California Stormwater Intelligence
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Waterbody profile

Official Water Board record · 2026 cycle

McGowan Ditch

Waterbody ID (WBID)
CAR3051003020100620223644
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 (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
DDD (Dichlorodiphenyldichloroethane)Pesticides82701List on 303(d) list (TMDL required list)Original5A — TMDL still required—Low
DDE (Dichlorodiphenyldichloroethylene)Pesticides82747List on 303(d) list (TMDL required list)Original5A — TMDL still required—Low
MalathionPesticides99796List on 303(d) list (TMDL required list)Original5A — TMDL still required—Low
NitrateNutrients80638List on 303(d) list (TMDL required list)Original5A — TMDL still required—Low
OxyfluorfenPesticides129959List on 303(d) list (TMDL required list)Revised5A — TMDL still required—Low
ToxicityTotal Toxics91612List on 303(d) list (TMDL required list)Original5A — 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
CAR3051003020100620223644
CALWNUM
3305.100301
WBD code
180600020805
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
2.53 Miles

Derived facility associations

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

Derived
Granite Rock Co Wilson Quarry BR110

Aromas · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Hildebrand Sons Trucking

Watsonville · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Kristich Monterey Pipe Co

Watsonville · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Lewis Rd Sanitary Landfill

Watsonville · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Nutrien Ag Solutions Inc

Watsonville · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Rinaldi Tile and Marble

Watsonville · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

River Run Vintners

Watsonville · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Sante Arcangeli Family Wines LLC

Aromas · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

STURDY OIL COMPANY

Pajaro · Notice of Intent

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.