Interplastic Corp
Active WDID 4 19I000862 Hawthorne, 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
- Hawthorne, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Pacific Ovia Dominguez Canal (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
- 1 waterbody; 1 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 214 distinct results, 10 reporting years (2015 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 2 inspections · 5 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
- 33.91913, -118.31773
- Precision
- 5 decimal places
- Shared point
- 2 permits report this exact point
- Matches application record
- same
Facility location as reported by the discharger in SMARTS; not a discharge point or outfall.
- Facility address
- 12335 S Van Ness Ave, Hawthorne 90250
- 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
- Interplastic Corp
- Primary industry (SIC)
- 2821-Plastics Material and Synthetic Resins, and Nonvulcanizable Elastomers
- Application ID
- 188701
- NOI processed
- Mar 23, 1992
- Last certified
- Aug 20, 2026
- Facility size
- 8 Acres
- Impervious area
- 90 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 188701 | Industrial | Active | Mar 23, 1992 | — | Aug 20, 2026 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Pacific Ovia Dominguez Canal
- Discharges directly / indirectly
- N / Y (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.
| Waterbody (2026 Integrated Report) | Distance | 2026 303(d) list | Appendix A decisions |
|---|---|---|---|
| Dominguez Channel (lined portion above Vermont Ave) CAR4051200019980918161017 | 741 m | listed | 6 |
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 |
|---|---|---|---|---|---|---|---|
| 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 and Torrance Lateral Channel | Zinc, Total | .89887 mg/L | TMDL NAL instantaneous | INTERIM | 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.
214 distinct measurements across 6 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 | 24 | 6 | 0 | Oct 14, 2025 | Feb 16, 2026 |
| 2024 | 18 | 6 | 0 | Jan 26, 2025 | Feb 13, 2025 |
| 2023 | 20 | 4 | 0 | Aug 20, 2023 | Jan 20, 2024 |
| 2022 | 32 | 4 | 0 | Oct 12, 2022 | Feb 24, 2023 |
| 2021 | 12 | 4 | 0 | Oct 25, 2021 | Mar 28, 2022 |
| 2020 | 16 | 4 | 0 | Dec 28, 2020 | Mar 03, 2021 |
| 2019 | 28 | 4 | 0 | Nov 20, 2019 | Apr 06, 2020 |
| 2018 | 48 | 4 | 0 | Oct 12, 2018 | May 19, 2019 |
| 2016 | 12 | 4 | 0 | Oct 17, 2016 | Nov 20, 2016 |
| 2015 | 4 | 4 | 0 | Sep 15, 2015 | Sep 15, 2015 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 50 | 11 | Sep 15, 2015 | Feb 16, 2026 | Results |
| pH | SU | 50 | 0 | Sep 15, 2015 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 50 | 0 | Sep 15, 2015 | Feb 16, 2026 | Results |
| Zinc, Total | mg/L | 50 | 0 | Sep 15, 2015 | Feb 16, 2026 | Results |
| Copper, Total | mg/L | 7 | 0 | Jan 26, 2025 | Feb 16, 2026 | Results |
| Iron, Total | mg/L | 7 | 0 | Jan 26, 2025 | Feb 16, 2026 | Results |
All results (214 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Copper, Total | .00488 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1368204 | |
| Feb 16, 2026 | Iron, Total | .331 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1368204 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1368204 | |
| Feb 16, 2026 | pH | 8.2 | SU | Effluent | Qualifying Storm Event | pH_Field | 1368204 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 6.7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1368204 | |
| Feb 16, 2026 | Zinc, Total | .0984 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1368204 | |
| Jan 02, 2026 | Copper, Total | .0031 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1363523 | |
| Jan 02, 2026 | Iron, Total | .237 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1363523 | |
| Jan 02, 2026 | Oil and Grease | 1.8 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1363523 | |
| Jan 02, 2026 | pH | 8.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1363523 | |
| Jan 02, 2026 | Total Suspended Solids (TSS) | 2.7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363523 | |
| Jan 02, 2026 | Zinc, Total | .0631 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1363523 | |
| Nov 20, 2025 | Copper, Total | .00879 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360717 | |
| Nov 20, 2025 | Iron, Total | .813 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360717 | |
| Nov 20, 2025 | Oil and Grease | 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1360717 | |
| Nov 20, 2025 | pH | 8.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1360717 | |
| Nov 20, 2025 | Total Suspended Solids (TSS) | 22.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360717 | |
| Nov 20, 2025 | Zinc, Total | .128 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360717 | |
| Oct 14, 2025 | Copper, Total | .0325 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1354673 | |
| Oct 14, 2025 | Iron, Total | 2.63 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1354673 | |
| Oct 14, 2025 | Oil and Grease | .13 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1354673 | |
| Oct 14, 2025 | pH | 7.6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1354673 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | .058 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1354673 | |
| Oct 14, 2025 | Zinc, Total | .661 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1354673 | |
| Feb 13, 2025 | Copper, Total | .00435 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1332537 | |
| Feb 13, 2025 | Iron, Total | .15 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1332537 | |
| Feb 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1332537 | |
| Feb 13, 2025 | pH | 7.3 | SU | Effluent | Qualifying Storm Event | pH_Field | 1332537 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | 2.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1332537 | |
| Feb 13, 2025 | Zinc, Total | .112 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1332537 | |
| Feb 05, 2025 | Copper, Total | .0118 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1332536 | |
| Feb 05, 2025 | Iron, Total | .396 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1332536 | |
| Feb 05, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1332536 | |
| Feb 05, 2025 | pH | 7.3 | SU | Effluent | Qualifying Storm Event | pH_Field | 1332536 | |
| Feb 05, 2025 | Total Suspended Solids (TSS) | 3.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1332536 | |
| Feb 05, 2025 | Zinc, Total | .1 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1332536 | |
| Jan 26, 2025 | Copper, Total | .0242 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1332534 | |
| Jan 26, 2025 | Iron, Total | 2.35 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1332534 | |
| Jan 26, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1332534 | |
| Jan 26, 2025 | pH | 8.6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1332534 | |
| Jan 26, 2025 | Total Suspended Solids (TSS) | 65.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1332534 | |
| Jan 26, 2025 | Zinc, Total | .317 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1332534 | |
| Jan 20, 2024 | Oil and Grease | 2 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1274951 | |
| Jan 20, 2024 | Oil and Grease | 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1274951 | |
| Jan 20, 2024 | pH | 8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1274951 | |
| Jan 20, 2024 | pH | 8.2 | SU | Effluent | Qualifying Storm Event | pH_Field | 1274951 | |
| Jan 20, 2024 | Total Suspended Solids (TSS) | 58.5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1274951 | |
| Jan 20, 2024 | Total Suspended Solids (TSS) | 32 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1274951 | |
| Jan 20, 2024 | Zinc, Total | .42 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1274951 | |
| Jan 20, 2024 | Zinc, Total | .27 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1274951 |
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 | 5 | 5 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 1999 – Jul 30, 2021 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 3 issued · 0 draft · 0 withdrawn, rescinded or superseded | Aug 25, 2005 – May 05, 2022 | Oct 21, 2026 | All actions |
| Inspections | 2 | inspections, not findings | Apr 20, 2009 – Mar 08, 2011 | 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 | 2 | reports, by parameter | 2020-21 – 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 (23 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 14, 2026 | Annual reports | 1335416 | Annual report 2025 | — | |
| Jul 15, 2025 | Annual reports | 1294230 | Annual report 2024 | — | |
| Jul 15, 2024 | Annual reports | 1243316 | Annual report 2023 | — | |
| Jul 19, 2023 | Annual reports | 1189319 | Annual report 2022 | — | |
| Jun 30, 2022 | Annual reports | 1112698 | Annual report 2021 | — | |
| Jun 30, 2022 | Water-quality-based corrective action reports | 1186343 | WQBCAR 2021-22 | — | Oil and Grease, pH, Total Suspended Solids (TSS), Zinc, Total |
| May 05, 2022 | Enforcement actions | 446500 | NOV (Notice of Violation) | Historical | |
| Dec 31, 2021 | Water-quality-based corrective action reports | 1151082 | WQBCAR 2020-21 | — | Oil and Grease, pH, Total Suspended Solids (TSS), Zinc, Total |
| Jul 30, 2021 | Violations | 881718 | Incomplete/Insufficient SWPPP | Violation | Report |
| Jul 13, 2021 | Annual reports | 1068708 | Annual report 2020 | — | |
| Jul 15, 2020 | Annual reports | 985968 | Annual report 2019 | — | |
| Jun 27, 2019 | Annual reports | 953522 | Annual report 2018 | — | |
| Jun 21, 2018 | Annual reports | 938938 | Annual report 2017 | — | |
| Jul 13, 2017 | Annual reports | 878179 | Annual report 2016 | — | |
| Jul 06, 2016 | Annual reports | 840912 | Annual report 2015 | — | |
| Mar 08, 2011 | Inspections | 2010843 | Non-compliance Follow-up | — | No Further Action |
| Jul 19, 2010 | Enforcement actions | 404402 | SEL (Staff Enforcement Letter) | Historical | |
| Apr 20, 2009 | Inspections | 1797137 | B Type compliance | — | Follow-up Inspection Needed |
| Dec 22, 2008 | Violations | 843720 | Deficient BMP Implementation | Violation | Report |
| Aug 25, 2005 | Enforcement actions | 306338 | NOV (Notice of Violation) | Historical | NOV |
| Aug 17, 2005 | Violations | 420792 | Deficient BMP Implementation | Violation | Inspection |
| Aug 17, 2005 | Violations | 420793 | Incomplete/Insufficient SWPPP | Violation | Inspection |
| Jul 02, 1999 | Violations | 152845 | Deficient Report | 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.