Gateway Generating Station
Active WDID 5S07I021950 Antioch, Contra Costa County Region 5S · Central Valley (Sacramento)
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Antioch, Contra Costa County
- Region 5S · Central Valley (Sacramento) · Location · Statewide map
- Receiving water
- San Joaquin River (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
- 245 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 0 inspections · 1 violation record · 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
- 38.01228, -121.75859
- 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
- 3225 Wilbur Ave, Antioch 94509
- Regional Water Board
- 5S — Central Valley (Sacramento)
HUC12 watershed Evidence: spatial
- Markley Canyon-San Joaquin River HUC12 180400030907
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
- Pacific Gas Electric Company
- Primary industry (SIC)
- 4911-Electric Services
- Application ID
- 355878
- NOI processed
- Dec 05, 2008
- Last certified
- Jan 23, 2025
- Facility size
- 32.5 Acres
- Impervious area
- 28 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 355878 | Industrial | Active | Dec 05, 2008 | — | Jan 23, 2025 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- San Joaquin River
- Discharges directly / indirectly
- N / N (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
11 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
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.
245 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 | 20 | 6 | 0 | Nov 13, 2025 | Feb 16, 2026 |
| 2024 | 20 | 5 | 0 | Nov 25, 2024 | Feb 04, 2025 |
| 2023 | 20 | 5 | 0 | Dec 18, 2023 | Jan 16, 2024 |
| 2022 | 25 | 5 | 0 | Nov 08, 2022 | Feb 03, 2023 |
| 2021 | 10 | 5 | 0 | Nov 01, 2021 | Nov 09, 2021 |
| 2020 | 20 | 5 | 0 | Dec 13, 2020 | Feb 11, 2021 |
| 2019 | 20 | 5 | 0 | Dec 04, 2019 | Jan 16, 2020 |
| 2018 | 25 | 5 | 0 | Nov 21, 2018 | Feb 01, 2019 |
| 2017 | 20 | 5 | 0 | Nov 16, 2017 | Mar 01, 2018 |
| 2016 | 45 | 5 | 0 | Oct 16, 2016 | Apr 06, 2017 |
| 2015 | 20 | 5 | 0 | Nov 02, 2015 | Apr 09, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 49 | 0 | Nov 02, 2015 | Feb 16, 2026 | Results |
| Oil and Grease | mg/L | 49 | 49 | Nov 02, 2015 | Feb 16, 2026 | Results |
| pH | SU | 49 | 0 | Nov 02, 2015 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 49 | 7 | Nov 02, 2015 | Feb 16, 2026 | Results |
| Iron, Total | mg/L | 48 | 6 | Nov 02, 2015 | Feb 16, 2026 | Results |
| Iron, Total Recoverable | ug/L | 1 | 1 | Feb 11, 2026 | Feb 11, 2026 | Results |
Iron, Total results (48 distinct rows, show all)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Iron, Total | .0879 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1368383 | |
| Nov 20, 2025 | Iron, Total | .0743 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361049 | |
| Nov 13, 2025 | Iron, Total | .656 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1360606 | |
| Feb 04, 2025 | Iron, Total | .18 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1322200 | |
| Feb 01, 2025 | Iron, Total | .74 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1322409 | |
| Dec 12, 2024 | Iron, Total | .3 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1317006 | |
| Nov 25, 2024 | Iron, Total | .13 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1316704 | |
| Jan 16, 2024 | Iron, Total | DNQ .064 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1273316 | |
| Jan 13, 2024 | Iron, Total | .5 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1273308 | |
| Dec 29, 2023 | Iron, Total | DNQ .078 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1273294 | |
| Dec 18, 2023 | Iron, Total | .49 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1271126 | |
| Feb 03, 2023 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1226692 | |
| Jan 19, 2023 | Iron, Total | .4 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1225938 | |
| Dec 26, 2022 | Iron, Total | .59 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1221662 | |
| Dec 10, 2022 | Iron, Total | .35 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1220753 | |
| Nov 08, 2022 | Iron, Total | 3.6 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1216658 | |
| Nov 09, 2021 | Iron, Total | .67 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1170062 | |
| Nov 01, 2021 | Iron, Total | .44 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1169948 | |
| Feb 11, 2021 | Iron, Total | 1.4 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1144705 | |
| Jan 27, 2021 | Iron, Total | .65 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1143149 | |
| Dec 17, 2020 | Iron, Total | .42 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1138194 | |
| Dec 13, 2020 | Iron, Total | .87 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1138041 | |
| Jan 16, 2020 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1100532 | |
| Jan 09, 2020 | Iron, Total | .29 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1100197 | |
| Dec 10, 2019 | Iron, Total | .29 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1093965 | |
| Dec 04, 2019 | Iron, Total | .81 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1092412 | |
| Feb 01, 2019 | Iron, Total | 1.1 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1040646 | |
| Jan 15, 2019 | Iron, Total | .2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1037421 | |
| Dec 05, 2018 | Iron, Total | .48 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1030850 | |
| Nov 29, 2018 | Iron, Total | 1.4 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1030850 | |
| Nov 21, 2018 | Iron, Total | 1.7 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1029925 | |
| Mar 01, 2018 | Iron, Total | .39 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 995196 | |
| Jan 08, 2018 | Iron, Total | .44 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 989740 | |
| Dec 20, 2017 | Iron, Total | .054 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 989740 | |
| Nov 16, 2017 | Iron, Total | .24 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 977783 | |
| Apr 06, 2017 | Iron, Total | .021 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 931364 | |
| Mar 21, 2017 | Iron, Total | .016 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 930217 | |
| Mar 05, 2017 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 930216 | |
| Feb 17, 2017 | Iron, Total | .063 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 926368 | |
| Feb 02, 2017 | Iron, Total | .11 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 926342 | |
| Jan 04, 2017 | Iron, Total | 2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 912613 | |
| Dec 08, 2016 | Iron, Total | .83 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 912590 | |
| Nov 03, 2016 | Iron, Total | ND | mg/L | Effluent | Non-Storm Water Discharge Event | E200.7 | 908267 | |
| Oct 16, 2016 | Iron, Total | 4.2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 907826 | |
| Apr 09, 2016 | Iron, Total | 13 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 871227 | |
| Jan 29, 2016 | Iron, Total | .76 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 865501 | |
| Dec 10, 2015 | Iron, Total | 2.2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 858488 | |
| Nov 02, 2015 | Iron, Total | 4.8 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 857804 |
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 | 1 | 1 Violation · 0 Potential (preliminary) · 0 Dismissed | Oct 14, 2010 – Oct 14, 2010 | Oct 21, 2026 | All violations |
| Enforcement actions | 1 | 1 issued · 0 draft · 0 withdrawn, rescinded or superseded | Oct 14, 2010 – Oct 14, 2010 | Oct 21, 2026 | All actions |
| Inspections | 0 | inspections, not findings | — | Oct 21, 2026 | |
| 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 |
|---|---|---|---|---|---|
| Jul 08, 2026 | Annual reports | 1334715 | Annual report 2025 | — | |
| Jul 03, 2025 | Annual reports | 1293507 | Annual report 2024 | — | |
| Jul 02, 2024 | Annual reports | 1242543 | Annual report 2023 | — | |
| Jul 10, 2023 | Annual reports | 1188518 | Annual report 2022 | — | |
| Jun 30, 2022 | Annual reports | 1111825 | Annual report 2021 | — | |
| Jul 04, 2021 | Annual reports | 1067795 | Annual report 2020 | — | |
| Jul 01, 2020 | Annual reports | 984993 | Annual report 2019 | — | |
| Jul 02, 2019 | Annual reports | 952510 | Annual report 2018 | — | |
| Jul 11, 2018 | Annual reports | 937923 | Annual report 2017 | — | |
| Jul 03, 2017 | Annual reports | 877119 | Annual report 2016 | — | |
| Jul 15, 2016 | Annual reports | 845788 | Annual report 2015 | — | |
| Oct 14, 2010 | Enforcement actions | 403225 | SEL (Staff Enforcement Letter) | Historical | |
| Oct 14, 2010 | Violations | 842952 | Deficient BMP Implementation | 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.