AMTRAK S L O Maintenance Facility
Active WDID 3 40I018319 San Luis Obispo, San Luis Obispo County Region 3 · Central Coast
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- San Luis Obispo, San Luis Obispo County
- Region 3 · Central Coast · Location · Statewide map
- Receiving water
- San Luis Obispo 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
- 2 waterbodies; 1 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 91 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 2 inspections · 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
- 35.27544, -120.65556
- 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
- 1011 12 Railroad Ave, San Luis Obispo 93401
- Regional Water Board
- 3 — Central Coast
HUC12 watershed Evidence: spatial
- Upper San Luis Obispo Creek HUC12 180600060701
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
- Amtrak SLO Maintenance Facility
- Primary industry (SIC)
- 4011-Railroads, Line-haul Operating
- Application ID
- 185778
- NOI processed
- Aug 26, 2003
- Last certified
- Feb 01, 2024
- Facility size
- 56000 SqFt
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 185778 | Industrial | Active | Aug 26, 2003 | — | Feb 01, 2024 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- San Luis Obispo 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
3 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 Luis Obispo Creek (above Osos Street) CAR3102401119980824143123 | 626 m | not listed | 0 |
| San Luis Obispo Creek (below Osos Street) CAR3102402119980828115513 | 782 m | listed | 7 |
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.
91 distinct measurements across 4 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 | 7 | 4 | 0 | Nov 13, 2025 | Feb 16, 2026 |
| 2024 | 6 | 3 | 0 | Nov 25, 2024 | Feb 04, 2025 |
| 2023 | 6 | 3 | 0 | Dec 18, 2023 | Jan 22, 2024 |
| 2022 | 12 | 3 | 0 | Sep 19, 2022 | Feb 24, 2023 |
| 2021 | 6 | 3 | 0 | Oct 25, 2021 | Mar 28, 2022 |
| 2020 | 6 | 3 | 0 | Dec 28, 2020 | Jan 27, 2021 |
| 2019 | 6 | 3 | 0 | Dec 22, 2019 | Jan 16, 2020 |
| 2018 | 6 | 3 | 0 | Oct 03, 2018 | Jan 05, 2019 |
| 2017 | 6 | 3 | 0 | Jan 08, 2018 | Mar 01, 2018 |
| 2016 | 18 | 3 | 0 | Oct 16, 2016 | Jan 18, 2017 |
| 2015 | 12 | 3 | 0 | Nov 02, 2015 | Jan 31, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 30 | 10 | Nov 02, 2015 | Feb 16, 2026 | Results |
| pH | SU | 30 | 0 | Nov 02, 2015 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 30 | 1 | Nov 02, 2015 | Feb 16, 2026 | Results |
| Temperature | Degrees C | 1 | 0 | Feb 16, 2026 | Feb 16, 2026 | Results |
All results (91 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Oil and Grease | 3.44 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367254 | |
| Feb 16, 2026 | pH | 7.18 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367254 | |
| Feb 16, 2026 | Temperature | 12.4 | Degrees C | Effluent | Qualifying Storm Event | A2550B | 1367254 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367254 | |
| Nov 13, 2025 | Oil and Grease | < .512 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1359870 | |
| Nov 13, 2025 | pH | 6.75 | SU | Effluent | Qualifying Storm Event | pH_Field | 1359870 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 37.6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1359870 | |
| Feb 04, 2025 | Oil and Grease | 1.17 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1322252 | |
| Feb 04, 2025 | pH | 7.7 | SU | Effluent | Qualifying Storm Event | A4500HB | 1322252 | |
| Feb 04, 2025 | Total Suspended Solids (TSS) | 44.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1322252 | |
| Nov 25, 2024 | Oil and Grease | 3.78 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1319248 | |
| Nov 25, 2024 | pH | 6.9 | SU | Effluent | Qualifying Storm Event | A4500HB | 1319248 | |
| Nov 25, 2024 | Total Suspended Solids (TSS) | 60 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1319248 | |
| Jan 22, 2024 | Oil and Grease | .681 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1274179 | |
| Jan 22, 2024 | pH | 6.87 | SU | Effluent | Qualifying Storm Event | pH_Field | 1274179 | |
| Jan 22, 2024 | Total Suspended Solids (TSS) | 2.1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1274179 | |
| Dec 18, 2023 | Oil and Grease | .985 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1270284 | |
| Dec 18, 2023 | pH | 7.58 | SU | Effluent | Qualifying Storm Event | pH_Field | 1270284 | |
| Dec 18, 2023 | Total Suspended Solids (TSS) | 15.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1270284 | |
| Feb 24, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1228358 | |
| Feb 24, 2023 | pH | 7.59 | SU | Effluent | Qualifying Storm Event | pH_Field | 1228358 | |
| Feb 24, 2023 | Total Suspended Solids (TSS) | 1.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1228358 | |
| Jan 13, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1223415 | |
| Jan 13, 2023 | pH | 7.47 | SU | Effluent | Qualifying Storm Event | pH_Field | 1223415 | |
| Jan 13, 2023 | Total Suspended Solids (TSS) | 2.7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1223415 | |
| Nov 07, 2022 | Oil and Grease | .763 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1216061 | |
| Nov 07, 2022 | pH | 7.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1216061 | |
| Nov 07, 2022 | Total Suspended Solids (TSS) | 7.18 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1216061 | |
| Sep 19, 2022 | Oil and Grease | DNQ .863 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1214493 | |
| Sep 19, 2022 | pH | 7.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1214493 | |
| Sep 19, 2022 | Total Suspended Solids (TSS) | 5.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1214493 | |
| Mar 28, 2022 | Oil and Grease | .669 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1180533 | |
| Mar 28, 2022 | pH | > 8.4 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1180533 | |
| Mar 28, 2022 | Total Suspended Solids (TSS) | 7.71 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1180533 | |
| Oct 25, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1168998 | |
| Oct 25, 2021 | pH | 8.63 | SU | Effluent | Qualifying Storm Event | pH_Field | 1168998 | |
| Oct 25, 2021 | Total Suspended Solids (TSS) | 3.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1168998 | |
| Jan 27, 2021 | Oil and Grease | 3.09 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1140960 | |
| Jan 27, 2021 | pH | 6.72 | SU | Effluent | Qualifying Storm Event | pH_Field | 1140960 | |
| Jan 27, 2021 | Total Suspended Solids (TSS) | 6.83 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1140960 | |
| Dec 28, 2020 | Oil and Grease | 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1138394 | |
| Dec 28, 2020 | pH | 6.76 | SU | Effluent | Qualifying Storm Event | pH_Field | 1138394 | |
| Dec 28, 2020 | Total Suspended Solids (TSS) | 6.5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1138394 | |
| Jan 16, 2020 | Oil and Grease | 1.54 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1098617 | |
| Jan 16, 2020 | pH | 6.79 | SU | Effluent | Qualifying Storm Event | pH_Field | 1098617 | |
| Jan 16, 2020 | Total Suspended Solids (TSS) | 14 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1098617 | |
| Dec 22, 2019 | Oil and Grease | .769 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1095491 | |
| Dec 22, 2019 | pH | 8.09 | SU | Effluent | Qualifying Storm Event | pH_Field | 1095491 | |
| Dec 22, 2019 | Total Suspended Solids (TSS) | 7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1095491 | |
| Jan 05, 2019 | Oil and Grease | 2.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1033952 |
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 | 2 | inspections, not findings | May 20, 2011 – Apr 24, 2024 | 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 (13 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jun 24, 2026 | Annual reports | 1335935 | Annual report 2025 | — | |
| Jul 10, 2025 | Annual reports | 1294772 | Annual report 2024 | — | |
| Jun 24, 2024 | Annual reports | 1243886 | Annual report 2023 | — | |
| Apr 24, 2024 | Inspections | 2064157 | B Type compliance | Finalized | No Further Action |
| Jun 28, 2023 | Annual reports | 1189917 | Annual report 2022 | — | |
| Jul 05, 2022 | Annual reports | 1113339 | Annual report 2021 | — | |
| Jul 01, 2021 | Annual reports | 1069378 | Annual report 2020 | — | |
| Jul 13, 2020 | Annual reports | 986691 | Annual report 2019 | — | |
| Jun 24, 2019 | Annual reports | 954272 | Annual report 2018 | — | |
| Jul 12, 2018 | Annual reports | 939690 | Annual report 2017 | — | |
| Jul 11, 2017 | Annual reports | 878973 | Annual report 2016 | — | |
| Jul 11, 2016 | Annual reports | 846931 | Annual report 2015 | — | |
| May 20, 2011 | Inspections | 2011798 | B Type compliance | — | No Further Action |
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.