Inyo, CA
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 Inyo in California · Population: 18,803
TRI sites such as Dv Natural Resources--Briggs Mine; SDWIS systems such as INYO COUNTY PWD - LONE PINE; ROLLING GREEN UTILITIES, INC.; INYO COUNTY PWD - INDEPENDENCE anchor Inyo, CA's EPA extract. Derived burden score 18/100 (Low 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 Inyo include INYO COUNTY PWD - LONE PINE; ROLLING GREEN UTILITIES, INC.; INYO COUNTY PWD - INDEPENDENCE, while Dv Natural Resources--Briggs Mine leads reported TRI pounds among local Form R filers. AQS median AQI 61 / peak 1322 in 2024.
Burden score 18/100 (Low 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 Inyo -- 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.
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 | 90 (25%) | 246 | 17 | 1322 |
| 2023 | 106 (29%) | 236 | 13 | 786 |
| 2022 | 117 (32%) | 217 | 18 | 1551 |
| 2021 | 100 (27%) | 223 | 24 | 558 |
| 2020 | 158 (43%) | 153 | 23 | 705 |
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 California, see the EPA's AirNow.gov.
Water Systems (14)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| INYO COUNTY PWD - LONE PINE | 1,835 | 1 |
| ROLLING GREEN UTILITIES, INC. | 1,225 | 2 |
| INYO COUNTY PWD - INDEPENDENCE | 1,108 | 3 |
| BIG PINE CSD | 792 | 0 |
| Big Pine Paiute Band | 600 | 1 |
| Lone Pine | 535 | 0 |
| CHARLES BROWN WATER COMPANY | 242 | 3 |
| NPS - DEATH VALLEY, STOVEPIPE WELLS | 175 | 0 |
| NPS - DEATH VALLEY, FURNACE CREEK | 150 | 0 |
| Fort Independence | 120 | 0 |
| NPS - DEATH VALLEY, COW CREEK/NEVARES | 88 | 0 |
| NORTH LONE PINE MUTUAL WATER COMPANY | 70 | 0 |
| ABERDEEN WATER SYSTEM | 48 | 0 |
| DARWIN COMMUNITY SERVICE DISTRICT | 40 | 6 |
TRI Facilities (1)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Dv Natural Resources--Briggs Mine | 4 lbs |
Cities in Inyo (8)
Frequently Asked Questions
What is the environmental risk level in Inyo, California? ▼
Are there Superfund sites in Inyo? ▼
How many toxic release facilities are in Inyo? ▼
What is the air quality in Inyo? ▼
Is the drinking water safe in Inyo? ▼
What environmental agencies cover Inyo? ▼
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.