Monogram Aerospace Fasteners
Active WDID 4 19I001761 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
- 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
- 612 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 3 inspections · 12 violation records · 11 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
- 33.98427, -118.14042
- 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
- 3423 Garfield Ave, Los Angeles 90040
- 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
- Monogram Aerospace Fasteners
- Primary industry (SIC)
- 3452-Bolts, Nuts, Screws, Rivets, and Washers
- Application ID
- 188847
- NOI processed
- Mar 30, 1992
- Last certified
- Jun 02, 2015
- Facility size
- 131400 SqFt
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 188847 | Industrial | Active | Mar 30, 1992 | — | Jun 02, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Rio Hondo River
- 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.
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 Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Zinc, Total | .159 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Nitrogen TMDL | Los Angeles River Watershed | Nitrate, Total (as N) | 8 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Nitrogen TMDL | Los Angeles River Watershed | Nitrite Plus Nitrate (as N) | 8 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Nitrogen TMDL | Los Angeles River Watershed | Nitrite, Total (as N) | 1 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
4 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.
612 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 | 81 | 9 | 0 | Oct 14, 2025 | Feb 16, 2026 |
| 2024 | 54 | 9 | 0 | Feb 13, 2025 | Mar 13, 2025 |
| 2023 | 72 | 9 | 0 | Dec 20, 2023 | Feb 01, 2024 |
| 2022 | 54 | 9 | 0 | Nov 08, 2022 | Jan 09, 2023 |
| 2021 | 36 | 9 | 0 | Dec 14, 2021 | Mar 28, 2022 |
| 2020 | 28 | 7 | 0 | Jan 29, 2021 | Mar 15, 2021 |
| 2019 | 28 | 7 | 0 | Nov 27, 2019 | Mar 12, 2020 |
| 2018 | 70 | 7 | 0 | Nov 29, 2018 | May 16, 2019 |
| 2017 | 21 | 7 | 0 | Jan 08, 2018 | Mar 02, 2018 |
| 2016 | 112 | 7 | 0 | Dec 16, 2016 | Feb 17, 2017 |
| 2015 | 56 | 7 | 0 | Jan 05, 2016 | Mar 11, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Aluminum, Total | mg/L | 78 | 2 | Jan 05, 2016 | Feb 16, 2026 | Results |
| Iron, Total | mg/L | 78 | 1 | Jan 05, 2016 | Feb 16, 2026 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 78 | 0 | Jan 05, 2016 | Feb 16, 2026 | Results |
| Oil and Grease | mg/L | 78 | 31 | Jan 05, 2016 | Feb 16, 2026 | Results |
| pH | SU | 78 | 0 | Jan 05, 2016 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 78 | 59 | Jan 05, 2016 | Feb 16, 2026 | Results |
| Zinc, Total | mg/L | 78 | 0 | Jan 05, 2016 | Feb 16, 2026 | Results |
| Nitrate, Total (as N) | mg/L | 33 | 0 | Dec 14, 2021 | Feb 16, 2026 | Results |
| Nitrite, Total (as N) | mg/L | 33 | 19 | Dec 14, 2021 | Feb 16, 2026 | Results |
All results (612 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Aluminum, Total | .195 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370369 | |
| Feb 16, 2026 | Aluminum, Total | < .156 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370371 | |
| Feb 16, 2026 | Iron, Total | .185 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370369 | |
| Feb 16, 2026 | Iron, Total | .067 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370371 | |
| Feb 16, 2026 | Nitrate, Total (as N) | .05 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370369 | |
| Feb 16, 2026 | Nitrate, Total (as N) | .16 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370371 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | .05 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370369 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | .16 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370371 | |
| Feb 16, 2026 | Nitrite, Total (as N) | < .03 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370369 | |
| Feb 16, 2026 | Nitrite, Total (as N) | < .03 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370371 | |
| Feb 16, 2026 | Oil and Grease | 10.6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1370369 | |
| Feb 16, 2026 | Oil and Grease | 15.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1370371 | |
| Feb 16, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1370369 | |
| Feb 16, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1370371 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | < 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370369 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | < 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370371 | |
| Feb 16, 2026 | Zinc, Total | .08 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370369 | |
| Feb 16, 2026 | Zinc, Total | .091 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370371 | |
| Nov 14, 2025 | Aluminum, Total | .294 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361527 | |
| Nov 14, 2025 | Aluminum, Total | .216 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361529 | |
| Nov 14, 2025 | Aluminum, Total | .229 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361537 | |
| Nov 14, 2025 | Aluminum, Total | < .156 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370366 | |
| Nov 14, 2025 | Iron, Total | .335 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361527 | |
| Nov 14, 2025 | Iron, Total | .194 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361529 | |
| Nov 14, 2025 | Iron, Total | .191 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361537 | |
| Nov 14, 2025 | Iron, Total | < .054 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370366 | |
| Nov 14, 2025 | Nitrate, Total (as N) | 8.06 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1361527 | |
| Nov 14, 2025 | Nitrate, Total (as N) | .34 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1361529 | |
| Nov 14, 2025 | Nitrate, Total (as N) | .87 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1361537 | |
| Nov 14, 2025 | Nitrate, Total (as N) | .22 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370366 | |
| Nov 14, 2025 | Nitrite Plus Nitrate (as N) | 8.06 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1361527 | |
| Nov 14, 2025 | Nitrite Plus Nitrate (as N) | .38 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1361529 | |
| Nov 14, 2025 | Nitrite Plus Nitrate (as N) | .92 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1361537 | |
| Nov 14, 2025 | Nitrite Plus Nitrate (as N) | .22 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370366 | |
| Nov 14, 2025 | Nitrite, Total (as N) | < .03 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1361527 | |
| Nov 14, 2025 | Nitrite, Total (as N) | .04 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1361529 | |
| Nov 14, 2025 | Nitrite, Total (as N) | .05 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1361537 | |
| Nov 14, 2025 | Nitrite, Total (as N) | .03 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370366 | |
| Nov 14, 2025 | Oil and Grease | 19 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361527 | |
| Nov 14, 2025 | Oil and Grease | 12 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361529 | |
| Nov 14, 2025 | Oil and Grease | 11.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361537 | |
| Nov 14, 2025 | Oil and Grease | 12.3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1370366 | |
| Nov 14, 2025 | pH | 8.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1361527 | |
| Nov 14, 2025 | pH | 7.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1361529 | |
| Nov 14, 2025 | pH | 7.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1361537 | |
| Nov 14, 2025 | pH | 6.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1370366 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | < 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361527 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | < 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361529 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | < 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361537 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | < 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370366 |
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 | 12 | 12 Violation · 0 Potential (preliminary) · 0 Dismissed | Jan 29, 2002 – Jul 22, 2026 | Oct 21, 2026 | All violations |
| Enforcement actions | 11 | 11 issued · 0 draft · 0 withdrawn, rescinded or superseded | Feb 28, 2002 – Jul 22, 2026 | Oct 21, 2026 | All actions |
| Inspections | 3 | inspections, not findings | Jan 29, 2002 – Jul 20, 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 | 3 | reports, by parameter | 2021-22 – 2023-24 | 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 (40 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 22, 2026 | Enforcement actions | 470093 | EPL (Expedited Payment Letter) | Active | R4-2026-0165 |
| Jul 22, 2026 | Violations | 904166 | Effluent | Violation | Report |
| Jul 15, 2026 | Annual reports | 1335597 | Annual report 2025 | — | |
| Apr 30, 2026 | Water-quality-based corrective action reports | 1288075 | WQBCAR 2023-24 | — | Zinc, Total |
| Oct 30, 2025 | Enforcement actions | 467644 | ACL (Administrative Civil Liability) | Historical | R4-2025-0216 |
| Oct 30, 2025 | Violations | 902141 | Effluent | Violation | Report |
| Jul 11, 2025 | Annual reports | 1294427 | Annual report 2024 | — | |
| Jul 25, 2024 | Enforcement actions | 453719 | ACL (Administrative Civil Liability) | Historical | R4-2024-0280 |
| Jul 25, 2024 | Violations | 889414 | Effluent | Violation | Report |
| Jul 12, 2024 | Annual reports | 1243525 | Annual report 2023 | — | |
| Feb 16, 2024 | Water-quality-based corrective action reports | 1276421 | WQBCAR 2021-22 | — | Nitrite Plus Nitrate (as N), Zinc, Total |
| Dec 20, 2023 | Enforcement actions | 452500 | ACL (Administrative Civil Liability) | Historical | R4-2023-0335 |
| Dec 20, 2023 | Violations | 887609 | Effluent | Violation | Report |
| Dec 20, 2023 | Violations | 887610 | Effluent | Violation | Report |
| Dec 20, 2023 | Violations | 887611 | Late Report | Violation | Report |
| Jul 14, 2023 | Annual reports | 1189543 | Annual report 2022 | — | |
| Jul 06, 2022 | Annual reports | 1112943 | Annual report 2021 | — | |
| Jun 28, 2022 | Water-quality-based corrective action reports | 1187245 | WQBCAR 2021-22 | — | Zinc, Total |
| Jun 02, 2022 | Enforcement actions | 446623 | NOV (Notice of Violation) | Historical | |
| Jun 02, 2022 | Violations | 881844 | Late Report | Violation | Report |
| Apr 28, 2022 | Enforcement actions | 446431 | ACL (Administrative Civil Liability) | Historical | R4-2022-0111 |
| Apr 28, 2022 | Violations | 881629 | Effluent | Violation | Report |
| Jun 24, 2021 | Annual reports | 1068962 | Annual report 2020 | — | |
| Apr 09, 2021 | Enforcement actions | 440429 | NOV (Notice of Violation) | Historical | |
| Apr 09, 2021 | Violations | 876699 | Deficient Report | Violation | Report |
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.