Metrolink Central Maintenance Facility
Active WDID 4 19I009079 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
- Los Angeles River (below LA-Glendale WRP) (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
- 3 waterbodies; 3 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 182 distinct results, 12 reporting years (2015 to 2026)
- Most recent sample Sep 06, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 4 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
- 34.08756, -118.22695
- 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
- 1555 N San Fernando Rd Ste 201, Los Angeles 90065
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Scholl Canyon-Los Angeles River HUC12 180701050210
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
- Southern California Regional Rail Authority
- Primary industry (SIC)
- 4111-Local and Suburban Transit
- Application ID
- 189748
- NOI processed
- Nov 07, 1992
- Last certified
- Nov 24, 2025
- Facility size
- 29 Acres
- Impervious area
- 80 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 189748 | Industrial | Active | Nov 07, 1992 | — | Nov 24, 2025 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Los Angeles River (below LA-Glendale WRP)
- Discharges directly / indirectly
- Y / N (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 |
|---|---|---|---|
| Los Angeles River Reach 3 (Figueroa St. to Riverside Dr.) CAR4052100019990202090157 | 139 m | listed | 5 |
| Arroyo Seco Reach 1 (LA River to West Holly Ave.) CAR4051501019990202132906 | 712 m | listed | 2 |
| Los Angeles River Reach 2 (Carson to Figueroa Street) CAR4051501019990202085021 | 963 m | listed | 9 |
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 |
|---|---|---|---|---|---|---|---|
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Copper, Total | .06749 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.
182 distinct measurements across 4 parameters, most recent sample Sep 06, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2026 | 4 | 4 | 0 | Sep 06, 2026 | Sep 06, 2026 |
| 2025 | 30 | 3 | 0 | Sep 18, 2025 | Feb 16, 2026 |
| 2024 | 10 | 3 | 0 | Feb 05, 2025 | Mar 05, 2025 |
| 2023 | 12 | 3 | 0 | Dec 20, 2023 | Jan 03, 2024 |
| 2022 | 12 | 3 | 0 | Nov 08, 2022 | Feb 24, 2023 |
| 2021 | 12 | 3 | 0 | Dec 09, 2021 | Mar 28, 2022 |
| 2020 | 12 | 3 | 0 | Mar 10, 2021 | Mar 15, 2021 |
| 2019 | 12 | 3 | 0 | Nov 27, 2019 | Mar 10, 2020 |
| 2018 | 24 | 3 | 0 | Nov 29, 2018 | Jan 14, 2019 |
| 2017 | 12 | 3 | 0 | Jan 09, 2018 | Feb 27, 2018 |
| 2016 | 24 | 3 | 0 | Nov 20, 2016 | Feb 06, 2017 |
| 2015 | 18 | 3 | 0 | Dec 22, 2015 | Apr 07, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| pH | SU | 61 | 0 | Dec 22, 2015 | Sep 06, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 61 | 13 | Dec 22, 2015 | Sep 06, 2026 | Results |
| Oil and Grease | mg/L | 59 | 36 | Dec 22, 2015 | Sep 06, 2026 | Results |
| Copper, Total | mg/L | 1 | 0 | Sep 06, 2026 | Sep 06, 2026 | Results |
All results (182 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Sep 06, 2026 | Copper, Total | .029 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1396929 | |
| Sep 06, 2026 | Oil and Grease | DNQ 2.6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1396929 | |
| Sep 06, 2026 | pH | 7.28 | SU | Effluent | Qualifying Storm Event | pH_Field | 1396929 | |
| Sep 06, 2026 | Total Suspended Solids (TSS) | 20 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1396929 | |
| Feb 16, 2026 | Oil and Grease | DNQ 2.3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367807 | |
| Feb 16, 2026 | Oil and Grease | DNQ 3.6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367807 | |
| Feb 16, 2026 | pH | 8.21 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367807 | |
| Feb 16, 2026 | pH | 7.97 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367807 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 14 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367807 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 8.7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367807 | |
| Feb 11, 2026 | Oil and Grease | 7.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367806 | |
| Feb 11, 2026 | Oil and Grease | 8.3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367806 | |
| Feb 11, 2026 | pH | 7.75 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367806 | |
| Feb 11, 2026 | pH | 7.45 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367806 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | 18 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367806 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | 13 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367806 | |
| Nov 14, 2025 | Oil and Grease | DNQ 1.6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367801 | |
| Nov 14, 2025 | Oil and Grease | DNQ 2.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367801 | |
| Nov 14, 2025 | pH | 7.81 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367801 | |
| Nov 14, 2025 | pH | 7.71 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367801 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | 12 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367801 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367801 | |
| Oct 14, 2025 | Oil and Grease | 140 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1355042 | |
| Oct 14, 2025 | Oil and Grease | 180 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1355042 | |
| Oct 14, 2025 | pH | 7.87 | SU | Effluent | Qualifying Storm Event | pH_Field | 1355042 | |
| Oct 14, 2025 | pH | 7.83 | SU | Effluent | Qualifying Storm Event | pH_Field | 1355042 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 16 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1355042 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 24 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1355042 | |
| Sep 18, 2025 | Oil and Grease | 47 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1350011 | |
| Sep 18, 2025 | Oil and Grease | 88 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1350011 | |
| Sep 18, 2025 | pH | 7.15 | SU | Effluent | Qualifying Storm Event | pH_Field | 1350011 | |
| Sep 18, 2025 | pH | 7.03 | SU | Effluent | Qualifying Storm Event | pH_Field | 1350011 | |
| Sep 18, 2025 | Total Suspended Solids (TSS) | 13 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1350011 | |
| Sep 18, 2025 | Total Suspended Solids (TSS) | 15 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1350011 | |
| Mar 05, 2025 | Oil and Grease | 5.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1328097 | |
| Mar 05, 2025 | Oil and Grease | 3.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1328097 | |
| Mar 05, 2025 | pH | 7.35 | SU | Effluent | Qualifying Storm Event | pH_Field | 1328097 | |
| Mar 05, 2025 | pH | 7.39 | SU | Effluent | Qualifying Storm Event | pH_Field | 1328097 | |
| Mar 05, 2025 | Total Suspended Solids (TSS) | 32 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328097 | |
| Mar 05, 2025 | Total Suspended Solids (TSS) | 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328097 | |
| Feb 05, 2025 | pH | 8.06 | SU | Effluent | Qualifying Storm Event | pH_Field | 1324874 | |
| Feb 05, 2025 | pH | 7.88 | SU | Effluent | Qualifying Storm Event | pH_Field | 1324874 | |
| Feb 05, 2025 | Total Suspended Solids (TSS) | 5.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1324874 | |
| Feb 05, 2025 | Total Suspended Solids (TSS) | 5.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1324874 | |
| Jan 03, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1273001 | |
| Jan 03, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1273001 | |
| Jan 03, 2024 | pH | 7.98 | SU | Effluent | Qualifying Storm Event | pH_Field | 1273001 | |
| Jan 03, 2024 | pH | 7.92 | SU | Effluent | Qualifying Storm Event | pH_Field | 1273001 | |
| Jan 03, 2024 | Total Suspended Solids (TSS) | 3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1273001 | |
| Jan 03, 2024 | Total Suspended Solids (TSS) | 2.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1273001 |
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 | 4 | 4 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 1999 – Aug 26, 2015 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 3 issued · 0 draft · 0 withdrawn, rescinded or superseded | Dec 30, 2009 – Sep 25, 2015 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Aug 26, 2015 – Aug 26, 2015 | 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 (19 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 13, 2026 | Annual reports | 1334003 | Annual report 2025 | — | |
| Jul 14, 2025 | Annual reports | 1292769 | Annual report 2024 | — | |
| Jul 10, 2024 | Annual reports | 1241763 | Annual report 2023 | — | |
| Jul 14, 2023 | Annual reports | 1187683 | Annual report 2022 | — | |
| Jun 28, 2022 | Annual reports | 1110932 | Annual report 2021 | — | |
| Jul 15, 2021 | Annual reports | 1066857 | Annual report 2020 | — | |
| Jul 15, 2020 | Annual reports | 984002 | Annual report 2019 | — | |
| Jul 01, 2019 | Annual reports | 951495 | Annual report 2018 | — | |
| Jul 16, 2018 | Annual reports | 936901 | Annual report 2017 | — | |
| Jul 03, 2017 | Annual reports | 876040 | Annual report 2016 | — | |
| Jul 08, 2016 | Annual reports | 839717 | Annual report 2015 | — | |
| Sep 25, 2015 | Enforcement actions | 419794 | NOV (Notice of Violation) | Historical | |
| Aug 26, 2015 | Inspections | 2026547 | Complaint | — | Follow-up Inspection Needed |
| Aug 26, 2015 | Violations | 857568 | Deficient BMP Implementation | Violation | Inspection |
| Jan 09, 2015 | Enforcement actions | 417629 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Jan 09, 2015 | Violations | 855871 | Late Report | Violation | Report |
| Dec 30, 2009 | Enforcement actions | 405009 | SEL (Staff Enforcement Letter) | Historical | |
| Dec 22, 2008 | Violations | 844259 | Deficient BMP Implementation | Violation | Report |
| Jul 02, 1999 | Violations | 155262 | 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.