MacSmith Corporation
Active WDID 4 19I029072 Gardena, 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
- Gardena, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Dominguez Channel (lined portion above Vermont Ave) (as reported by the facility)
- Evidence: identification corroborated Dominguez Channel (lined portion above Vermont Ave) Details
- Identified receiving water on the 2026 303(d) list
- Yes · 6 Appendix A decisions, category 5 Evidence: State-published
- Describes the waterbody, not this facility · Waterbody profile
- 2026 Integrated Report waters within 1.0 km Evidence: geographic proximity
- None
- Monitoring results Evidence: facility-reported
- 70 distinct results, 5 reporting years (2021 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 0 inspections · 0 violation records · 0 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
- 33.91505, -118.3046
- 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
- 1563 W 130th Street, Gardena 90249
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Upper Dominguez Channel HUC12 180701060101
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
- MacSmith Corporation
- Primary industry (SIC)
- 3469-Metal Stamping, NEC
- Application ID
- 530855
- NOI processed
- Feb 11, 2021
- Last certified
- Jan 25, 2021
- Facility size
- 0.88 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 530855 | Industrial | Active | Feb 11, 2021 | — | Jan 25, 2021 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Dominguez Channel (lined portion above Vermont Ave)
- Discharges directly / indirectly
- Y / N (as answered in the permit application)
Evidence: identification corroborated Dominguez Channel (lined portion above Vermont Ave) CAR4051200019980918161017
Receiving water reported by facility — waterbody identification corroborated by geographic evidence.
Nearest distance from the reported facility location: 2.0 km. Method receiving_water/2.
2026 Integrated Report status Evidence: State-published
Dominguez Channel (lined portion above Vermont Ave) is on the 2026 Clean Water Act section 303(d) list (6 Appendix A decisions; category 5).
| Pollutant | Category | Listing decision | TMDL requirement | Decision ID |
|---|---|---|---|---|
| Aluminum | 5 | List on 303(d) list (TMDL required list) | 5A | 153898 |
| Copper | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Dominguez, LA/LB Harbors, San Pedro Bay Metals (75 & 78), toxics(73a) and PAHs (74) | 72474 |
| Indicator Bacteria | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 68243 |
| Lead | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Dominguez, LA/LB Harbors, San Pedro Bay Metals (75 & 78), toxics(73a) and PAHs (74) | 98867 |
| Toxicity | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Dominguez, LA/LB Harbors, San Pedro Bay Metals (75 & 78), toxics(73a) and PAHs (74) | 76424 |
| Zinc | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Dominguez, LA/LB Harbors, San Pedro Bay Metals (75 & 78), toxics(73a) and PAHs (74) | 68450 |
Published by the State Water Resources Control Board (2026 California Integrated Report, Appendix A). Listing status is taken from Appendix A only. State Board adoption 2026-02-03; USEPA approval not confirmed. A listing describes the waterbody, not this facility. Waterbody profile.
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 |
|---|---|---|---|---|---|---|---|
| R4 - Los Angeles and Long Beach Harbor Waters TMDL | Dominguez Channel and Torrance Lateral Channel | Zinc, Total | .0697 mg/L | NEL instantaneous | FINAL | 2032-05-05 | Y |
| R4 - Los Angeles and Long Beach Harbor Waters TMDL | Dominguez Channel Estuary | Zinc, Total | .095 mg/L | TMDL NAL instantaneous | FINAL | 2032-05-05 | Y |
| R4 - Los Angeles and Long Beach Harbor Waters TMDL | Dominguez Channel and Torrance Lateral Channel | Zinc, Total | .89887 mg/L | TMDL NAL instantaneous | INTERIM | 2020-07-01 | Y |
3 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.
70 distinct measurements across 7 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 | 21 | 7 | 0 | Oct 14, 2025 | Feb 16, 2026 |
| 2024 | 7 | 7 | 0 | Feb 13, 2025 | Feb 13, 2025 |
| 2023 | 21 | 7 | 0 | Feb 20, 2024 | Mar 30, 2024 |
| 2022 | 14 | 7 | 0 | Nov 08, 2022 | Feb 24, 2023 |
| 2021 | 7 | 7 | 0 | Mar 28, 2022 | Mar 28, 2022 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Aluminum, Total | mg/L | 10 | 5 | Mar 28, 2022 | Feb 16, 2026 | Results |
| Iron, Total | mg/L | 10 | 5 | Mar 28, 2022 | Feb 16, 2026 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 10 | 7 | Mar 28, 2022 | Feb 16, 2026 | Results |
| Oil and Grease | mg/L | 10 | 10 | Mar 28, 2022 | Feb 16, 2026 | Results |
| pH | SU | 10 | 0 | Mar 28, 2022 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 10 | 4 | Mar 28, 2022 | Feb 16, 2026 | Results |
| Zinc, Total | mg/L | 10 | 2 | Mar 28, 2022 | Feb 16, 2026 | Results |
All results (70 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Aluminum, Total | ND 0 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1368720 | |
| Feb 16, 2026 | Iron, Total | DNQ .09 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1368720 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | DNQ .085 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1368720 | |
| Feb 16, 2026 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1368720 | |
| Feb 16, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1368720 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | ND 0 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1368720 | |
| Feb 16, 2026 | Zinc, Total | DNQ .047 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1368720 | |
| Nov 14, 2025 | Aluminum, Total | .23 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360563 | |
| Nov 14, 2025 | Iron, Total | .2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1360563 | |
| Nov 14, 2025 | Nitrite Plus Nitrate (as N) | DNQ .078 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1360563 | |
| Nov 14, 2025 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1360563 | |
| Nov 14, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1360563 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | 3.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360563 | |
| Nov 14, 2025 | Zinc, Total | .13 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360563 | |
| Oct 14, 2025 | Aluminum, Total | DNQ .038 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1355403 | |
| Oct 14, 2025 | Iron, Total | DNQ .05 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1355403 | |
| Oct 14, 2025 | Nitrite Plus Nitrate (as N) | DNQ .14 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1355403 | |
| Oct 14, 2025 | Oil and Grease | DNQ 2.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1355403 | |
| Oct 14, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1355403 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 26 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1355403 | |
| Oct 14, 2025 | Zinc, Total | .092 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1355403 | |
| Feb 13, 2025 | Aluminum, Total | DNQ .033 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1325328 | |
| Feb 13, 2025 | Iron, Total | DNQ .073 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1325328 | |
| Feb 13, 2025 | Nitrite Plus Nitrate (as N) | DNQ .1 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1325328 | |
| Feb 13, 2025 | Oil and Grease | DNQ 1.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1325328 | |
| Feb 13, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1325328 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | ND 0 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1325328 | |
| Feb 13, 2025 | Zinc, Total | .059 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1325328 | |
| Mar 30, 2024 | Aluminum, Total | ND 0 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1284544 | |
| Mar 30, 2024 | Iron, Total | ND 0 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1284544 | |
| Mar 30, 2024 | Nitrite Plus Nitrate (as N) | DNQ .054 | mg/L | Effluent | Qualifying Storm Event | A4500HB | 1284544 | |
| Mar 30, 2024 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1284544 | |
| Mar 30, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1284544 | |
| Mar 30, 2024 | Total Suspended Solids (TSS) | ND 0 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1284544 | |
| Mar 30, 2024 | Zinc, Total | DNQ .0337 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1284544 | |
| Mar 06, 2024 | Aluminum, Total | .09 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1282720 | |
| Mar 06, 2024 | Iron, Total | .11 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1282720 | |
| Mar 06, 2024 | Nitrite Plus Nitrate (as N) | ND 0 | mg/L | Effluent | Qualifying Storm Event | A4500HB | 1282720 | |
| Mar 06, 2024 | Oil and Grease | DNQ 3.1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1282720 | |
| Mar 06, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1282720 | |
| Mar 06, 2024 | Total Suspended Solids (TSS) | 2.1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1282720 | |
| Mar 06, 2024 | Zinc, Total | .062 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1282720 | |
| Feb 20, 2024 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1277586 | |
| Feb 20, 2024 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1277586 | |
| Feb 20, 2024 | Nitrite Plus Nitrate (as N) | 1.6 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1277586 | |
| Feb 20, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1277586 | |
| Feb 20, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1277586 | |
| Feb 20, 2024 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1277586 | |
| Feb 20, 2024 | Zinc, Total | .059 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1277586 | |
| Feb 24, 2023 | Aluminum, Total | .14 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1232515 |
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 | 0 | 0 Violation · 0 Potential (preliminary) · 0 Dismissed | — | Oct 21, 2026 | |
| Enforcement actions | 0 | 0 issued · 0 draft · 0 withdrawn, rescinded or superseded | — | Oct 21, 2026 | |
| Inspections | 0 | inspections, not findings | — | Oct 21, 2026 | |
| Annual reports | 6 | certified reports (contents not shown) | 2020 – 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 (6 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 08, 2026 | Annual reports | 1340967 | Annual report 2025 | — | |
| Jun 16, 2025 | Annual reports | 1300141 | Annual report 2024 | — | |
| Jun 17, 2024 | Annual reports | 1249537 | Annual report 2023 | — | |
| Jun 15, 2023 | Annual reports | 1195867 | Annual report 2022 | — | |
| Jun 06, 2022 | Annual reports | 1157266 | Annual report 2021 | — | |
| Jul 13, 2021 | Annual reports | 1141735 | Annual report 2020 | — |
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.