Sea Shield Marine Products
Active WDID 4 19I025173 Walnut, 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
- Walnut, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- San Jose Creek (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
- 124 distinct results, 10 reporting years (2015 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 2 inspections · 2 violation records · 1 enforcement action
- 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
- 34.00786, -117.85019
- 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
- 20832 Currier Road, Walnut 91789
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Upper San Jose Creek HUC12 180701060501
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
- Sea Shield Marine Products
- Primary industry (SIC)
- 3364-Nonferrous Die-Castings, Except Aluminum
- Secondary SIC
- 3363-Aluminum Die-Castings
- Application ID
- 451321
- NOI processed
- Dec 01, 2014
- Last certified
- Jun 11, 2015
- Facility size
- 48000 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 |
|---|---|---|---|---|---|
| 451321 | Industrial | Active | Dec 01, 2014 | — | Jun 11, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- San Jose Creek
- 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
5 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 |
|---|---|---|---|
| San Jose Creek Reach 1 (SG Confluence to Temple St.) CAR4053100019980918090950 | 547 m | listed | 5 |
Waterbodies within 1.0 km of the reported facility location. Method proximity/1.
SMARTS TMDL records Evidence: SMARTS-reported
No TMDL records for this facility in the SMARTS TMDL export.
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.
124 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 | 18 | 6 | 0 | Oct 14, 2025 | Feb 16, 2026 |
| 2024 | 6 | 6 | 0 | Feb 13, 2025 | Feb 13, 2025 |
| 2023 | 10 | 6 | 0 | Feb 01, 2024 | Feb 19, 2024 |
| 2022 | 18 | 6 | 0 | Nov 08, 2022 | Mar 14, 2023 |
| 2021 | 12 | 6 | 0 | Dec 14, 2021 | Mar 28, 2022 |
| 2020 | 6 | 6 | 0 | Mar 03, 2021 | Mar 03, 2021 |
| 2019 | 12 | 6 | 0 | Nov 27, 2019 | Mar 10, 2020 |
| 2018 | 12 | 6 | 0 | Nov 29, 2018 | May 16, 2019 |
| 2016 | 18 | 6 | 0 | Dec 21, 2016 | Feb 06, 2017 |
| 2015 | 12 | 6 | 0 | Dec 11, 2015 | Jan 05, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 21 | 9 | Dec 11, 2015 | Feb 16, 2026 | Results |
| pH | SU | 21 | 0 | Dec 11, 2015 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 21 | 14 | Dec 11, 2015 | Feb 16, 2026 | Results |
| Zinc, Total | mg/L | 21 | 1 | Dec 11, 2015 | Feb 16, 2026 | Results |
| Aluminum, Total | mg/L | 20 | 7 | Dec 11, 2015 | Feb 16, 2026 | Results |
| Copper, Total | mg/L | 20 | 4 | Dec 11, 2015 | Feb 16, 2026 | Results |
All results (124 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Aluminum, Total | .124 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1369064 | |
| Feb 16, 2026 | Copper, Total | .0025 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1369064 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1369064 | |
| Feb 16, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1369064 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1369064 | |
| Feb 16, 2026 | Zinc, Total | .152 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1369064 | |
| Nov 14, 2025 | Aluminum, Total | .0208 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1363538 | |
| Nov 14, 2025 | Copper, Total | .0024 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1363538 | |
| Nov 14, 2025 | Oil and Grease | 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1363538 | |
| Nov 14, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1363538 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363538 | |
| Nov 14, 2025 | Zinc, Total | .196 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1363538 | |
| Oct 14, 2025 | Aluminum, Total | .105 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1363534 | |
| Oct 14, 2025 | Copper, Total | .0043 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1363534 | |
| Oct 14, 2025 | Oil and Grease | 15 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1363534 | |
| Oct 14, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1363534 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363534 | |
| Oct 14, 2025 | Zinc, Total | .18 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1363534 | |
| Feb 13, 2025 | Aluminum, Total | .0789 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330917 | |
| Feb 13, 2025 | Copper, Total | .0052 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330917 | |
| Feb 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1330917 | |
| Feb 13, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1330917 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1330917 | |
| Feb 13, 2025 | Zinc, Total | 1.34 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330917 | |
| Feb 19, 2024 | Aluminum, Total | .0114 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1285960 | |
| Feb 19, 2024 | Copper, Total | .0015 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1285960 | |
| Feb 19, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1285960 | |
| Feb 19, 2024 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1285960 | |
| Feb 19, 2024 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1285960 | |
| Feb 19, 2024 | Zinc, Total | .0312 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1285960 | |
| Feb 01, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1283952 | |
| Feb 01, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1283952 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1283952 | |
| Feb 01, 2024 | Zinc, Total | .034 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1283952 | |
| Mar 14, 2023 | Aluminum, Total | .0096 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1238143 | |
| Mar 14, 2023 | Copper, Total | .0018 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1238143 | |
| Mar 14, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1238143 | |
| Mar 14, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1238143 | |
| Mar 14, 2023 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1238143 | |
| Mar 14, 2023 | Zinc, Total | .11 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1238143 | |
| Jan 09, 2023 | Aluminum, Total | .083 | mg/L | Effluent | Qualifying Storm Event | 1238142 | ||
| Jan 09, 2023 | Copper, Total | .0179 | mg/L | Effluent | Qualifying Storm Event | 1238142 | ||
| Jan 09, 2023 | Oil and Grease | 6.9 | mg/L | Effluent | Qualifying Storm Event | 1238142 | ||
| Jan 09, 2023 | pH | 6 | SU | Effluent | Qualifying Storm Event | 1238142 | ||
| Jan 09, 2023 | Total Suspended Solids (TSS) | 5.7 | mg/L | Effluent | Qualifying Storm Event | 1238142 | ||
| Jan 09, 2023 | Zinc, Total | .622 | mg/L | Effluent | Qualifying Storm Event | 1238142 | ||
| Nov 08, 2022 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1218093 | |
| Nov 08, 2022 | Copper, Total | .0096 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1218093 | |
| Nov 08, 2022 | Oil and Grease | 4.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1218093 | |
| Nov 08, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1218093 |
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 | 2 | 2 Violation · 0 Potential (preliminary) · 0 Dismissed | Jun 06, 2017 – Jun 06, 2017 | Oct 21, 2026 | All violations |
| Enforcement actions | 1 | 1 issued · 0 draft · 0 withdrawn, rescinded or superseded | Dec 04, 2017 – Dec 04, 2017 | Oct 21, 2026 | All actions |
| Inspections | 2 | inspections, not findings | Jun 06, 2017 – Sep 19, 2018 | 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 (16 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 07, 2026 | Annual reports | 1339385 | Annual report 2025 | — | |
| Jul 10, 2025 | Annual reports | 1298431 | Annual report 2024 | — | |
| Jul 12, 2024 | Annual reports | 1247715 | Annual report 2023 | — | |
| Jun 30, 2023 | Annual reports | 1193927 | Annual report 2022 | — | |
| Jul 15, 2022 | Annual reports | 1117817 | Annual report 2021 | — | |
| Jul 15, 2021 | Annual reports | 1066059 | Annual report 2020 | — | |
| Jul 13, 2020 | Annual reports | 983186 | Annual report 2019 | — | |
| Jul 15, 2019 | Annual reports | 959561 | Annual report 2018 | — | |
| Sep 19, 2018 | Inspections | 2040623 | B Type compliance | — | No Further Action |
| Jul 13, 2018 | Annual reports | 944992 | Annual report 2017 | — | |
| Dec 04, 2017 | Enforcement actions | 427968 | NOV (Notice of Violation) | Historical | |
| Jul 06, 2017 | Annual reports | 884290 | Annual report 2016 | — | |
| Jun 06, 2017 | Inspections | 2034150 | B Type compliance | — | No Further Action |
| Jun 06, 2017 | Violations | 865023 | Deficient BMP Implementation | Violation | Inspection |
| Jun 06, 2017 | Violations | 865025 | Incomplete/Insufficient SWPPP | Violation | Inspection |
| Jul 13, 2016 | Annual reports | 841522 | 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.