Lyon, NV
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology.
Environmental data for Lyon in Nevada · Population: 60,630
TRI sites such as 21ST Century Environmental Management of Nevada LLC; Carboline Global Inc.; Kemet Blue Powder Corp; SDWIS systems such as DAYTON VALLEY WATER SYSTEM; YERINGTON CITY OF; SILVER SPRINGS MUTUAL WATER COMPANY; NPL sites such as Anaconda Copper Mine anchor Lyon, NV's EPA extract. Derived burden score 53/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Lyon include YERINGTON CITY OF; STAGECOACH GID; TOPAZ RANCH ESTATES GID AND WATER CO, while 21ST Century Environmental Management of Nevada LLC leads reported TRI pounds among local Form R filers. AQS median AQI 42 / peak 90 in 2024.
Burden score 53/100 (Moderate Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Lyon -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Lyon, NV: EPA TRI 2023 reporting year
Same facilities, both years
-36.5%
15 facilities that filed in 2022 and 2023
Whole inventory
-43.3%
79.8 thousand lb → 45.2 thousand lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Lyon, NV's total reported releases fell from 71.1 thousand lb in 2022 to 45.2 thousand lb in 2023, based on EPA TRI filings.
- Lyon, NV's off-site transfers fell from 59.7 thousand lb in 2022 to 37.5 thousand lb in 2023, based on EPA TRI filings.
- Lyon, NV's air releases fell from 11.5 thousand lb in 2022 to 7.7 thousand lb in 2023, based on EPA TRI filings.
- Lyon, NV's chemicals reported fell from 39 in 2022 to 36 in 2023, based on EPA TRI filings.
Air Quality History (2020–2024)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2024 | 310 (89%) | 39 | 0 | 90 |
| 2023 | 325 (93%) | 24 | 0 | 87 |
| 2022 | 329 (93%) | 25 | 1 | 105 |
| 2021 | 196 (73%) | 67 | 7 | 133 |
| 2020 | 308 (87%) | 39 | 5 | 328 |
Source: EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in Nevada, see the EPA's AirNow.gov.
Water Systems (7)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| DAYTON VALLEY WATER SYSTEM | 16,000 | 0 |
| YERINGTON CITY OF | 5,050 | 3 |
| SILVER SPRINGS MUTUAL WATER COMPANY | 3,070 | 0 |
| STAGECOACH GID | 1,628 | 6 |
| TOPAZ RANCH ESTATES GID AND WATER CO | 1,545 | 1 |
| Yerington (Campbell Ranch) | 512 | 20 |
| WEED HEIGHTS DEVELOPMENT | 340 | 0 |
TRI Facilities (19)
| # | Facility | Total Releases |
|---|---|---|
| 1 | 21ST Century Environmental Management of Nevada LLC | 825.6K lbs |
| 2 | Carboline Global Inc. | 139.9K lbs |
| 3 | Kemet Blue Powder Corp | 52.6K lbs |
| 4 | Qg Printing II LLC | 51.5K lbs |
| 5 | Sherwin-Williams Co | 44.0K lbs |
| 6 | Ozark Materials LLC an Ingevity Co | 12.7K lbs |
| 7 | Peterson Products | 12.5K lbs |
| 8 | Nevada Cement Co | 1.3K lbs |
| 9 | Feldmeier Equipment Inc | 716 lbs |
| 10 | Polyglass USA Inc | 492 lbs |
| 11 | Valley Joist LLC | 363 lbs |
| 12 | Johns Manville | 117 lbs |
| 13 | Pnac LLC - Fernley | 105 lbs |
| 14 | Stella-Jones Corp | 57 lbs |
| 15 | Sika - Fernley Nv | 50 lbs |
| 16 | Henry Co | 5 lbs |
| 17 | 3D Concrete LLC | 0 lbs |
| 18 | Trex - Nevada Manufacturing Operations | 0 lbs |
| 19 | X-Treme Bullets Inc. | 0 lbs |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Anaconda Copper Mine | Proposed NPL Site | 50.00 |
Cities in Lyon (7)
Frequently Asked Questions
What is the environmental risk level in Lyon, Nevada? ▼
Are there Superfund sites in Lyon? ▼
How many toxic release facilities are in Lyon? ▼
What is the air quality in Lyon? ▼
Is the drinking water safe in Lyon? ▼
What environmental agencies cover Lyon? ▼
What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.