County page
Humboldt County
Humboldt County currently shows 0 Superfund sites, 28 imported facility profiles, and 2,407,941 lbs in loaded TRI releases.
Overview
What this county page is saying
This live county page is generated from the ingested EPA datasets. It merges ECHO facility compliance rows, TRI release totals, and any Superfund sites attached to Humboldt County.
The latest loaded TRI year is 2024, with 2,407,941 lbs in county-level on-site releases tied to the imported facility set.
Focus points
Design and product notes
County pages combine facility compliance history with chemical release totals.
TRI chemistry shows what is being reported, while ECHO shows who keeps drawing enforcement attention.
Superfund records add legacy cleanup context even when live contaminant detail is still sparse.
Superfund layer
Cleanup sites in this county
Facilities
Worst polluters and compliance pressure
Hycroft Mine
Significant Violation across 12 of the last 12 quarters in the imported ECHO record.
Lone Tree Mine
Violation across 12 of the last 12 quarters in the imported ECHO record.
Twin Creeks Mine
Violation across 12 of the last 12 quarters in the imported ECHO record.
Ft Mcdermitt Paiute-shoshone
Significant Violation across 12 of the last 12 quarters in the imported ECHO record.
Paradise Valley Elementary
Violation Identified across 12 of the last 12 quarters in the imported ECHO record.
Winnemucca Plant
Violation Identified across 1 of the last 12 quarters, with $13,600 in recorded penalties.
Valmy Chevron
Violation Identified across 9 of the last 12 quarters in the imported ECHO record.
Diamond Plastics-chlorinator
Significant Violation across 7 of the last 12 quarters in the imported ECHO record.
Dutchman Acres
Significant noncompliance across 7 of the last 12 quarters in the imported ECHO record.
Barrick Turquoise Ridge Inc
No Violation Identified. Last recorded ECHO inspection: 2021-06-16.
Marigold Mining Company
No Violation Identified. Last recorded ECHO inspection: 2021-06-15.
Sierra Pacific Power Co North Valmy Station
No Violation Identified. Last recorded ECHO inspection: 2025-05-14.
Sandhill Cattle Feeders Llc
Significant noncompliance across 5 of the last 12 quarters in the imported ECHO record.
Kings River Elementary School
Significant noncompliance across 5 of the last 12 quarters in the imported ECHO record.
Diamond Inn Bar
Significant noncompliance across 4 of the last 12 quarters in the imported ECHO record.
Gold Country Estates
Significant noncompliance across 4 of the last 12 quarters in the imported ECHO record.
Humboldt Conservation Camp Ndoc-pou Ro Nitrate Treatment System
Inactive across 4 of the last 12 quarters in the imported ECHO record.
Usda Usfs R04 Lye Creek Campground Usfs
Significant noncompliance across 4 of the last 12 quarters in the imported ECHO record.
Pinson Mine
No Violation Identified. Last recorded ECHO inspection: 2016-02-24.
Js Livestock
Significant Violation across 3 of the last 12 quarters in the imported ECHO record.
| Chemical | Group | Facilities | Total pounds |
|---|---|---|---|
| Lead compounds | Metals and metal compounds | 4 | 1,083,180 lbs |
| Zinc compounds | TRI-listed chemical | 1 | 419,154 lbs |
| Vanadium compounds | TRI-listed chemical | 1 | 237,334 lbs |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | TRI-listed chemical | 3 | 210,977 lbs |
| Nickel compounds | Metals and metal compounds | 1 | 108,359 lbs |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | TRI-listed chemical | 1 | 80,818 lbs |
| Mercury compounds | TRI-listed chemical | 5 | 67,145 lbs |
| Cobalt compounds | TRI-listed chemical | 1 | 57,298 lbs |
| Manganese compounds | TRI-listed chemical | 3 | 37,948 lbs |
| Propylene | TRI-listed chemical | 2 | 28,840 lbs |
| Arsenic compounds | TRI-listed chemical | 1 | 22,994 lbs |
| Ammonia | TRI-listed chemical | 2 | 17,086 lbs |
| Chromium | Metals and metal compounds | 1 | 16,331 lbs |
| Copper compounds | TRI-listed chemical | 1 | 6,670 lbs |
| Cyanide compounds | TRI-listed chemical | 4 | 6,518 lbs |
| Hydrogen cyanide | TRI-listed chemical | 2 | 6,405 lbs |
| Antimony compounds | TRI-listed chemical | 1 | 258 lbs |
| Nitric acid | TRI-listed chemical | 1 | 106 lbs |
| Naphthalene | TRI-listed chemical | 1 | 86 lbs |
| Manganese | TRI-listed chemical | 1 | 22 lbs |
Violation pages
State-level violation context tied to this county
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Clean Air Act violations in Nevada
Nevada facilities in the imported ECHO data show air-program oversight, inspections, or noncompliance signals.
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Clean Water Act violations in Nevada
Nevada facilities in the imported ECHO data show water-permit pressure, inspections, or noncompliance signals.
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RCRA violations in Nevada
Nevada facilities in the imported ECHO data show hazardous-waste or RCRA oversight signals.