Waterbody profile

Official Water Board record · 2026 cycle

Legg Lake

Waterbody ID (WBID): CAL4053100019980917155807
County / counties: Los Angeles
Regional Water Board: Regional Board 4 - Los Angeles Region
Waterbody type: Lake & Reservoir
Condition category: Category 5 — 303(d) listed, TMDL required
Integrated Report cycle: 2026

303(d) listings (8)

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
AmmoniaNutrients	68950	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Echo, Lincoln, Peck, Calabasas Eutrophications (17) and Trash (16)	—
Chlorophyll-aNutrients	136215	List on 303(d) list (being addressed by USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Echo Lake, PeckRd Lake DDT/PCBs/Chlordane (19)	—
DDT (Dichlorodiphenyltrichloroethane)Pesticides	96870	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
MercuryMetals	149613	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
OdorNuisance	69208	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Echo, Lincoln, Peck, Calabasas Eutrophications (17) and Trash (16)	—
PCBs (Polychlorinated biphenyls)Toxic Organics	96869	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
pHOther Cause	70201	List on 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
TrashTrash	75553	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Legg Lake Trash (40)	—

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: CAL4053100019980917155807
CALWNUM: 4412.31
WBD code: 180701050303
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: 27.82 Acres

Facilities with an NAL exceedance for a listed pollutant (19)

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

Alum A Coat4 19I029501

pH · most recent exceedance RY 2025 · association: derived watershed association

Arbe Ent Inc4 19I000591

pH · most recent exceedance RY 2019 · association: derived watershed association

Bob Martin Co4 19I014300

pH · most recent exceedance RY 2019 · association: derived watershed association

Box Express Mfg4 19I029151

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

CA010 El Monte US Army Reserve Ctr4 19I016450

pH · most recent exceedance RY 2020 · association: derived nearby in watershed

Durham Transportation4 19I004360

pH · most recent exceedance RY 2025 · association: derived watershed association

Garfay Auto Sales Parts4 19I025274

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

GCP Applied Technologies Inc4 19I026391

pH · most recent exceedance RY 2023 · association: derived watershed association

Jenco Plating Inc4 19I001469

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

Metro Division 44 19I000489

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

Pasadena Water Power4 19I000994

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

Pico Rivera Material Recovery Facility4 19I029250

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

South Gate Transfer Station4 19I006188

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

Suez WTS Pico Rivera Service Center4 19I027684

pH · most recent exceedance RY 2023 · association: derived watershed association

Sunshine FPC Inc4 19I020791

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

Ted Levine Drum Co4 19I002754

pH · most recent exceedance RY 2025 · association: derived watershed association

THRIFTY ICE CREAM4 19I003425

pH · most recent exceedance RY 2023 · association: derived watershed association

Vacco Industries4 19I002969

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

VCLAD Laminates4 19I029805

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

10 Roads Express LLC

Montebello · Notice of Intent

derived_watershed_association