Hetch Hetchy Water Power
Active WDID 5S55I001835 Moccasin, Tuolumne 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
- Moccasin, Tuolumne 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
- 334 distinct results, 10 reporting years (2015 to 2025)
- Most recent sample Apr 21, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 0 inspections · 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
- 37.81076, -120.29991
- 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
- 1 Lakeside Dr, Moccasin 95347
- Regional Water Board
- 5S — Central Valley (Sacramento)
HUC12 watershed Evidence: spatial
- Moccasin Creek HUC12 180400091202
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
- San Francisco City County
- Primary industry (SIC)
- 4225-General Warehousing and Storage
- Secondary SIC
- 4952-Sewerage Systems
- Application ID
- 202782
- NOI processed
- Mar 30, 1992
- Last certified
- Nov 07, 2023
- Facility size
- 20 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 202782 | Industrial | Active | Mar 30, 1992 | — | Nov 07, 2023 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Moccasin Creek
- 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.
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.
334 distinct measurements across 3 parameters, most recent sample Apr 21, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 24 | 3 | 0 | Nov 13, 2025 | Apr 21, 2026 |
| 2024 | 23 | 3 | 0 | Dec 16, 2024 | Mar 06, 2025 |
| 2023 | 9 | 3 | 0 | Dec 20, 2023 | Jan 23, 2024 |
| 2022 | 45 | 3 | 0 | Nov 07, 2022 | May 04, 2023 |
| 2020 | 36 | 3 | 0 | Nov 18, 2020 | Mar 10, 2021 |
| 2019 | 69 | 3 | 0 | Dec 04, 2019 | Apr 06, 2020 |
| 2018 | 54 | 3 | 0 | Jan 09, 2019 | May 21, 2019 |
| 2017 | 30 | 3 | 0 | Nov 16, 2017 | Mar 21, 2018 |
| 2016 | 18 | 3 | 0 | Oct 28, 2016 | Apr 13, 2017 |
| 2015 | 26 | 3 | 0 | Nov 02, 2015 | Mar 07, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| pH | SU | 113 | 1 | Nov 02, 2015 | Apr 21, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 113 | 31 | Nov 02, 2015 | Apr 21, 2026 | Results |
| Oil and Grease | mg/L | 108 | 97 | Nov 02, 2015 | Apr 21, 2026 | Results |
All results (334 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Apr 21, 2026 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1373748 | |
| Apr 21, 2026 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1373748 | |
| Apr 21, 2026 | pH | 8.16 | SU | Effluent | Qualifying Storm Event | pH_Field | 1373748 | |
| Apr 21, 2026 | pH | 7.7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1373748 | |
| Apr 21, 2026 | Total Suspended Solids (TSS) | 68.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1373748 | |
| Apr 21, 2026 | Total Suspended Solids (TSS) | 9.54 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1373748 | |
| Feb 19, 2026 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1370244 | |
| Feb 19, 2026 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1370244 | |
| Feb 19, 2026 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1370244 | |
| Feb 19, 2026 | pH | 8.05 | SU | Effluent | Qualifying Storm Event | pH_Field | 1370244 | |
| Feb 19, 2026 | pH | 7.41 | SU | Effluent | Qualifying Storm Event | pH_Field | 1370244 | |
| Feb 19, 2026 | pH | 7.86 | SU | Effluent | Qualifying Storm Event | pH_Field | 1370244 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | 28 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370244 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | 28 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370244 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | 159 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370244 | |
| Nov 13, 2025 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361076 | |
| Nov 13, 2025 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361076 | |
| Nov 13, 2025 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361076 | |
| Nov 13, 2025 | pH | 7.49 | SU | Effluent | Qualifying Storm Event | pH_Field | 1361076 | |
| Nov 13, 2025 | pH | 7.03 | SU | Effluent | Qualifying Storm Event | pH_Field | 1361076 | |
| Nov 13, 2025 | pH | 6.75 | SU | Effluent | Qualifying Storm Event | pH_Field | 1361076 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361076 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 15.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361076 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 113 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361076 | |
| Mar 06, 2025 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329871 | |
| Mar 06, 2025 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329871 | |
| Mar 06, 2025 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329871 | |
| Mar 06, 2025 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329871 | |
| Mar 06, 2025 | pH | 8.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329871 | |
| Mar 06, 2025 | pH | 8.2 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329871 | |
| Mar 06, 2025 | pH | 8.3 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329871 | |
| Mar 06, 2025 | pH | 8.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329871 | |
| Mar 06, 2025 | Total Suspended Solids (TSS) | 131 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329871 | |
| Mar 06, 2025 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329871 | |
| Mar 06, 2025 | Total Suspended Solids (TSS) | 7.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329871 | |
| Mar 06, 2025 | Total Suspended Solids (TSS) | 24.6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329871 | |
| Feb 05, 2025 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1324142 | |
| Feb 05, 2025 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1324142 | |
| Feb 05, 2025 | pH | 7.39 | SU | Effluent | Qualifying Storm Event | pH_Field | 1324142 | |
| Feb 05, 2025 | pH | 7.54 | SU | Effluent | Qualifying Storm Event | pH_Field | 1324142 | |
| Feb 05, 2025 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1324142 | |
| Feb 05, 2025 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1324142 | |
| Dec 16, 2024 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1319696 | |
| Dec 16, 2024 | pH | 6.3 | SU | Effluent | Qualifying Storm Event | pH_Field | 1319696 | |
| Dec 16, 2024 | pH | 6.6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1319696 | |
| Dec 16, 2024 | Total Suspended Solids (TSS) | 39.5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1319696 | |
| Dec 16, 2024 | Total Suspended Solids (TSS) | 32.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1319696 | |
| Jan 23, 2024 | Oil and Grease | < 3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1270918 | |
| Jan 23, 2024 | pH | 7.87 | SU | Effluent | Qualifying Storm Event | pH_Field | 1270918 | |
| Jan 23, 2024 | Total Suspended Solids (TSS) | < 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1270918 |
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 – Jul 01, 2009 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 3 issued · 0 draft · 0 withdrawn, rescinded or superseded | Mar 27, 2000 – Oct 23, 2009 | 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 (18 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jun 29, 2026 | Annual reports | 1334647 | Annual report 2025 | — | |
| Jul 07, 2025 | Annual reports | 1293437 | Annual report 2024 | — | |
| Jul 09, 2024 | Annual reports | 1242468 | Annual report 2023 | — | |
| Jul 03, 2023 | Annual reports | 1188434 | Annual report 2022 | — | |
| Jul 13, 2022 | Annual reports | 1111737 | Annual report 2021 | — | |
| Jul 12, 2021 | Annual reports | 1067704 | Annual report 2020 | — | |
| Jul 12, 2020 | Annual reports | 984895 | Annual report 2019 | — | |
| Jul 02, 2019 | Annual reports | 952411 | Annual report 2018 | — | |
| Jul 19, 2018 | Annual reports | 937824 | Annual report 2017 | — | |
| Jul 14, 2017 | Annual reports | 877014 | Annual report 2016 | — | |
| Jul 13, 2016 | Annual reports | 842488 | Annual report 2015 | — | |
| Oct 23, 2009 | Enforcement actions | 401770 | SEL (Staff Enforcement Letter) | Historical | |
| Jul 01, 2009 | Violations | 841612 | Deficient BMP Implementation | Violation | Report |
| Aug 17, 2006 | Enforcement actions | 315860 | NNC (Notice of Non-Compliance) | Active | |
| Jul 02, 2006 | Violations | 445627 | Late Report | Violation | Report |
| Mar 27, 2000 | Enforcement actions | 231017 | SEL (Staff Enforcement Letter) | Historical | UNKNOWN |
| Mar 27, 2000 | Violations | 174264 | Deficient Report | Violation | Inspection |
| Jul 02, 1999 | Violations | 170625 | 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.