause149055List 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
Sep 16, 2026, 10:56 PM UTC
Waterbody ID
CAL3098300020080114173957
CALWNUM
3309.810302, 3309.810402, 3309.810403, 3309.810504, 3309.810601, 3309.810602, 3309.810603, 3309.810604, 3309.830000
WBD code
180600050708, 180600050709, 180600050710, 180600050711
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
5378.8 Acres

Derived facility associations

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

Derived
Pierce Ranch Vineyards

Lockwood · 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.