San Lorenzo River

Waterbody ID (WBID): CAR3041202219980827084709
County / counties: Santa Cruz
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 (12)

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
AluminumMetals	151439	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Benthic Community EffectsOther Cause	131910	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ChlordanePesticides	148848	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ChlorideSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES	85245	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
ChlorpyrifosPesticides	106476	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	San Lorenzo/Zayante Chlorpyrifos TMDL	—
EnterococcusPathogens	84154	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
NitrateNutrients	150843	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	San Lorenzo River Nitrate	—
PCBs (Polychlorinated biphenyls)Toxic Organics	148868	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Sedimentation/SiltationSediment	68063	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	San Lorenzo River Sediment	—
SodiumSALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES	76471	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
Temperature, waterOther Cause	126103	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ToxicityTotal Toxics	106524	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: CAR3041202219980827084709
CALWNUM: 3304.120101, 3304.120102, 3304.120201, 3304.120202, 3304.120203, 3304.120503, 3304.120600
WBD code: 180600150201, 180600150202, 180600150203, 180600150305
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: 29.27 Miles

Facilities with an NAL exceedance for a listed pollutant (1)

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

Santa Cruz Cnty Ben Lomond Lan3 44I001259

Aluminum · most recent exceedance RY 2018 · association: derived nearby in watershed

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

Big Basin Vineyards

Boulder Creek · No Exposure Certification

derived_watershed_association