Red Ledge Mine
Active WDID 5S29I027233 Nevada City, Nevada 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
- Nevada City, Nevada County
- Region 5S · Central Valley (Sacramento) · Location · Statewide map
- Receiving water
- Washington 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
- None
- Monitoring results Evidence: facility-reported
- 188 distinct results, 5 reporting years (2021 to 2025)
- Most recent sample Apr 11, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 4 inspections · 5 violation records · 6 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
- 39.344242, -120.801533
- Precision
- 6 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
- Nevada County, Nevada City 95959
- Regional Water Board
- 5S — Central Valley (Sacramento)
HUC12 watershed Evidence: spatial
- Humbug Creek-South Yuba River HUC12 180201250702
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
- Red Ledge Mining Company
- Primary industry (SIC)
- 1041-Gold Ores
- Application ID
- 487820
- NOI processed
- Jul 06, 2017
- Last certified
- Jul 20, 2023
- Facility size
- 85 Acres
- Impervious area
- 0 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 487820 | Industrial | Active | Jul 06, 2017 | — | Jul 20, 2023 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Washington 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
2 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.
188 distinct measurements across 3 parameters, most recent sample Apr 11, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 45 | 3 | 0 | Nov 13, 2025 | Apr 11, 2026 |
| 2024 | 57 | 3 | 0 | Nov 21, 2024 | Mar 31, 2025 |
| 2023 | 39 | 3 | 0 | Jan 17, 2024 | Mar 28, 2024 |
| 2022 | 23 | 3 | 0 | Dec 30, 2022 | Apr 11, 2023 |
| 2021 | 24 | 3 | 0 | Dec 23, 2021 | Apr 21, 2022 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 63 | 49 | Dec 23, 2021 | Apr 11, 2026 | Results |
| pH | SU | 63 | 0 | Dec 23, 2021 | Apr 11, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 62 | 1 | Dec 23, 2021 | Apr 11, 2026 | Results |
All results (188 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Apr 11, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1372189 | |
| Apr 11, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1372189 | |
| Apr 11, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1372189 | |
| Apr 11, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1372189 | |
| Apr 11, 2026 | pH | 6.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1372189 | |
| Apr 11, 2026 | pH | 6.98 | SU | Effluent | Qualifying Storm Event | pH_Field | 1372189 | |
| Apr 11, 2026 | pH | 7.18 | SU | Effluent | Qualifying Storm Event | pH_Field | 1372189 | |
| Apr 11, 2026 | pH | 6.97 | SU | Effluent | Qualifying Storm Event | pH_Field | 1372189 | |
| Apr 11, 2026 | Total Suspended Solids (TSS) | 22 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1372189 | |
| Apr 11, 2026 | Total Suspended Solids (TSS) | 43 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1372189 | |
| Apr 11, 2026 | Total Suspended Solids (TSS) | 89 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1372189 | |
| Apr 11, 2026 | Total Suspended Solids (TSS) | 60 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1372189 | |
| Apr 01, 2026 | Oil and Grease | 1.6 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1372132 | |
| Apr 01, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1372132 | |
| Apr 01, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1372132 | |
| Apr 01, 2026 | pH | 7.31 | SU | Effluent | Qualifying Storm Event | pH_Field | 1372132 | |
| Apr 01, 2026 | pH | 7.12 | SU | Effluent | Qualifying Storm Event | pH_Field | 1372132 | |
| Apr 01, 2026 | pH | 7.08 | SU | Effluent | Qualifying Storm Event | pH_Field | 1372132 | |
| Apr 01, 2026 | Total Suspended Solids (TSS) | 40 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1372132 | |
| Apr 01, 2026 | Total Suspended Solids (TSS) | 21 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1372132 | |
| Apr 01, 2026 | Total Suspended Solids (TSS) | 20 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1372132 | |
| Dec 19, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1363888 | |
| Dec 19, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1363888 | |
| Dec 19, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1363888 | |
| Dec 19, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1363888 | |
| Dec 19, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1363888 | |
| Dec 19, 2025 | pH | 7.14 | SU | Effluent | Qualifying Storm Event | pH_Field | 1363888 | |
| Dec 19, 2025 | pH | 7.38 | SU | Effluent | Qualifying Storm Event | pH_Field | 1363888 | |
| Dec 19, 2025 | pH | 6.94 | SU | Effluent | Qualifying Storm Event | pH_Field | 1363888 | |
| Dec 19, 2025 | pH | 7.09 | SU | Effluent | Qualifying Storm Event | pH_Field | 1363888 | |
| Dec 19, 2025 | pH | 7.25 | SU | Effluent | Qualifying Storm Event | pH_Field | 1363888 | |
| Dec 19, 2025 | Total Suspended Solids (TSS) | 130 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363888 | |
| Dec 19, 2025 | Total Suspended Solids (TSS) | 27 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363888 | |
| Dec 19, 2025 | Total Suspended Solids (TSS) | 77 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363888 | |
| Dec 19, 2025 | Total Suspended Solids (TSS) | 74 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363888 | |
| Dec 19, 2025 | Total Suspended Solids (TSS) | 9.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363888 | |
| Nov 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1360165 | |
| Nov 13, 2025 | Oil and Grease | .82 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1360165 | |
| Nov 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1360165 | |
| Nov 13, 2025 | pH | 7.69 | SU | Effluent | Qualifying Storm Event | pH_Field | 1360165 | |
| Nov 13, 2025 | pH | 7.43 | SU | Effluent | Qualifying Storm Event | pH_Field | 1360165 | |
| Nov 13, 2025 | pH | 7.83 | SU | Effluent | Qualifying Storm Event | pH_Field | 1360165 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 180 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360165 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 280 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360165 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 280 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360165 | |
| Mar 31, 2025 | Oil and Grease | .95 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1328973 | |
| Mar 31, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1328973 | |
| Mar 31, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1328973 | |
| Mar 31, 2025 | Oil and Grease | .76 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1328973 | |
| Mar 31, 2025 | pH | 7.6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1328973 |
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 | 5 | 5 Violation · 0 Potential (preliminary) · 0 Dismissed | May 19, 2017 – Jul 15, 2021 | Oct 21, 2026 | All violations |
| Enforcement actions | 6 | 6 issued · 0 draft · 0 withdrawn, rescinded or superseded | May 19, 2017 – Aug 30, 2021 | Oct 21, 2026 | All actions |
| Inspections | 4 | inspections, not findings | Nov 15, 2017 – Oct 24, 2025 | Oct 21, 2026 | All inspections |
| Annual reports | 7 | certified reports (contents not shown) | 2019 – 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 (22 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| May 30, 2026 | Annual reports | 1339724 | Annual report 2025 | — | |
| Oct 24, 2025 | Inspections | 2069386 | B Type compliance | Finalized | No Further Action |
| Jul 01, 2025 | Annual reports | 1298799 | Annual report 2024 | — | |
| Jul 01, 2024 | Annual reports | 1248098 | Annual report 2023 | — | |
| Mar 26, 2024 | Inspections | 2064069 | B Type compliance | Finalized | Follow-up Inspection Needed |
| Sep 06, 2023 | Annual reports | 1194335 | Annual report 2022 | — | |
| Jul 13, 2022 | Annual reports | 1118272 | Annual report 2021 | — | |
| Sep 10, 2021 | Annual reports | 1066550 | Annual report 2020 | — | |
| Aug 30, 2021 | Enforcement actions | 441931 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Active | |
| Jul 15, 2021 | Violations | 878041 | Late Report | Violation | Report |
| Jan 21, 2021 | Annual reports | 983681 | Annual report 2019 | — | |
| Jan 21, 2021 | Enforcement actions | 439695 | NNC (Notice of Non-Compliance) | Active | |
| Jan 13, 2021 | Inspections | 2050098 | B Type compliance | Finalized | Additional Info Required |
| Jan 13, 2021 | Violations | 875991 | Deficient BMP Implementation | Violation | Inspection |
| Nov 09, 2020 | Enforcement actions | 439205 | 2nd NNC - AR (Second Notice of Non-Compliance (annual report)) | Active | |
| Aug 17, 2020 | Enforcement actions | 438425 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Active | |
| Jul 15, 2020 | Violations | 874629 | Late Report | Violation | Report |
| Aug 27, 2019 | Enforcement actions | 433865 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Active | |
| Jul 15, 2019 | Violations | 870739 | Late Report | Violation | Report |
| Nov 15, 2017 | Inspections | 2035671 | B Type compliance | — | No Further Action |
| May 19, 2017 | Enforcement actions | 426256 | NNC (Notice of Non-Compliance) | Historical | |
| May 19, 2017 | Violations | 863485 | Failure to Obtain Permit | 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.