Sierra Alloys Co Inc
Terminated WDID 4 19I023509 Irwindale, Los Angeles County Region 4 · Los Angeles
At a glance
- Permit Evidence: SMARTS record
- Terminated Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Irwindale, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- San Gabriel River (as reported by the facility)
- Evidence: candidate, awaiting review Details
- Identified receiving water on the 2026 303(d) list
- Not established
- Shown only when the reported receiving water is identified and corroborated.
- 2026 Integrated Report waters within 1.0 km Evidence: geographic proximity
- None
- Monitoring results Evidence: facility-reported
- 408 distinct results, 10 reporting years (2015 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 3 inspections · 1 violation record · 2 enforcement actions
- Counts as published in SMARTS; not a compliance determination · Details
Each label shows where a statement comes from. How to read the labels.
Overview and location
Reported facility location HUC12 watershed Corroborated receiving water 2026 Integrated Report waterbodies nearby
Reported location Evidence: facility-reported
- Coordinates
- 34.1122, -117.929602
- Precision
- 4 decimal places
- Shared point
- No
- Matches application record
- same
Facility location as reported by the discharger in SMARTS; not a discharge point or outfall.
- Facility address
- 5467 Ayon Ave, Irwindale 91706
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Big Dalton Wash HUC12 180701060402
The facility's reported location lies within this HUC12 watershed (spatial derivation); it is not a discharge location.
Permits and applications Evidence: SMARTS record
Current permit record
- Permit type
- Industrial
- Application type
- Notice of Intent (WDID code I)
- Status
- Terminated
- Operator
- Sierra Alloys Co Inc
- Primary industry (SIC)
- 3399-Primary Metal Products, NEC
- Application ID
- 424098
- NOI processed
- Feb 08, 2012
- Termination effective
- Aug 18, 2026
- Last certified
- Jun 07, 2024
- Facility size
- 3 Acres
- Impervious area
- 75 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 424098 | Industrial | Terminated | Feb 08, 2012 | Aug 18, 2026 | Jun 07, 2024 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- San Gabriel River
- Discharges directly / indirectly
- N / Y (as answered in the permit application)
Evidence: not confirmed Evidence: candidate, awaiting review Awaiting review
Receiving-water text as reported by the discharger in SMARTS; no waterbody identification has been confirmed.
Why it is not confirmed (1)
- C1 name is only a prefix of official names
10 official waterbodies share this name; none is assigned without review.
Impaired waters and TMDLs
Two kinds of information, kept apart: 2026 Integrated Report waterbodies near the reported location (geographic proximity only), and TMDL records that SMARTS lists for this facility. Neither establishes where the facility discharges; see Receiving water for the facility's own statement.
Nearby waterbodies Evidence: geographic proximity
Spatial proximity only; discharge pathway not established. Being near a waterbody does not mean the facility discharges to it.
No 2026 Integrated Report waterbody lies within the proximity threshold of the reported location.
SMARTS TMDL records Evidence: SMARTS-reported
No TMDL records for this facility in the SMARTS TMDL export.
Reported monitoring results Evidence: facility-reported
Numeric Action Level (NAL) screening is being independently validated and is not shown. Nothing on this page states whether a result exceeded a NAL.
408 distinct measurements across 11 parameters, most recent sample Feb 16, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 54 | 9 | 0 | Oct 14, 2025 | Feb 16, 2026 |
| 2024 | 36 | 9 | 0 | Feb 07, 2025 | Feb 13, 2025 |
| 2023 | 56 | 7 | 0 | Nov 15, 2023 | Jan 22, 2024 |
| 2022 | 56 | 7 | 0 | Nov 08, 2022 | Jan 16, 2023 |
| 2021 | 42 | 7 | 0 | Oct 25, 2021 | Mar 28, 2022 |
| 2020 | 28 | 7 | 0 | Mar 10, 2021 | Mar 15, 2021 |
| 2019 | 42 | 7 | 0 | Nov 20, 2019 | Apr 06, 2020 |
| 2017 | 28 | 7 | 0 | Jan 09, 2018 | Mar 22, 2018 |
| 2016 | 50 | 7 | 0 | Dec 21, 2016 | Feb 17, 2017 |
| 2015 | 16 | 4 | 0 | Mar 11, 2016 | Apr 07, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 58 | 52 | Mar 11, 2016 | Feb 16, 2026 | Results |
| pH | SU | 58 | 0 | Mar 11, 2016 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 58 | 7 | Mar 11, 2016 | Feb 16, 2026 | Results |
| Aluminum, Total | mg/L | 54 | 12 | Dec 21, 2016 | Feb 16, 2026 | Results |
| Iron, Total | mg/L | 52 | 8 | Jan 20, 2017 | Feb 16, 2026 | Results |
| Zinc, Total | mg/L | 52 | 2 | Jan 20, 2017 | Feb 16, 2026 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 42 | 0 | Nov 20, 2019 | Feb 16, 2026 | Results |
| Chromium (Total) | mg/L | 10 | 10 | Feb 07, 2025 | Feb 16, 2026 | Results |
| Nickel, Total | mg/L | 10 | 10 | Feb 07, 2025 | Feb 16, 2026 | Results |
| Nitrogen, Total (as N) | mg/L | 10 | 0 | Jan 20, 2017 | Mar 22, 2018 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 4 | 0 | Mar 11, 2016 | Apr 07, 2016 | Results |
All results (408 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367852 | |
| Feb 16, 2026 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367852 | |
| Feb 16, 2026 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367852 | |
| Feb 16, 2026 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367852 | |
| Feb 16, 2026 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367852 | |
| Feb 16, 2026 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367852 | |
| Feb 16, 2026 | Nickel, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367852 | |
| Feb 16, 2026 | Nickel, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367852 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | .129 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1367852 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | .127 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1367852 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367852 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367852 | |
| Feb 16, 2026 | pH | 6.7 | SU | Effluent | Qualifying Storm Event | A4500HB | 1367852 | |
| Feb 16, 2026 | pH | 7.1 | SU | Effluent | Qualifying Storm Event | A4500HB | 1367852 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367852 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367852 | |
| Feb 16, 2026 | Zinc, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367852 | |
| Feb 16, 2026 | Zinc, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367852 | |
| Nov 14, 2025 | Aluminum, Total | .349 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357778 | |
| Nov 14, 2025 | Aluminum, Total | .273 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357778 | |
| Nov 14, 2025 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357778 | |
| Nov 14, 2025 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357778 | |
| Nov 14, 2025 | Iron, Total | .386 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357778 | |
| Nov 14, 2025 | Iron, Total | .25 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357778 | |
| Nov 14, 2025 | Nickel, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357778 | |
| Nov 14, 2025 | Nickel, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357778 | |
| Nov 14, 2025 | Nitrite Plus Nitrate (as N) | .092 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1357778 | |
| Nov 14, 2025 | Nitrite Plus Nitrate (as N) | .097 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1357778 | |
| Nov 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1357778 | |
| Nov 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1357778 | |
| Nov 14, 2025 | pH | 7.2 | SU | Effluent | Qualifying Storm Event | A4500HB | 1357778 | |
| Nov 14, 2025 | pH | 7.5 | SU | Effluent | Qualifying Storm Event | A4500HB | 1357778 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | 8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357778 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | 7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357778 | |
| Nov 14, 2025 | Zinc, Total | .109 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357778 | |
| Nov 14, 2025 | Zinc, Total | .046 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357778 | |
| Oct 14, 2025 | Aluminum, Total | .141 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1354524 | |
| Oct 14, 2025 | Aluminum, Total | .141 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1354524 | |
| Oct 14, 2025 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1354524 | |
| Oct 14, 2025 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1354524 | |
| Oct 14, 2025 | Iron, Total | .146 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1354524 | |
| Oct 14, 2025 | Iron, Total | .136 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1354524 | |
| Oct 14, 2025 | Nickel, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1354524 | |
| Oct 14, 2025 | Nickel, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1354524 | |
| Oct 14, 2025 | Nitrite Plus Nitrate (as N) | .189 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1354524 | |
| Oct 14, 2025 | Nitrite Plus Nitrate (as N) | .186 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1354524 | |
| Oct 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1354524 | |
| Oct 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1354524 | |
| Oct 14, 2025 | pH | 7.2 | SU | Effluent | Qualifying Storm Event | A4500HB | 1354524 | |
| Oct 14, 2025 | pH | 7.5 | SU | Effluent | Qualifying Storm Event | A4500HB | 1354524 |
Results are shown exactly as reported by the discharger. Identical rows repeated in the State's export are shown once. Where the export contains different versions of the same sample and parameter, each version is listed and flagged. Details.
Compliance and enforcement records Evidence: SMARTS record
These are records as the State Water Board publishes them in SMARTS, with the source's own types and statuses. They are not a compliance determination or rating. A record listed here is not proof of a violation beyond what the source states, and the absence of records does not establish compliance.
| Record type | Records | As published | Dates | Retrieved | List |
|---|---|---|---|---|---|
| Violations | 1 | 1 Violation · 0 Potential (preliminary) · 0 Dismissed | Aug 28, 2018 – Aug 28, 2018 | Oct 21, 2026 | All violations |
| Enforcement actions | 2 | 2 issued · 0 draft · 0 withdrawn, rescinded or superseded | Aug 28, 2018 – Oct 03, 2018 | Oct 21, 2026 | All actions |
| Inspections | 3 | inspections, not findings | Nov 02, 2023 – Aug 13, 2026 | Oct 21, 2026 | All inspections |
| Annual reports | 11 | certified reports (contents not shown) | 2015 – 2025 | Oct 21, 2026 | All reports |
| Water-quality-based corrective action reports | 0 | reports, by parameter | — | Oct 21, 2026 |
Each record type is counted by its own SMARTS identifier. A violation and the enforcement action that cites it are two records in two lists; they are never added together.
Chronological record history (17 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Aug 13, 2026 | Inspections | 2071818 | B Type compliance | Performed | Additional Info Required |
| Jul 09, 2026 | Annual reports | 1337895 | Annual report 2025 | — | |
| Jul 08, 2026 | Inspections | 2071624 | B Type compliance | Performed | No Further Action |
| Jul 10, 2025 | Annual reports | 1296832 | Annual report 2024 | — | |
| Jun 28, 2024 | Annual reports | 1246060 | Annual report 2023 | — | |
| Nov 02, 2023 | Inspections | 2065045 | B Type compliance | Finalized | Additional Info Required |
| Jul 10, 2023 | Annual reports | 1192196 | Annual report 2022 | — | |
| Jul 06, 2022 | Annual reports | 1115841 | Annual report 2021 | — | |
| Jul 14, 2021 | Annual reports | 1063966 | Annual report 2020 | — | |
| Jul 14, 2020 | Annual reports | 980907 | Annual report 2019 | — | |
| Jul 18, 2019 | Annual reports | 957191 | Annual report 2018 | — | |
| Jun 20, 2019 | Annual reports | 942624 | Annual report 2017 | — | |
| Oct 03, 2018 | Enforcement actions | 430745 | 2nd NNC - AR (Second Notice of Non-Compliance (annual report)) | Historical | |
| Aug 28, 2018 | Enforcement actions | 430326 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Aug 28, 2018 | Violations | 867421 | Late Report | Violation | Report |
| Jul 10, 2017 | Annual reports | 882102 | Annual report 2016 | — | |
| Oct 05, 2016 | Annual reports | 842911 | Annual report 2015 | — |
Sources and provenance
| Information | Source | Retrieved or published |
|---|---|---|
| Permit, location, receiving-water text | SMARTS Industrial Application Specific Data | Oct 20, 2026 |
| Permit history | SMARTS Storm Water Applications | Oct 20, 2026 |
| Monitoring results | SMARTS Industrial Parameter Data | Oct 20, 2026 |
| Watershed Boundary Dataset HU2 GeoPackages 15, 16, 18 (WBDHU12) | USGS | 2026-10-22 |
| 2026 California Integrated Report, Appendix A: 2026 303(d) List (final) | SWRCB | 2026-10-22 |
| Final_2026_Rivers_and_Streams + Final_2026_Lakes_and_Reservoirs (FeatureServer 0) | SWRCB GIS | 2026-10-22 |
| SMARTS TMDL requirements | SMARTS | 2026-10-21 |
Relationships computed 2026-10-22 with methods facility_huc12/1, proximity/1, receiving_water/2, tmdl_reference/1, waterbody_huc12_ovl/1, waterbody_huc12_pub/1; proximity threshold 1.0 km.
How to read the evidence labels
- Evidence: SMARTS record Evidence: facility-reported Information as published in SMARTS or reported by the discharger.
- Evidence: identification corroborated The reported receiving-water name identifies one official waterbody and the facility's location is consistent with it. It does not establish a discharge pathway.
- Evidence: candidate, awaiting review Evidence: not confirmed The reported name could match one or more official waterbodies, but no identification has been confirmed; nothing is assigned without review.
- Evidence: spatial Evidence: geographic proximity Derived from the reported location only.
- Evidence: SMARTS-reported Source records whose links to official references are not yet reviewed.
- Evidence: unavailable The information could not be loaded or is not in the sources.
Records are shown as published and are not compliance determinations. How geographic context is derived.