Mormon Slough (from Stockton Diverting Canal to Bellota Weir--Calaveras River)

Waterbody ID (WBID): CAR5313000020050622171527
County / counties: San Joaquin
Regional Water Board: Regional Board 5 - Central Valley Region
Waterbody type: River & Stream
Condition category: Category 5 — 303(d) listed, TMDL required
Integrated Report cycle: 2026

303(d) listings (7)

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
BifenthrinPesticides	158786	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ChlorpyrifosPesticides	158780	Do Not Delist from 303(d) list (being addressed with action other than TMDL)	Revised	5C — Addressed by action other than a TMDL	—	—
Cyhalothrin, LambdaPesticides	158789	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Oxygen, DissolvedNutrients	158781	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
pHOther Cause	158782	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
PyrethroidsPesticides	158785	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ToxicityTotal Toxics	158784	Do Not Delist from 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: CAR5313000020050622171527
CALWNUM: 6531.3
WBD code: 180400030303, 180400110307
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: 13.44 Miles

Facilities with an NAL exceedance for a listed pollutant (3)

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

Diamond Foods Inc5S39I000659

pH · most recent exceedance RY 2017 · association: derived watershed association

MV Transportation Div 095S39I025208

pH · most recent exceedance RY 2022 · association: derived watershed association

Western Square Ind Inc5S39I015367

pH · most recent exceedance RY 2024 · 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

99 Auto Dismantler

Stockton · Notice of Intent

derived_watershed_association