Al Mag Heat Treat
Active WDID 4 19I021973 South El Monte, Los Angeles County Region 4 · Los Angeles
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- South El Monte, 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
- 112 distinct results, 8 reporting years (2018 to 2026)
- Most recent sample Sep 08, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 9 violation records · 6 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
- 34.04893, -118.05715
- Precision
- 5 decimal places
- Shared point
- No
- Matches application record
- application not found
Facility location as reported by the discharger in SMARTS; not a discharge point or outfall.
- Facility address
- 9735 Alpaca St, South El Monte 91733
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Alhambra Wash-Rio Hondo HUC12 180701050303
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
- Active
- Operator
- Al Mag Heat Treat
- Primary industry (SIC)
- 3398-Metal Heat Treating
- Application ID
- 356767
- NOI processed
- Dec 19, 2008
- Last certified
- Jun 16, 2015
- Facility size
- 10000 SqFt
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
No application records for this WDID in the general applications export.
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
SMARTS TMDL record as reported for this facility; it is not a determination that the TMDL applies to the facility.
| TMDL | Waterbody (as reported) | Parameter | Limit | Type | Period | Due | Discharges to TMDL water |
|---|---|---|---|---|---|---|---|
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Zinc, Total | .159 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
1 record. Links between these records and specific TMDL projects or listed waterbodies have not been reviewed and are not shown.
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.
112 distinct measurements across 6 parameters, most recent sample Sep 08, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2026 | 6 | 6 | 0 | Sep 08, 2026 | Sep 08, 2026 |
| 2025 | 24 | 6 | 0 | Oct 14, 2025 | Feb 19, 2026 |
| 2024 | 24 | 6 | 0 | Jan 26, 2025 | Mar 13, 2025 |
| 2023 | 24 | 6 | 0 | Nov 16, 2023 | Feb 06, 2024 |
| 2022 | 18 | 6 | 0 | Jan 16, 2023 | Feb 27, 2023 |
| 2021 | 11 | 6 | 0 | Oct 25, 2021 | Dec 24, 2021 |
| 2019 | 2 | 2 | 0 | Nov 27, 2019 | Nov 27, 2019 |
| 2018 | 3 | 3 | 0 | Nov 29, 2018 | Nov 29, 2018 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 19 | 17 | Nov 29, 2018 | Sep 08, 2026 | Results |
| pH | SU | 19 | 0 | Nov 29, 2018 | Sep 08, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 19 | 3 | Nov 29, 2018 | Sep 08, 2026 | Results |
| Zinc, Total | mg/L | 19 | 7 | Nov 27, 2019 | Sep 08, 2026 | Results |
| Aluminum, Total | mg/L | 18 | 9 | Oct 25, 2021 | Sep 08, 2026 | Results |
| Iron, Total | mg/L | 18 | 9 | Oct 25, 2021 | Sep 08, 2026 | Results |
All results (112 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Sep 08, 2026 | Aluminum, Total | .015 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1396678 | |
| Sep 08, 2026 | Iron, Total | .017 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1396678 | |
| Sep 08, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1396678 | |
| Sep 08, 2026 | pH | 6.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1396678 | |
| Sep 08, 2026 | Total Suspended Solids (TSS) | 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1396678 | |
| Sep 08, 2026 | Zinc, Total | .007 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1396678 | |
| Feb 19, 2026 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370207 | |
| Feb 19, 2026 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370207 | |
| Feb 19, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1370207 | |
| Feb 19, 2026 | pH | 6.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1370207 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | .8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370207 | |
| Feb 19, 2026 | Zinc, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370207 | |
| Feb 11, 2026 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1368136 | |
| Feb 11, 2026 | Iron, Total | DNQ .024 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1368136 | |
| Feb 11, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1368136 | |
| Feb 11, 2026 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1368136 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1368136 | |
| Feb 11, 2026 | Zinc, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1368136 | |
| Nov 17, 2025 | Aluminum, Total | DNQ .032 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1359886 | |
| Nov 17, 2025 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1359886 | |
| Nov 17, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1359886 | |
| Nov 17, 2025 | pH | 6.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1359886 | |
| Nov 17, 2025 | Total Suspended Solids (TSS) | 1.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1359886 | |
| Nov 17, 2025 | Zinc, Total | .018 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1359886 | |
| Oct 14, 2025 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1355622 | |
| Oct 14, 2025 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1355622 | |
| Oct 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1355622 | |
| Oct 14, 2025 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1355622 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 3.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1355622 | |
| Oct 14, 2025 | Zinc, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1355622 | |
| Mar 13, 2025 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1329102 | |
| Mar 13, 2025 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1329102 | |
| Mar 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329102 | |
| Mar 13, 2025 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329102 | |
| Mar 13, 2025 | Total Suspended Solids (TSS) | 3.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329102 | |
| Mar 13, 2025 | Zinc, Total | .023 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1329102 | |
| Mar 06, 2025 | Aluminum, Total | .13 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328573 | |
| Mar 06, 2025 | Iron, Total | .12 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1328573 | |
| Mar 06, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1328573 | |
| Mar 06, 2025 | pH | 6.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1328573 | |
| Mar 06, 2025 | Total Suspended Solids (TSS) | 4.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328573 | |
| Mar 06, 2025 | Zinc, Total | .014 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328573 | |
| Feb 07, 2025 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1324394 | |
| Feb 07, 2025 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1324394 | |
| Feb 07, 2025 | Oil and Grease | DNQ 2.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1324394 | |
| Feb 07, 2025 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1324394 | |
| Feb 07, 2025 | Total Suspended Solids (TSS) | 1.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1324394 | |
| Feb 07, 2025 | Zinc, Total | DNQ .009 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1324394 | |
| Jan 26, 2025 | Aluminum, Total | .03 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1322062 | |
| Jan 26, 2025 | Iron, Total | .069 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1322062 |
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 | 9 | 8 Violation · 0 Potential (preliminary) · 1 Dismissed | Jul 01, 2011 – Dec 20, 2023 | Oct 21, 2026 | All violations |
| Enforcement actions | 6 | 6 issued · 0 draft · 0 withdrawn, rescinded or superseded | Aug 10, 2012 – Dec 20, 2023 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Dec 15, 2021 – Dec 15, 2021 | 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 | 1 | reports, by parameter | 2021-22 – 2021-22 | Oct 21, 2026 | All reports |
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 (28 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 13, 2026 | Annual reports | 1334753 | Annual report 2025 | — | |
| Jun 25, 2025 | Annual reports | 1293547 | Annual report 2024 | — | |
| Sep 10, 2024 | Water-quality-based corrective action reports | 1302797 | WQBCAR 2021-22 | — | Zinc, Total |
| Jul 03, 2024 | Annual reports | 1242584 | Annual report 2023 | — | |
| Dec 20, 2023 | Enforcement actions | 452515 | ACL (Administrative Civil Liability) | Historical | R4-2023-0392 |
| Dec 20, 2023 | Violations | 887655 | Effluent | Violation | Report |
| Dec 20, 2023 | Violations | 887656 | Late Report | Violation | Report |
| Jul 14, 2023 | Annual reports | 1188560 | Annual report 2022 | — | |
| Jul 11, 2022 | Annual reports | 1111869 | Annual report 2021 | — | |
| Dec 15, 2021 | Inspections | 2056945 | B Type compliance | Finalized | No Further Action |
| Jul 07, 2021 | Annual reports | 1067843 | Annual report 2020 | — | |
| Feb 12, 2021 | Enforcement actions | 440019 | NOV (Notice of Violation) | Historical | |
| Jan 01, 2021 | Violations | 876291 | Late Report | Violation | Report |
| Jul 08, 2020 | Annual reports | 985046 | Annual report 2019 | — | |
| Jul 16, 2019 | Annual reports | 952567 | Annual report 2018 | — | |
| Jul 23, 2018 | Annual reports | 937981 | Annual report 2017 | — | |
| Aug 21, 2017 | Annual reports | 877176 | Annual report 2016 | — | |
| Apr 19, 2017 | Enforcement actions | 425973 | NOV (Notice of Violation) | Historical | |
| Oct 06, 2016 | Annual reports | 845538 | Annual report 2015 | — | |
| Sep 28, 2016 | Enforcement actions | 424428 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Sep 28, 2016 | Violations | 861488 | Late Report | Violation | Report |
| Aug 14, 2015 | Violations | 863056 | Incomplete/Insufficient SWPPP | Violation | Internal Report |
| Feb 27, 2015 | Enforcement actions | 418428 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Jul 01, 2014 | Violations | 856563 | Late Report | Violation | Report |
| Jul 01, 2013 | Violations | 856562 | Late Report | Violation | Report |
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.