Cosumnes Power Plant
Active WDID 5S34I020075 Herald, Sacramento 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
- Herald, Sacramento County
- Region 5S · Central Valley (Sacramento) · 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
- 68 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Nov 17, 2025 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 0 inspections · 2 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
- 38.33618, -121.12122
- 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
- 14295 Clay East Rd, Herald 95638
- Regional Water Board
- 5S — Central Valley (Sacramento)
HUC12 watershed Evidence: spatial
- Hadselville Creek HUC12 180400130703
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
- Sacramento Municipal Utility District
- Primary industry (SIC)
- 4911-Electric Services
- Application ID
- 296948
- NOI processed
- Feb 10, 2006
- Last certified
- Jan 26, 2022
- Facility size
- 30 Acres
- Impervious area
- 50 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 296948 | Industrial | Active | Feb 10, 2006 | — | Jan 26, 2022 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Clay Creek
- 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
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.
68 distinct measurements across 5 parameters, most recent sample Nov 17, 2025.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 4 | 4 | 0 | Nov 17, 2025 | Nov 17, 2025 |
| 2024 | 4 | 4 | 0 | Feb 13, 2025 | Feb 13, 2025 |
| 2023 | 4 | 4 | 0 | Jan 26, 2024 | Jan 26, 2024 |
| 2022 | 8 | 4 | 0 | Dec 14, 2022 | Jan 09, 2023 |
| 2021 | 4 | 4 | 0 | Nov 03, 2021 | Nov 03, 2021 |
| 2020 | 4 | 4 | 0 | Jan 28, 2021 | Jan 28, 2021 |
| 2019 | 4 | 4 | 0 | Apr 06, 2020 | Apr 06, 2020 |
| 2018 | 8 | 4 | 0 | Nov 29, 2018 | Jan 10, 2019 |
| 2017 | 4 | 4 | 0 | Jan 09, 2018 | Jan 09, 2018 |
| 2016 | 16 | 5 | 0 | Oct 17, 2016 | Feb 07, 2017 |
| 2015 | 8 | 4 | 0 | Jan 18, 2016 | Mar 07, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 17 | 14 | Jan 18, 2016 | Nov 17, 2025 | Results |
| pH | SU | 17 | 0 | Jan 18, 2016 | Nov 17, 2025 | Results |
| Total Suspended Solids (TSS) | mg/L | 17 | 2 | Jan 18, 2016 | Nov 17, 2025 | Results |
| Iron, Total | mg/L | 12 | 0 | Jan 18, 2016 | Nov 17, 2025 | Results |
| Iron, Total Recoverable | mg/L | 5 | 0 | Dec 16, 2016 | Nov 03, 2021 | Results |
All results (68 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Nov 17, 2025 | Iron, Total | .99 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1359408 | |
| Nov 17, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1359408 | |
| Nov 17, 2025 | pH | 7.43 | SU | Effluent | Qualifying Storm Event | pH_Field | 1359408 | |
| Nov 17, 2025 | Total Suspended Solids (TSS) | 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1359408 | |
| Feb 13, 2025 | Iron, Total | .37 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1324378 | |
| Feb 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1324378 | |
| Feb 13, 2025 | pH | 6.88 | SU | Effluent | Qualifying Storm Event | pH_Field | 1324378 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1324378 | |
| Jan 26, 2024 | Iron, Total | .17 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1276268 | |
| Jan 26, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1276268 | |
| Jan 26, 2024 | pH | 8.01 | SU | Effluent | Qualifying Storm Event | pH_Field | 1276268 | |
| Jan 26, 2024 | Total Suspended Solids (TSS) | 6.6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1276268 | |
| Jan 09, 2023 | Iron, Total | .48 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1223094 | |
| Jan 09, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1223094 | |
| Jan 09, 2023 | pH | 7.43 | SU | Effluent | Qualifying Storm Event | pH_Field | 1223094 | |
| Jan 09, 2023 | Total Suspended Solids (TSS) | 5.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1223094 | |
| Dec 14, 2022 | Iron, Total | .29 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1220531 | |
| Dec 14, 2022 | Oil and Grease | 1.6 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1220531 | |
| Dec 14, 2022 | pH | 8.3 | SU | Effluent | Qualifying Storm Event | pH_Field | 1220531 | |
| Dec 14, 2022 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1220531 | |
| Nov 03, 2021 | Iron, Total Recoverable | .07 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1168548 | |
| Nov 03, 2021 | Oil and Grease | ND .66 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1168548 | |
| Nov 03, 2021 | pH | 6.05 | SU | Effluent | Qualifying Storm Event | A4500HB | 1168548 | |
| Nov 03, 2021 | Total Suspended Solids (TSS) | 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1168548 | |
| Jan 28, 2021 | Iron, Total Recoverable | .69 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1140915 | |
| Jan 28, 2021 | Oil and Grease | ND .66 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1140915 | |
| Jan 28, 2021 | pH | 7.15 | SU | Effluent | Qualifying Storm Event | pH_Field | 1141034 | |
| Jan 28, 2021 | Total Suspended Solids (TSS) | 7.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1140915 | |
| Apr 06, 2020 | Iron, Total | 1 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1107739 | |
| Apr 06, 2020 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1107739 | |
| Apr 06, 2020 | pH | 6.54 | SU | Effluent | Qualifying Storm Event | A4500HB | 1107739 | |
| Apr 06, 2020 | Total Suspended Solids (TSS) | 11 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1107739 | |
| Jan 10, 2019 | Iron, Total | .28 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1038525 | |
| Jan 10, 2019 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1038525 | |
| Jan 10, 2019 | pH | 7.13 | SU | Effluent | Qualifying Storm Event | pH_Field | 1038525 | |
| Jan 10, 2019 | Total Suspended Solids (TSS) | 4.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1038525 | |
| Nov 29, 2018 | Iron, Total | .19 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1029713 | |
| Nov 29, 2018 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1029713 | |
| Nov 29, 2018 | pH | 7.3 | SU | Effluent | Qualifying Storm Event | A4500HB | 1029713 | |
| Nov 29, 2018 | Total Suspended Solids (TSS) | 3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1029713 | |
| Jan 09, 2018 | Iron, Total | .52 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 989537 | |
| Jan 09, 2018 | Oil and Grease | .9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 989537 | |
| Jan 09, 2018 | pH | 7.22 | SU | Effluent | Qualifying Storm Event | pH_Field | 989537 | |
| Jan 09, 2018 | Total Suspended Solids (TSS) | 3.7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 989537 | |
| Feb 07, 2017 | Iron, Total Recoverable | .25 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 920747 | |
| Feb 07, 2017 | Oil and Grease | ND .66 | mg/L | Effluent | Qualifying Storm Event | E1664A | 920747 | |
| Feb 07, 2017 | pH | 6.88 | SU | Effluent | Qualifying Storm Event | pH_Field | 920747 | |
| Feb 07, 2017 | Total Suspended Solids (TSS) | 2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 920747 | |
| Jan 05, 2017 | Iron, Total Recoverable | .37 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 920671 | |
| Jan 05, 2017 | Oil and Grease | 1.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 920671 |
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 | 2 | 2 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 2006 – Jul 01, 2007 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 3 issued · 0 draft · 0 withdrawn, rescinded or superseded | Aug 17, 2006 – May 01, 2008 | 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 (16 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 09, 2026 | Annual reports | 1334012 | Annual report 2025 | — | |
| Jun 16, 2025 | Annual reports | 1292778 | Annual report 2024 | — | |
| Jun 14, 2024 | Annual reports | 1241772 | Annual report 2023 | — | |
| Jun 05, 2023 | Annual reports | 1187692 | Annual report 2022 | — | |
| Jul 07, 2022 | Annual reports | 1110943 | Annual report 2021 | — | |
| Jun 11, 2021 | Annual reports | 1066870 | Annual report 2020 | — | |
| Jul 07, 2020 | Annual reports | 984015 | Annual report 2019 | — | |
| Jun 28, 2019 | Annual reports | 951508 | Annual report 2018 | — | |
| Jul 02, 2018 | Annual reports | 936914 | Annual report 2017 | — | |
| Jul 07, 2017 | Annual reports | 876056 | Annual report 2016 | — | |
| Jul 06, 2016 | Annual reports | 840844 | Annual report 2015 | — | |
| May 01, 2008 | Enforcement actions | 347455 | SEL (Staff Enforcement Letter) | Active | |
| Jul 01, 2007 | Violations | 765539 | Deficient BMP Implementation | Violation | Storm Water Discharge |
| Oct 25, 2006 | Enforcement actions | 317274 | NNC (Notice of Non-Compliance) | Active | |
| Aug 17, 2006 | Enforcement actions | 316118 | NNC (Notice of Non-Compliance) | Active | |
| Jul 02, 2006 | Violations | 445815 | Late 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.