Mono, CA
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.
Environmental data for Mono in California · Population: 13,169
Mono, CA is tracked across three EPA datasets covering 1 Toxics Release Inventory (TRI) facility, 36 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 25/100 (Low Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 803 lbs of reported toxic releases under EPCRA Section 313, while 16 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 19 and a peak AQI of 69 in 2024, with 93% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
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 | 341 (93%) | 25 | 0 | 69 |
| 2023 | 325 (89%) | 35 | 1 | 1829 |
| 2022 | 276 (76%) | 61 | 5 | 8368 |
| 2021 | 260 (71%) | 78 | 12 | 2971 |
| 2020 | 183 (50%) | 117 | 13 | 2088 |
Source: EPA Air Quality System (AQS) Annual AQI by County 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 (36)
| System | Population | Violations |
|---|---|---|
| MAMMOTH CWD | 8,234 | 2 |
| JUNE LAKE PUD - DOWN CANYON | 2,810 | 5 |
| JUNE LAKE PUD VILLAGE | 2,763 | 7 |
| Bishop Paiute-Shoshone Tribe | 2,735 | 3 |
| HIGHLAND MOBILE HOME PARK | 1,400 | 2 |
| USMC/MTN WARFARE TRNG CTR - BRIDGEPORT | 1,200 | 0 |
| MEADOWCREEK MUTUAL WATER COMPANY | 764 | 2 |
| LEE VINING PUBLIC UTILITY DISTRICT | 672 | 0 |
| BRIDGEPORT PUD | 524 | 93 |
| MOUNTAIN MEADOWS MWC | 505 | 0 |
| USMC - HOUSING COLEVILLE | 424 | 0 |
| LOWER ROCK CREEK MUTUAL WATER CO. | 310 | 1 |
| STARLITE COMMUNITY SERVICE DISTRICT | 241 | 0 |
| PINE CREEK VILLAGE | 240 | 42 |
| CROWLEY LAKE TRAILER PARK | 230 | 1 |
| Utu Utu Gwaitu Paiute Tribe | 222 | 45 |
| KEOUGH'S HOT SPRINGS | 175 | 5 |
| CROWLEY LAKE MUTUAL WATER COMPANY | 175 | 0 |
| WILSON CIRCLE MUTUAL WATER COMPANY | 158 | 0 |
| BIRCHIM COMMUNITY SERVICE DISTRICT | 150 | 0 |
| SIERRA GRANDE ESTATES MUTUAL WATER CO. | 138 | 2 |
| CARTAGO MUTUAL WATER COMPANY | 132 | 1 |
| CDF - OWENS VALLEY CONSERVATION CAMP | 94 | 10 |
| RAWSON CREEK MUTUAL WATER COMPANY | 90 | 0 |
| WHEELER CREST CSD | 86 | 0 |
| SIERRA EAST HOA | 84 | 24 |
| SUNLAND VILLAGE MOBILE HOME PARK | 73 | 0 |
| VALLEY VISTA MUTUAL WATER COMPANY | 70 | 0 |
| LUNDY MUTUAL WATER COMPANY | 70 | 0 |
| RANCH ROAD ESTATES MUTUAL WATER COMPANY | 65 | 0 |
| COLD WATER CANYON MWC | 65 | 0 |
| ASPENDELL MUTUAL WATER COMPANY | 60 | 0 |
| BROOKSIDE ESTATES MUTUAL WATER COMPANY | 59 | 0 |
| CHALFANT VALLEY WEST M.W.C. | 45 | 0 |
| SIERRA NORTH COMMUNITY SERVICE DISTRICT | 42 | 0 |
| VAN LOON WATER ASSOCIATION | 25 | 0 |
TRI Facilities (1)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Marine Corps Mountain Warfare Training Center | 803 lbs |
Cities in Mono (1)
Frequently Asked Questions
What is the environmental risk level in Mono, California? ▼
Are there Superfund sites in Mono? ▼
How many toxic release facilities are in Mono? ▼
What is the air quality in Mono? ▼
Is the drinking water safe in Mono? ▼
What environmental agencies cover Mono? ▼
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.