Sonic Plating Co
Active WDID 4 19I000033 Santa Fe Springs, 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
- Santa Fe Springs, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Coyote Creek & Tributaries (as reported by the facility)
- Evidence: not confirmed 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
- 205 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 3 violation records · 3 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
- 33.94546, -118.05397
- 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
- 13002 Los Nietos Rd, Santa Fe Springs 90670
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- La Mirada Creek HUC12 180701060602
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
- Sonic Plating Co
- Primary industry (SIC)
- 3471-Electroplating, Plating, Polishing, Anodizing, and Coloring
- Application ID
- 188531
- NOI processed
- Feb 10, 1992
- Last certified
- Jul 14, 2023
- Facility size
- 23750 SqFt
- Impervious area
- 100 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 188531 | Industrial | Active | Feb 10, 1992 | — | Jul 14, 2023 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Coyote Creek & Tributaries
- Discharges directly / indirectly
- Y / N (as answered in the permit application)
Evidence: not confirmed Not matchable to a single waterbody
Receiving-water text as reported by the discharger in SMARTS; no waterbody identification has been confirmed.
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 - San Gabriel River Metals and Selenium TMDL | R4 - Coyote Creek and its tributary/ies | Copper, Total | .027 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| R4 - San Gabriel River Metals and Selenium TMDL | R4 - Coyote Creek and its tributary/ies | Zinc, Total | .158 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.
205 distinct measurements across 9 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 | 27 | 9 | 0 | Oct 14, 2025 | Feb 16, 2026 |
| 2024 | 18 | 9 | 0 | Feb 13, 2025 | Mar 30, 2025 |
| 2023 | 18 | 9 | 0 | Dec 30, 2023 | Feb 19, 2024 |
| 2022 | 18 | 9 | 0 | Dec 27, 2022 | Jan 05, 2023 |
| 2021 | 18 | 9 | 0 | Dec 23, 2021 | Mar 28, 2022 |
| 2020 | 18 | 9 | 0 | Dec 28, 2020 | Mar 15, 2021 |
| 2019 | 18 | 9 | 0 | Dec 04, 2019 | Mar 12, 2020 |
| 2018 | 18 | 9 | 0 | Dec 18, 2018 | Jan 05, 2019 |
| 2017 | 17 | 9 | 0 | Mar 12, 2018 | Mar 22, 2018 |
| 2016 | 19 | 9 | 0 | Dec 16, 2016 | Feb 17, 2017 |
| 2015 | 16 | 8 | 0 | Sep 15, 2015 | Jan 05, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Zinc, Total | mg/L | 24 | 1 | Sep 15, 2015 | Feb 16, 2026 | Results |
| Aluminum, Total | mg/L | 23 | 4 | Sep 15, 2015 | Feb 16, 2026 | Results |
| Iron, Total | mg/L | 23 | 3 | Sep 15, 2015 | Feb 16, 2026 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 23 | 5 | Sep 15, 2015 | Feb 16, 2026 | Results |
| Oil and Grease | mg/L | 23 | 21 | Sep 15, 2015 | Feb 16, 2026 | Results |
| pH | SU | 23 | 1 | Sep 15, 2015 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 23 | 13 | Sep 15, 2015 | Feb 16, 2026 | Results |
| Chromium (Total) | mg/L | 22 | 18 | Sep 15, 2015 | Feb 16, 2026 | Results |
| Copper, Total | mg/L | 21 | 1 | Dec 16, 2016 | Feb 16, 2026 | Results |
All results (205 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Aluminum, Total | .0495 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1368119 | |
| Feb 16, 2026 | Chromium (Total) | < .007 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1368119 | |
| Feb 16, 2026 | Copper, Total | < .0021 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1368119 | |
| Feb 16, 2026 | Iron, Total | < .159 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1368119 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | < .145 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1368119 | |
| Feb 16, 2026 | Oil and Grease | < 2.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1368119 | |
| Feb 16, 2026 | pH | 7.94 | SU | Effluent | Qualifying Storm Event | pH_Field | 1368119 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1368119 | |
| Feb 16, 2026 | Zinc, Total | .0498 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1368119 | |
| Nov 20, 2025 | Aluminum, Total | .144 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361045 | |
| Nov 20, 2025 | Chromium (Total) | < .007 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361045 | |
| Nov 20, 2025 | Copper, Total | .0155 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361045 | |
| Nov 20, 2025 | Iron, Total | .118 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361045 | |
| Nov 20, 2025 | Nitrite Plus Nitrate (as N) | < .145 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1361045 | |
| Nov 20, 2025 | Oil and Grease | < 2.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361045 | |
| Nov 20, 2025 | pH | 6.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 1361045 | |
| Nov 20, 2025 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361045 | |
| Nov 20, 2025 | Zinc, Total | .121 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361045 | |
| Oct 14, 2025 | Aluminum, Total | .119 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357059 | |
| Oct 14, 2025 | Chromium (Total) | < .007 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357059 | |
| Oct 14, 2025 | Copper, Total | .0145 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357059 | |
| Oct 14, 2025 | Iron, Total | .0362 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357059 | |
| Oct 14, 2025 | Nitrite Plus Nitrate (as N) | < .145 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1357059 | |
| Oct 14, 2025 | Oil and Grease | < 2.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1357059 | |
| Oct 14, 2025 | pH | 8.34 | SU | Effluent | Qualifying Storm Event | pH_Field | 1357059 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357059 | |
| Oct 14, 2025 | Zinc, Total | .154 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1357059 | |
| Mar 30, 2025 | Aluminum, Total | < .0285 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1329996 | |
| Mar 30, 2025 | Chromium (Total) | < .007 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1329996 | |
| Mar 30, 2025 | Copper, Total | .016 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1329996 | |
| Mar 30, 2025 | Iron, Total | .0215 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1329996 | |
| Mar 30, 2025 | Nitrite Plus Nitrate (as N) | < .029 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1329996 | |
| Mar 30, 2025 | Oil and Grease | < 2.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329996 | |
| Mar 30, 2025 | pH | 8.4 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329996 | |
| Mar 30, 2025 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329996 | |
| Mar 30, 2025 | Zinc, Total | .0618 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1329996 | |
| Feb 13, 2025 | Aluminum, Total | < .0285 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323274 | |
| Feb 13, 2025 | Chromium (Total) | < .007 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323274 | |
| Feb 13, 2025 | Copper, Total | .008 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323274 | |
| Feb 13, 2025 | Iron, Total | .0391 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323274 | |
| Feb 13, 2025 | Nitrite Plus Nitrate (as N) | < .145 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1323274 | |
| Feb 13, 2025 | Oil and Grease | < 2.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1323274 | |
| Feb 13, 2025 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1323274 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1323274 | |
| Feb 13, 2025 | Zinc, Total | .0434 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323274 | |
| Feb 19, 2024 | Aluminum, Total | < .0285 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280737 | |
| Feb 19, 2024 | Chromium (Total) | < .007 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280737 | |
| Feb 19, 2024 | Copper, Total | .0095 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280737 | |
| Feb 19, 2024 | Iron, Total | .033 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280737 | |
| Feb 19, 2024 | Nitrite Plus Nitrate (as N) | .94 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1280737 |
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 | 3 | 2 Violation · 1 Potential (preliminary) · 0 Dismissed | Aug 17, 2021 – Mar 05, 2025 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 3 issued · 0 draft · 0 withdrawn, rescinded or superseded | Aug 17, 2021 – Mar 05, 2025 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Feb 18, 2020 – Feb 18, 2020 | 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 (18 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jun 23, 2026 | Annual reports | 1335399 | Annual report 2025 | — | |
| Jun 19, 2025 | Annual reports | 1294212 | Annual report 2024 | — | |
| Mar 05, 2025 | Enforcement actions | 455575 | ACL (Administrative Civil Liability) | Historical | R4-2025-0102 |
| Mar 05, 2025 | Violations | 890885 | Late Report | Violation | Report |
| Jul 10, 2024 | Violations | 889257 | Enforcement Action | Potential | Internal Report |
| Jul 09, 2024 | Enforcement actions | 453561 | 13383 Order (Water Code section 13383 order) | Historical | R4-2024-0188 |
| Jun 20, 2024 | Annual reports | 1243298 | Annual report 2023 | — | |
| Jun 27, 2023 | Annual reports | 1189301 | Annual report 2022 | — | |
| Jun 16, 2022 | Annual reports | 1112679 | Annual report 2021 | — | |
| Aug 17, 2021 | Enforcement actions | 441513 | NOV (Notice of Violation) | Historical | |
| Aug 17, 2021 | Violations | 877566 | Incomplete/Insufficient SWPPP | Violation | Report |
| Jul 07, 2021 | Annual reports | 1068689 | Annual report 2020 | — | |
| Jun 30, 2020 | Annual reports | 985949 | Annual report 2019 | — | |
| Feb 18, 2020 | Inspections | 2047020 | B Type compliance | Finalized | No Further Action |
| Jul 01, 2019 | Annual reports | 953503 | Annual report 2018 | — | |
| Jul 14, 2017 | Annual reports | 878158 | Annual report 2016 | — | |
| Jul 12, 2017 | Annual reports | 938919 | Annual report 2017 | — | |
| Feb 20, 2017 | Annual reports | 846928 | 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.