Expanded Rubber and Plastics Corporation
Active WDID 4 19I029561 Rancho Dominguez, 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
- Rancho Dominguez, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Dominguez Channel Estuary (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; 1 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 91 distinct results, 4 reporting years (2021 to 2025)
- Most recent sample Feb 19, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 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
- 33.85706, -118.21879
- 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
- 19200 Laurel Park Road, Rancho Dominguez 90220
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Lower Dominguez Channel HUC12 180701060102
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
- Expanded Rubber and Plastics Corporation
- Primary industry (SIC)
- 3087-Custom Compounding of Purchased Plastics Resins
- Application ID
- 541771
- NOI processed
- Dec 23, 2021
- Last certified
- Dec 22, 2021
- Facility size
- 101050 SqFt
- Impervious area
- 99 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 541771 | Industrial | Active | Dec 23, 2021 | — | Dec 22, 2021 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Dominguez Channel Estuary
- Discharges directly / indirectly
- Y / N (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
1 official waterbody shares 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 CAR4051501019990202111430 | 409 m | listed | 8 |
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 Estuary | Copper, Total | .0058 mg/L | TMDL NAL instantaneous | FINAL | 2032-05-05 | Y |
| R4 - Los Angeles and Long Beach Harbor Waters TMDL | Dominguez Channel Estuary | Lead, Total | .221 mg/L | TMDL NAL 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 |
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.
91 distinct measurements across 12 parameters, most recent sample Feb 19, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 37 | 10 | 0 | Nov 14, 2025 | Feb 19, 2026 |
| 2024 | 18 | 9 | 0 | Feb 12, 2025 | Mar 14, 2025 |
| 2023 | 26 | 11 | 0 | Dec 21, 2023 | Feb 05, 2024 |
| 2021 | 10 | 10 | 0 | Oct 25, 2021 | Oct 25, 2021 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Copper, Total | mg/L | 10 | 0 | Oct 25, 2021 | Feb 19, 2026 | Results |
| Lead, Total | mg/L | 10 | 2 | Oct 25, 2021 | Feb 19, 2026 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 10 | 3 | Oct 25, 2021 | Feb 19, 2026 | Results |
| Oil and Grease | mg/L | 10 | 9 | Oct 25, 2021 | Feb 19, 2026 | Results |
| pH | SU | 10 | 1 | Oct 25, 2021 | Feb 19, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 10 | 1 | Oct 25, 2021 | Feb 19, 2026 | Results |
| Zinc, Total | mg/L | 10 | 0 | Oct 25, 2021 | Feb 19, 2026 | Results |
| Cadmium, Total Recoverable | ug/L | 8 | 7 | Oct 25, 2021 | Feb 19, 2026 | Results |
| Polynuclear Aromatic Hydrocarbons (PAHs) | ug/L | 7 | 6 | Oct 25, 2021 | Feb 19, 2026 | Results |
| Aluminum, Total Recoverable | ug/L | 3 | 1 | Oct 25, 2021 | Feb 16, 2026 | Results |
| Cadmium, Total | mg/L | 2 | 1 | Jan 20, 2024 | Feb 05, 2024 | Results |
| Nitrate, Total (as N) | mg/L | 1 | 0 | Dec 21, 2023 | Dec 21, 2023 | Results |
All results (91 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 19, 2026 | Cadmium, Total Recoverable | < .0012 | ug/L | Effluent | Qualifying Storm Event | E200.8 | 1370687 | |
| Feb 19, 2026 | Copper, Total | .0059 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370687 | |
| Feb 19, 2026 | Lead, Total | .0018 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370687 | |
| Feb 19, 2026 | Nitrite Plus Nitrate (as N) | < .04 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1370687 | |
| Feb 19, 2026 | Oil and Grease | < 5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1370687 | |
| Feb 19, 2026 | pH | ND | SU | Effluent | Qualifying Storm Event | pH_Field | 1370687 | |
| Feb 19, 2026 | Polynuclear Aromatic Hydrocarbons (PAHs) | < .5 | ug/L | Effluent | Qualifying Storm Event | 1370687 | ||
| Feb 19, 2026 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370687 | |
| Feb 19, 2026 | Zinc, Total | .0342 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370687 | |
| Feb 16, 2026 | Aluminum, Total Recoverable | ND | ug/L | Effluent | Qualifying Storm Event | E200.8 | 1374425 | |
| Feb 16, 2026 | Cadmium, Total Recoverable | < .0012 | ug/L | Effluent | Qualifying Storm Event | E200.8 | 1374425 | |
| Feb 16, 2026 | Copper, Total | .0067 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1374425 | |
| Feb 16, 2026 | Lead, Total | .0035 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1374425 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | < .04 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1374425 | |
| Feb 16, 2026 | Oil and Grease | < 5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1374425 | |
| Feb 16, 2026 | pH | 7.2 | SU | Effluent | Qualifying Storm Event | pH_Field | 1374425 | |
| Feb 16, 2026 | Polynuclear Aromatic Hydrocarbons (PAHs) | > .5 | ug/L | Effluent | Qualifying Storm Event | E625.1 | 1374425 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 14 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1374425 | |
| Feb 16, 2026 | Zinc, Total | .056 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1374425 | |
| Dec 24, 2025 | Cadmium, Total Recoverable | DNQ 5 | ug/L | Effluent | Qualifying Storm Event | E200.8 | 1365612 | |
| Dec 24, 2025 | Copper, Total | .0056 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365612 | |
| Dec 24, 2025 | Lead, Total | .0032 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365612 | |
| Dec 24, 2025 | Nitrite Plus Nitrate (as N) | .24 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365612 | |
| Dec 24, 2025 | Oil and Grease | DNQ 5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1365612 | |
| Dec 24, 2025 | pH | 7.2 | SU | Effluent | Qualifying Storm Event | pH_Field | 1365612 | |
| Dec 24, 2025 | Polynuclear Aromatic Hydrocarbons (PAHs) | ND .5 | ug/L | Effluent | Qualifying Storm Event | 1365612 | ||
| Dec 24, 2025 | Total Suspended Solids (TSS) | 58 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1365612 | |
| Dec 24, 2025 | Zinc, Total | .0826 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365612 | |
| Nov 14, 2025 | Cadmium, Total Recoverable | ND .0012 | ug/L | Effluent | Qualifying Storm Event | E200.8 | 1364564 | |
| Nov 14, 2025 | Copper, Total | .0067 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1364564 | |
| Nov 14, 2025 | Lead, Total | .0021 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1364564 | |
| Nov 14, 2025 | Nitrite Plus Nitrate (as N) | .27 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1364564 | |
| Nov 14, 2025 | Oil and Grease | 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1364564 | |
| Nov 14, 2025 | pH | 7.2 | SU | Effluent | Qualifying Storm Event | pH_Field | 1364564 | |
| Nov 14, 2025 | Polynuclear Aromatic Hydrocarbons (PAHs) | ND | ug/L | Effluent | Qualifying Storm Event | 1364564 | ||
| Nov 14, 2025 | Total Suspended Solids (TSS) | 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1364564 | |
| Nov 14, 2025 | Zinc, Total | .0524 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1364564 | |
| Mar 14, 2025 | Cadmium, Total Recoverable | DNQ .0001 | ug/L | Effluent | Qualifying Storm Event | E200.8 | 1331190 | |
| Mar 14, 2025 | Copper, Total | .0143 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1331190 | |
| Mar 14, 2025 | Lead, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1331190 | |
| Mar 14, 2025 | Nitrite Plus Nitrate (as N) | .43 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1331190 | |
| Mar 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1331190 | |
| Mar 14, 2025 | pH | 7.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 1331190 | |
| Mar 14, 2025 | Polynuclear Aromatic Hydrocarbons (PAHs) | ND | ug/L | Effluent | Qualifying Storm Event | 1331190 | ||
| Mar 14, 2025 | Total Suspended Solids (TSS) | 18 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1331190 | |
| Mar 14, 2025 | Zinc, Total | .072 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1331190 | |
| Feb 12, 2025 | Cadmium, Total Recoverable | ND | ug/L | Effluent | Qualifying Storm Event | E200.8 | 1331187 | |
| Feb 12, 2025 | Copper, Total | .0155 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1331187 | |
| Feb 12, 2025 | Lead, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1331187 | |
| Feb 12, 2025 | Nitrite Plus Nitrate (as N) | .2 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1331187 |
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 | 1 | inspections, not findings | Nov 06, 2025 – Nov 06, 2025 | Oct 21, 2026 | All inspections |
| Annual reports | 5 | certified reports (contents not shown) | 2021 – 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 09, 2026 | Annual reports | 1340357 | Annual report 2025 | — | |
| Nov 06, 2025 | Inspections | 2069418 | B Type compliance | Performed | No Further Action |
| Jul 01, 2025 | Annual reports | 1299485 | Annual report 2024 | — | |
| Jul 12, 2024 | Annual reports | 1248837 | Annual report 2023 | — | |
| Jul 14, 2023 | Annual reports | 1195127 | Annual report 2022 | — | |
| Jun 23, 2022 | Annual reports | 1171916 | Annual report 2021 | — |
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.