← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

San Antonio River (below San Antonio Reservoir)

Waterbody ID (WBID)
CAR3098100520080114174629
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 (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
Escherichia coli (E. coli)Pathogens125703Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLSan Antonio River FIB TMDL
pHOther Cause113281List 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
CAR3098100520080114174629
CALWNUM
3309.810504, 3309.810505, 3309.810507, 3309.830000
WBD code
180600050710, 180600050711, 180600050802, 180600050806
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
8.76 Miles

Facilities with an NAL exceedance for a listed pollutant (2)

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

CA Army Nat Guard3 27I011909

pH · most recent exceedance RY 2015 · association: derived watershed association

Courtside Cellars3 40I025643

pH · most recent exceedance RY 2025 · 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
CA Army Nat Guard

Camp Roberts · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Courtside Cellars

San Miguel · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Pierce Ranch Vineyards

Lockwood · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Pretty-Smith Vineyards & Winery

San Miguel · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

San Ardo Oil Field

San Ardo · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

San Ardo Oil Field

San Ardo · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Vino Vargas Winery

San Miguel · 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.