Industrial stormwater facility
4 19I010894 · Notice of Intent · Irwindale, Los Angeles
Official
Hydrologic
Official facility coordinate plotted against the official 2026 impaired-water geometry.
303(d) context
Grouped by derived geographic association class.
Lake & Reservoir · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (3) Mercury, PCBs (Polychlorinated biphenyls), pH
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (5) alpha-Endosulfan (Endosulfan 1), Copper, Indicator Bacteria, Lead, Zinc
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (2) Copper, Indicator Bacteria
Lake & Reservoir · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (5) Chlordane, DDT (Dichlorodiphenyltrichloroethane), Mercury, Organic Enrichment/Low Dissolved Oxygen, PCBs (Polychlorinated biphenyls)
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (3) Copper, Indicator Bacteria, Zinc
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (4) Benthic Community Effects, Copper, Indicator Bacteria, pH
Associations are calculated from official facility coordinates, USGS HUC12 boundaries, and official 2026 impaired-water geometry. They do not establish a discharge connection or causation.
Water Board-stated TMDL waste load allocations applied to this industrial permit in SMARTS.
No SMARTS TMDL requirement is recorded for this WDID. In the statewide TMDL export only permits in Regions 4, 8 and 9 currently carry industrial TMDL requirements, so an absence here is not a statement that the facility discharges to an unimpaired water.
Official monitoring
Self-reported industrial stormwater sampling results as submitted by the discharger to SMARTS.
Loading reported results…
| Sample date | Location | Parameter | Result | Units | Event |
|---|---|---|---|---|---|
| 2016-01-05 | SE Corner of Parking Lot | Aluminum | 2.11 | mg/L | Qualifying Storm Event |
| 2016-01-05 | SE Corner of Parking Lot | Iron | 3.92 | mg/L | Qualifying Storm Event |
| 2016-01-05 | SE Corner of Parking Lot | Oil and Grease | < 5(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2016-01-05 | SE Corner of Parking Lot | pH | 8.1 | SU | Qualifying Storm Event |
| 2016-01-05 | SE Corner of Parking Lot | Total Suspended Solids (TSS) | 48 | mg/L | Qualifying Storm Event |
| 2016-01-05 | SE Corner of Parking Lot | Zinc | 35.9 | mg/L | Qualifying Storm Event |
| 2015-11-02 | Parking Lot Roof Gutter | Aluminum | 1.64 | mg/L | Qualifying Storm Event |
| 2015-11-02 | Parking Lot Roof Gutter | Iron | 11.8 | mg/L | Qualifying Storm Event |
| 2015-11-02 | Parking Lot Roof Gutter | Oil and Grease | 27 | mg/L | Qualifying Storm Event |
| 2015-11-02 | Parking Lot Roof Gutter | pH | 6 | SU | Qualifying Storm Event |
| 2015-11-02 | Parking Lot Roof Gutter | Total Suspended Solids (TSS) | 108 | mg/L | Qualifying Storm Event |
| 2015-11-02 | Parking Lot Roof Gutter | Zinc | 147 | mg/L | Qualifying Storm Event |
| 2015-11-02 | SE Corner of Parking Lot | Aluminum | 2.25 | mg/L | Qualifying Storm Event |
| 2015-11-02 | SE Corner of Parking Lot | Iron | 5.38 | mg/L | Qualifying Storm Event |
| 2015-11-02 | SE Corner of Parking Lot | Oil and Grease | 17 | mg/L | Qualifying Storm Event |
| 2015-11-02 | SE Corner of Parking Lot | pH | 6 | SU | Qualifying Storm Event |
| 2015-11-02 | SE Corner of Parking Lot | Total Suspended Solids (TSS) | 102 | mg/L | Qualifying Storm Event |
| 2015-11-02 | SE Corner of Parking Lot | Zinc | 35.3 | mg/L | Qualifying Storm Event |
| 2015-09-15 | SE Corner of Parking Lot | Aluminum | .75 | mg/L | Qualifying Storm Event |
| 2015-09-15 | SE Corner of Parking Lot | Iron | 3.69 | mg/L | Qualifying Storm Event |
| 2015-09-15 | SE Corner of Parking Lot | Oil and Grease | 5 | mg/L | Qualifying Storm Event |
| 2015-09-15 | SE Corner of Parking Lot | pH | 7 | SU | Qualifying Storm Event |
| 2015-09-15 | SE Corner of Parking Lot | Total Suspended Solids (TSS) | 23 | mg/L | Qualifying Storm Event |
| 2015-09-15 | SE Corner of Parking Lot | Zinc | 2.15 | mg/L | Qualifying Storm Event |
Monitoring rows are official self-reported SMARTS submissions, joined to this facility by WDID. California Stormwater Intelligence does not restate, correct, average or evaluate reported values, and no benchmark comparison or violation determination is made.
YDOS-derived
Reported SMARTS analytical results compared against the Numeric Action Levels of the Industrial General Permit version in effect for each reporting year (July 1 – June 30).
| Parameter | NAL type | Calculated value | NAL | Result | Samples used | Method |
|---|---|---|---|---|---|---|
Aluminum, Total aluminum_total | Annual | 1.688 mg/L | 0.75 mg/L | Above NALAnnual average of 4 eligible result(s) compared with the annual NAL.2.25× threshold | 4 eligible | arithmetic mean of all eligible effluent results in the July 1 - June 30 reporting year (censored results assigned zero only where MDL and ML were both reported) |
Oil and Grease oil_grease | Instantaneous maximum | —1 sample above | 25 mg/L | At or below NALOne eligible result in this reporting year was outside the instantaneous maximum NAL. The Order states the condition as two or more results in one reporting year. | 4 eligible1 non-detect as zero | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
pH ph | Instantaneous maximum | —0 samples above | 6 – 9 pH units | Within NAL rangeNo eligible result in this reporting year was outside the instantaneous maximum NAL. | 4 eligible | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
Total Suspended Solids (TSS) tss | Instantaneous maximum | —0 samples above | 400 mg/L | At or below NALNo eligible result in this reporting year was outside the instantaneous maximum NAL. | 4 eligible | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
Zinc, Total zinc_total | Annual | 55.087 mg/L | 0.26 mg/L | Above NALAnnual average of 4 eligible result(s) compared with the annual NAL.211.88× threshold | 4 eligible | arithmetic mean of all eligible effluent results in the July 1 - June 30 reporting year (censored results assigned zero only where MDL and ML were both reported) |
YDOS-derived overlap
Parameters where this facility has an NAL exceedance in at least one reporting year and the geographically associated waterbody carries a 303(d) listing for the same pollutant.
ZincMonitoringAbove NAL303(d) impairmentLittle Dalton Wash
1 reporting year above the annual NAL, most recently RY 2015 · 1 303(d) listing · association: derived watershed association (low confidence)
ZincMonitoringAbove NAL303(d) impairmentSan Dimas Wash (Los Angeles County)
1 reporting year above the annual NAL, most recently RY 2015 · 1 303(d) listing · association: derived watershed association (low confidence)
Overlap is informational co-occurrence between a derived NAL comparison and an official 303(d) listing. It is not evidence that this facility caused or contributed to the impairment.
An NAL exceedance is a permit-defined condition that triggers Exceedance Response Actions under the Industrial General Permit. It is not a violation, an enforcement action, or a Water Board compliance determination. Annual values use the arithmetic average of eligible results with non-detects treated as zero; instantaneous maximum NALs (total suspended solids, oil and grease, pH) are exceeded when two or more eligible results in a reporting year fall outside the level. Rules transcribed from 2014-0057-DWQ as amended by 2015-0122-DWQ ↗ (effective 2015-07-01, superseded 2020-06-30); 2014-0057-DWQ as amended by 2018-0028-DWQ ↗ (effective 2020-07-01).
Provenance