Colombo Mine
Terminated WDID 5S46I029553 Sierra City, Sierra County Region 5S · Central Valley (Sacramento)
At a glance
- Permit Evidence: SMARTS record
- Terminated Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Sierra City, Sierra 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
- 3 distinct results, 1 reporting year (2021 to 2021)
- Most recent sample Mar 15, 2022 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 0 inspections · 4 violation records · 10 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
- 39.57777, -120.674647
- 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
- SEC 30 CA T20N R12E MDM TAHOE NATIONAL FOREST, Sierra City 96125
- Regional Water Board
- 5S — Central Valley (Sacramento)
HUC12 watershed Evidence: spatial
- Jim Crow Creek-North Yuba River HUC12 180201250203
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
- Terminated
- Operator
- Sierra Minerals LLC
- Primary industry (SIC)
- 1041-Gold Ores
- Application ID
- 544377
- NOI processed
- Dec 21, 2021
- Termination effective
- Sep 24, 2026
- Last certified
- Dec 15, 2021
- Facility size
- 83 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 544377 | Industrial | Terminated | Dec 21, 2021 | Sep 24, 2026 | Dec 15, 2021 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- North Yuba River
- 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.
3 distinct measurements across 3 parameters, most recent sample Mar 15, 2022.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2021 | 3 | 3 | 0 | Mar 15, 2022 | Mar 15, 2022 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 1 | 1 | Mar 15, 2022 | Mar 15, 2022 | Results |
| pH | SU | 1 | 0 | Mar 15, 2022 | Mar 15, 2022 | Results |
| Total Suspended Solids (TSS) | mg/L | 1 | 0 | Mar 15, 2022 | Mar 15, 2022 | Results |
All results (3 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Mar 15, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1179143 | |
| Mar 15, 2022 | pH | 6.69 | SU | Effluent | Qualifying Storm Event | 1179143 | ||
| Mar 15, 2022 | Total Suspended Solids (TSS) | 2.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1179143 |
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 16, 2023 – Jul 16, 2026 | Oct 21, 2026 | All violations |
| Enforcement actions | 10 | 10 issued · 0 draft · 0 withdrawn, rescinded or superseded | Sep 09, 2024 – Sep 30, 2026 | Oct 21, 2026 | All actions |
| Inspections | 0 | inspections, not findings | — | Oct 21, 2026 | |
| Annual reports | 1 | certified reports (contents not shown) | 2021 – 2021 | 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 (15 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Sep 30, 2026 | Enforcement actions | 473511 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Jul 22, 2026 | Enforcement actions | 470738 | NOV (Notice of Violation) | Active | |
| Jul 16, 2026 | Violations | 904815 | Late Report | Violation | Report |
| Jul 01, 2026 | Enforcement actions | 471233 | 2nd NNC - AR (Second Notice of Non-Compliance (annual report)) | Active | |
| Mar 03, 2026 | Enforcement actions | 469470 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Active | |
| Sep 10, 2025 | Enforcement actions | 463598 | NOV (Notice of Violation) | Active | |
| Aug 08, 2025 | Enforcement actions | 457874 | NOV (Notice of Violation) | Active | |
| Jul 15, 2025 | Violations | 893345 | Late Report | Violation | Report |
| Oct 29, 2024 | Enforcement actions | 455205 | 2nd NNC - AR (Second Notice of Non-Compliance (annual report)) | Active | |
| Oct 29, 2024 | Enforcement actions | 455312 | 2nd NNC - AR (Second Notice of Non-Compliance (annual report)) | Active | |
| Sep 09, 2024 | Enforcement actions | 454366 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Active | |
| Sep 09, 2024 | Enforcement actions | 454499 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Active | |
| Jul 16, 2024 | Violations | 890128 | Late Report | Violation | Report |
| Jul 16, 2023 | Violations | 889995 | Late Report | Violation | Report |
| Jul 14, 2022 | Annual reports | 1171685 | Annual report 2021 | — |
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.