Magnesium Alloy Product Co
Active WDID 4 19I004719 Compton, 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
- Compton, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Pacific Ocean (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
- 1 waterbody; 0 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 252 distinct results, 10 reporting years (2016 to 2025)
- Most recent sample Feb 17, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 2 inspections · 6 violation records · 5 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
- 33.91373, -118.22265
- Precision
- 5 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
- 2420 N Alameda St, Compton 90222
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Compton Creek-Los Angeles River HUC12 180701050402
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
- Magnesium Alloy Product Co
- Primary industry (SIC)
- 3369-Nonferrous Foundries, Except Aluminum and Copper
- Application ID
- 189412
- NOI processed
- Apr 07, 1992
- Last certified
- Dec 15, 2025
- Facility size
- 180000 SqFt
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 189412 | Industrial | Active | Apr 07, 1992 | — | Dec 15, 2025 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Pacific Ocean
- 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
290 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.
| Waterbody (2026 Integrated Report) | Distance | 2026 303(d) list | Appendix A decisions |
|---|---|---|---|
| Compton Creek, unnamed tributary at Santa Fe Rd CAR4051501020110225144256 | 508 m | not listed | 0 |
Waterbodies within 1.0 km of the reported facility location. Method proximity/1.
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 | Copper, Total | .06749 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| 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 |
2 records. 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.
252 distinct measurements across 8 parameters, most recent sample Feb 17, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 14 | 7 | 0 | Oct 14, 2025 | Feb 17, 2026 |
| 2024 | 6 | 6 | 0 | Feb 13, 2025 | Feb 13, 2025 |
| 2023 | 14 | 7 | 0 | Feb 01, 2024 | Feb 19, 2024 |
| 2022 | 28 | 7 | 0 | Nov 09, 2022 | Mar 29, 2023 |
| 2021 | 21 | 7 | 0 | Oct 25, 2021 | Mar 28, 2022 |
| 2020 | 14 | 7 | 0 | Mar 03, 2021 | Mar 15, 2021 |
| 2019 | 35 | 7 | 0 | Dec 04, 2019 | Dec 04, 2019 |
| 2018 | 59 | 8 | 0 | Dec 06, 2018 | Jan 14, 2019 |
| 2017 | 48 | 8 | 0 | Mar 02, 2018 | Mar 22, 2018 |
| 2016 | 13 | 7 | 0 | Dec 16, 2016 | Feb 06, 2017 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Aluminum, Total | mg/L | 35 | 0 | Dec 16, 2016 | Feb 17, 2026 | Results |
| Magnesium, Total | mg/L | 35 | 0 | Dec 16, 2016 | Feb 17, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 35 | 3 | Dec 16, 2016 | Feb 17, 2026 | Results |
| Zinc, Total | mg/L | 35 | 2 | Dec 16, 2016 | Feb 17, 2026 | Results |
| Copper, Total | mg/L | 34 | 1 | Feb 06, 2017 | Feb 17, 2026 | Results |
| Oil and Grease | mg/L | 34 | 28 | Dec 16, 2016 | Feb 17, 2026 | Results |
| pH | SU | 33 | 0 | Mar 02, 2018 | Feb 17, 2026 | Results |
| Chemical Oxygen Demand (COD) | mg/L | 11 | 0 | Dec 16, 2016 | Dec 06, 2018 | Results |
All results (252 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 17, 2026 | Aluminum, Total | .047 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371127 | |
| Feb 17, 2026 | Copper, Total | .004 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371127 | |
| Feb 17, 2026 | Magnesium, Total | 4.09 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1371127 | |
| Feb 17, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1371127 | |
| Feb 17, 2026 | pH | 6.7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1371127 | |
| Feb 17, 2026 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1371127 | |
| Feb 17, 2026 | Zinc, Total | .018 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371127 | |
| Oct 14, 2025 | Aluminum, Total | 1.1 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358755 | |
| Oct 14, 2025 | Copper, Total | .034 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358755 | |
| Oct 14, 2025 | Magnesium, Total | 22.2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1358755 | |
| Oct 14, 2025 | Oil and Grease | DNQ 4.4 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1358755 | |
| Oct 14, 2025 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1358755 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 32 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1358755 | |
| Oct 14, 2025 | Zinc, Total | .42 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358755 | |
| Feb 13, 2025 | Aluminum, Total | .047 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327174 | |
| Feb 13, 2025 | Copper, Total | .21 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327174 | |
| Feb 13, 2025 | Magnesium, Total | 13.1 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1327174 | |
| Feb 13, 2025 | pH | 6.41 | SU | Effluent | Qualifying Storm Event | A4500HB | 1327174 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1327174 | |
| Feb 13, 2025 | Zinc, Total | .061 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327174 | |
| Feb 19, 2024 | Aluminum, Total | .072 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1282138 | |
| Feb 19, 2024 | Copper, Total | .009 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1282138 | |
| Feb 19, 2024 | Magnesium, Total | 4.59 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1282138 | |
| Feb 19, 2024 | Oil and Grease | DNQ 1.8 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1282138 | |
| Feb 19, 2024 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1282138 | |
| Feb 19, 2024 | Total Suspended Solids (TSS) | 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1282138 | |
| Feb 19, 2024 | Zinc, Total | .019 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1282138 | |
| Feb 01, 2024 | Aluminum, Total | .88 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1281669 | |
| Feb 01, 2024 | Copper, Total | .013 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1281669 | |
| Feb 01, 2024 | Magnesium, Total | 2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1281669 | |
| Feb 01, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1281669 | |
| Feb 01, 2024 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1281669 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 53 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1281669 | |
| Feb 01, 2024 | Zinc, Total | .22 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1281669 | |
| Mar 29, 2023 | Aluminum, Total | .14 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1237394 | |
| Mar 29, 2023 | Copper, Total | .37 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1237394 | |
| Mar 29, 2023 | Magnesium, Total | 14.1 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1237394 | |
| Mar 29, 2023 | Oil and Grease | 1.5 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1237394 | |
| Mar 29, 2023 | pH | 6.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1237394 | |
| Mar 29, 2023 | Total Suspended Solids (TSS) | .4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1237394 | |
| Mar 29, 2023 | Zinc, Total | .66 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1237394 | |
| Feb 27, 2023 | Aluminum, Total | .16 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1234420 | |
| Feb 27, 2023 | Copper, Total | .22 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1234420 | |
| Feb 27, 2023 | Magnesium, Total | 8.83 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1234420 | |
| Feb 27, 2023 | Oil and Grease | 1.2 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1234420 | |
| Feb 27, 2023 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1234420 | |
| Feb 27, 2023 | Total Suspended Solids (TSS) | .7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1234420 | |
| Feb 27, 2023 | Zinc, Total | .39 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1234420 | |
| Jan 05, 2023 | Aluminum, Total | 1.6 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1226927 | |
| Jan 05, 2023 | Copper, Total | .018 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1226927 |
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 | 6 | 5 Violation · 1 Potential (preliminary) · 0 Dismissed | Aug 21, 2013 – Jun 05, 2024 | Oct 21, 2026 | All violations |
| Enforcement actions | 5 | 5 issued · 0 draft · 0 withdrawn, rescinded or superseded | Aug 21, 2013 – Jun 05, 2024 | Oct 21, 2026 | All actions |
| Inspections | 2 | inspections, not findings | Aug 21, 2013 – Aug 30, 2017 | 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 | 2023-24 – 2023-24 | 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 (25 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 14, 2026 | Annual reports | 1335149 | Annual report 2025 | — | |
| Jul 15, 2025 | Annual reports | 1293951 | Annual report 2024 | — | |
| Aug 05, 2024 | Water-quality-based corrective action reports | 1291447 | WQBCAR 2023-24 | — | Copper, Total, Zinc, Total |
| Jul 12, 2024 | Annual reports | 1243028 | Annual report 2023 | — | |
| Jun 05, 2024 | Enforcement actions | 453393 | ACL (Administrative Civil Liability) | Historical | R4-2024-0209 |
| Jun 05, 2024 | Violations | 889067 | Effluent | Violation | Report |
| Jun 05, 2024 | Violations | 889068 | Late Report | Violation | Report |
| Sep 06, 2023 | Enforcement actions | 450860 | ACL (Administrative Civil Liability) | Historical | R4-2023-0143 |
| Jul 17, 2023 | Annual reports | 1189021 | Annual report 2022 | — | |
| Jul 14, 2022 | Annual reports | 1112377 | Annual report 2021 | — | |
| Aug 17, 2021 | Enforcement actions | 441411 | TSO (Time Schedule Order) | Historical | |
| Aug 17, 2021 | Violations | 877483 | Effluent | Potential | Internal Report |
| Jul 13, 2021 | Annual reports | 1068380 | Annual report 2020 | — | |
| Apr 16, 2021 | Violations | 886044 | Late Report | Violation | Report |
| Jul 14, 2020 | Annual reports | 985615 | Annual report 2019 | — | |
| Jul 11, 2019 | Annual reports | 953155 | Annual report 2018 | — | |
| Jul 16, 2018 | Annual reports | 938571 | Annual report 2017 | — | |
| Aug 30, 2017 | Enforcement actions | 426774 | NTC (Notice to Comply) | Historical | |
| Aug 30, 2017 | Inspections | 2034722 | B Type compliance | — | Follow-up Inspection Needed |
| Aug 30, 2017 | Violations | 864000 | Deficient BMP Implementation | Violation | Inspection |
| Jun 06, 2017 | Annual reports | 877795 | Annual report 2016 | — | |
| Sep 08, 2016 | Annual reports | 842193 | Annual report 2015 | — | |
| Aug 21, 2013 | Enforcement actions | 412875 | NTC (Notice to Comply) | Historical | |
| Aug 21, 2013 | Inspections | 2019573 | B Type compliance | — | Follow-up Inspection Needed |
| Aug 21, 2013 | Violations | 851558 | Deficient BMP Implementation | Violation | Inspection |
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.