Roscoe Moss Manufacturing Co
Active WDID 4 19I018587 Los Angeles, 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
- Los Angeles, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Pacific Ocean (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
- None
- Monitoring results Evidence: facility-reported
- 1,044 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Feb 11, 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
- 34.06295, -118.1914
- 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
- 4360 Worth, Los Angeles 90063
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Chavez Ravine-Los Angeles River HUC12 180701050401
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
- Roscoe Moss Manufacturing Company
- Primary industry (SIC)
- 3317-Steel Pipe and Tubes
- Secondary SIC
- 3496-Miscellaneous Fabricated Wire Products
- Tertiary SIC
- 3499-Fabricated Metal Products, NEC
- Application ID
- 191667
- NOI processed
- Jan 15, 2004
- Last certified
- Jun 09, 2026
- Facility size
- 176476 SqFt
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 191667 | Industrial | Active | Jan 15, 2004 | — | Jun 09, 2026 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Pacific Ocean
- 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
290 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.
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 |
|---|---|---|---|---|---|---|---|
| Los Angeles River Nitrogen TMDL | Los Angeles River Watershed | Nitrite Plus Nitrate (as N) | 8 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
1 record. 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.
1,044 distinct measurements across 8 parameters, most recent sample Feb 11, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 70 | 7 | 0 | Nov 21, 2025 | Feb 11, 2026 |
| 2024 | 35 | 7 | 0 | Mar 06, 2025 | Mar 06, 2025 |
| 2023 | 98 | 7 | 0 | Dec 20, 2023 | Apr 01, 2024 |
| 2022 | 140 | 7 | 0 | Dec 05, 2022 | Jan 31, 2023 |
| 2021 | 63 | 7 | 0 | Oct 26, 2021 | Dec 15, 2021 |
| 2020 | 105 | 7 | 0 | Dec 28, 2020 | Mar 15, 2021 |
| 2019 | 70 | 7 | 0 | Nov 20, 2019 | Dec 23, 2019 |
| 2018 | 133 | 7 | 0 | Nov 29, 2018 | May 20, 2019 |
| 2017 | 70 | 7 | 0 | Jan 09, 2018 | Mar 15, 2018 |
| 2016 | 140 | 7 | 0 | Oct 31, 2016 | Feb 06, 2017 |
| 2015 | 120 | 8 | 0 | Sep 15, 2015 | May 06, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Aluminum, Total | mg/L | 147 | 9 | Sep 15, 2015 | Feb 11, 2026 | Results |
| Iron, Total | mg/L | 147 | 16 | Sep 15, 2015 | Feb 11, 2026 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 147 | 19 | Sep 15, 2015 | Feb 11, 2026 | Results |
| Oil and Grease | mg/L | 147 | 58 | Sep 15, 2015 | Feb 11, 2026 | Results |
| pH | SU | 147 | 0 | Sep 15, 2015 | Feb 11, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 147 | 29 | Sep 15, 2015 | Feb 11, 2026 | Results |
| Zinc, Total | mg/L | 147 | 0 | Sep 15, 2015 | Feb 11, 2026 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 15 | 0 | Sep 15, 2015 | May 06, 2016 | Results |
All results (1,044 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 11, 2026 | Aluminum, Total | .0362 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370878 | |
| Feb 11, 2026 | Aluminum, Total | .0271 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370878 | |
| Feb 11, 2026 | Aluminum, Total | .0192 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370878 | |
| Feb 11, 2026 | Aluminum, Total | .0413 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370878 | |
| Feb 11, 2026 | Aluminum, Total | .0269 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370878 | |
| Feb 11, 2026 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370878 | |
| Feb 11, 2026 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370878 | |
| Feb 11, 2026 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370878 | |
| Feb 11, 2026 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370878 | |
| Feb 11, 2026 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370878 | |
| Feb 11, 2026 | Nitrite Plus Nitrate (as N) | .138 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370878 | |
| Feb 11, 2026 | Nitrite Plus Nitrate (as N) | .168 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370878 | |
| Feb 11, 2026 | Nitrite Plus Nitrate (as N) | .0924 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370878 | |
| Feb 11, 2026 | Nitrite Plus Nitrate (as N) | .103 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370878 | |
| Feb 11, 2026 | Nitrite Plus Nitrate (as N) | .225 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370878 | |
| Feb 11, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1370878 | |
| Feb 11, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1370878 | |
| Feb 11, 2026 | Oil and Grease | 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1370878 | |
| Feb 11, 2026 | Oil and Grease | 2.9 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1370878 | |
| Feb 11, 2026 | Oil and Grease | 4.8 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1370878 | |
| Feb 11, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1370878 | |
| Feb 11, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1370878 | |
| Feb 11, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1370878 | |
| Feb 11, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1370878 | |
| Feb 11, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1370878 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | 2.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370878 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | 3.5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370878 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | 5.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370878 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | 7.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370878 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | 10.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370878 | |
| Feb 11, 2026 | Zinc, Total | .0332 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370878 | |
| Feb 11, 2026 | Zinc, Total | .0247 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370878 | |
| Feb 11, 2026 | Zinc, Total | .0127 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370878 | |
| Feb 11, 2026 | Zinc, Total | .0178 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370878 | |
| Feb 11, 2026 | Zinc, Total | .0162 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1370878 | |
| Nov 21, 2025 | Aluminum, Total | .229 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365342 | |
| Nov 21, 2025 | Aluminum, Total | .236 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365342 | |
| Nov 21, 2025 | Aluminum, Total | .189 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365342 | |
| Nov 21, 2025 | Aluminum, Total | .293 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365342 | |
| Nov 21, 2025 | Aluminum, Total | .343 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365342 | |
| Nov 21, 2025 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1365342 | |
| Nov 21, 2025 | Iron, Total | .057 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1365342 | |
| Nov 21, 2025 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1365342 | |
| Nov 21, 2025 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1365342 | |
| Nov 21, 2025 | Iron, Total | .103 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1365342 | |
| Nov 21, 2025 | Nitrite Plus Nitrate (as N) | .118 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1365342 | |
| Nov 21, 2025 | Nitrite Plus Nitrate (as N) | .14 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1365342 | |
| Nov 21, 2025 | Nitrite Plus Nitrate (as N) | 1.59 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1365342 | |
| Nov 21, 2025 | Nitrite Plus Nitrate (as N) | .273 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1365342 | |
| Nov 21, 2025 | Nitrite Plus Nitrate (as N) | .118 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1365342 |
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 | 3 Violation · 0 Potential (preliminary) · 0 Dismissed | Sep 25, 2008 – May 19, 2026 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 2 issued · 0 draft · 1 withdrawn, rescinded or superseded | Sep 25, 2008 – May 19, 2026 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Sep 25, 2008 – Sep 25, 2008 | 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 |
|---|---|---|---|---|---|
| Jul 07, 2026 | Annual reports | 1337021 | Annual report 2025 | — | |
| May 19, 2026 | Enforcement actions | 469912 | EPL (Expedited Payment Letter) | Withdrawn | R4-2026-0063 |
| May 19, 2026 | Violations | 903987 | Late Report | Violation | Report |
| Jun 27, 2025 | Annual reports | 1295911 | Annual report 2024 | — | |
| Jun 30, 2024 | Annual reports | 1245087 | Annual report 2023 | — | |
| Jul 13, 2023 | Annual reports | 1191175 | Annual report 2022 | — | |
| Jul 13, 2022 | Annual reports | 1114711 | Annual report 2021 | — | |
| Jun 08, 2021 | Annual reports | 1070809 | Annual report 2020 | — | |
| Jul 08, 2020 | Annual reports | 988230 | Annual report 2019 | — | |
| Jul 12, 2019 | Annual reports | 955865 | Annual report 2018 | — | |
| Jul 11, 2018 | Annual reports | 941289 | Annual report 2017 | — | |
| Jul 12, 2017 | Annual reports | 880665 | Annual report 2016 | — | |
| Jul 14, 2016 | Annual reports | 842500 | Annual report 2015 | — | |
| May 25, 2010 | Enforcement actions | 403772 | SEL (Staff Enforcement Letter) | Historical | |
| Feb 05, 2009 | Violations | 843393 | Deficient BMP Implementation | Violation | Report |
| Sep 25, 2008 | Enforcement actions | 354139 | NTC (Notice to Comply) | Historical | Field NTC |
| Sep 25, 2008 | Inspections | 1504366 | B Type compliance | — | Additional Info Required |
| Sep 25, 2008 | Violations | 791249 | Deficient BMP Implementation | 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.