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Waterbody profile

Official Water Board record · 2026 cycle

Lake Merced

Waterbody ID (WBID)
CAL2021001020020315204138
County / counties
San Francisco
Regional Water Board
Regional Board 2 - San Francisco Bay 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
Oxygen, DissolvedNutrients151266Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
pHOther Cause151267Do Not Delist from 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
CAL2021001020020315204138
CALWNUM
2202.1
WBD code
180500060204
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
307.68 Acres

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

Allied Waste Services of North America LLC2 41I011340

pH · most recent exceedance RY 2015 · 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
Allied Waste Services of North America LLC

Daly City · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

KIBBLEWHITE PRECISION MACHINING INC

Pacifica · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Lauretta Printing Company

San Francisco · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Pedro Point Brewing

Pacifica · Notice of Non-Applicability

derived_watershed_association

Derived by California Stormwater Intelligence

Recology of the Coast

Pacifica · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Recology of the Coast

Pacifica · No Exposure Certification

derived_watershed_association

Derived by California Stormwater Intelligence

Tidalloft Avionics Research LLC

Pacifica · Notice of Non-Applicability

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.