Mendocino, 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 Mendocino in California · Population: 90,709
Mendocino, CA is tracked across three EPA datasets covering 2 Toxics Release Inventory (TRI) facilities, 42 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 578 lbs of reported toxic releases under EPCRA Section 313, while 20 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 43 and a peak AQI of 83 in 2024, with 67% 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 | 244 (67%) | 122 | 0 | 83 |
| 2023 | 144 (39%) | 216 | 5 | 140 |
| 2022 | 129 (35%) | 234 | 2 | 103 |
| 2021 | 210 (58%) | 147 | 6 | 185 |
| 2020 | 240 (66%) | 103 | 10 | 716 |
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 (42)
| System | Population | Violations |
|---|---|---|
| UKIAH, CITY OF | 16,607 | 0 |
| FORT BRAGG, CITY OF | 6,919 | 1 |
| WILLITS, CITY OF | 6,175 | 11 |
| MILLVIEW COUNTY WATER DISTRICT | 5,500 | 0 |
| REDWOOD VALLEY COUNTY WATER DISTRICT | 5,200 | 1 |
| WILLOW COUNTY WATER DISTRICT | 3,797 | 0 |
| BROOKTRAILS TOWNSHIP CSD | 3,632 | 0 |
| NORTH GUALALA WATER COMPANY | 2,593 | 2 |
| LAYTONVILLE COUNTY WATER DISTRICT | 1,152 | 0 |
| HOPLAND PUBLIC UTILITY DISTRICT | 1,076 | 0 |
| Coyote Valley System | 850 | 0 |
| Point Arena Rancheria | 616 | 14 |
| DOLPHIN ISLE MARINA | 560 | 0 |
| CALPELLA COUNTY WATER DISTRICT | 548 | 0 |
| POINT ARENA WATER WORKS | 459 | 0 |
| Round Valley Piner | 409 | 5 |
| ELK COUNTY WATER DISTRICT | 380 | 1 |
| WESTPORT COUNTY WATER DISTRICT | 369 | 1 |
| PINE MOUNTAIN MUTUAL WATER CO. | 310 | 0 |
| Mitomkai Tribal Water System | 300 | 0 |
| WOODSIDE RV PARK | 280 | 4 |
| RIDGEWOOD WATER SYSTEM | 265 | 1 |
| IRISH BEACH WATER DISTRICT | 254 | 1 |
| Shanel Tribal Utility District | 250 | 0 |
| RIVER ESTATES MUTUAL WATER COMPANY | 250 | 0 |
| OCEAN'S EDGE ESTATES | 250 | 0 |
| SURFWOOD MUTUAL WATER CORPORATION | 160 | 87 |
| Redwood Valley Rancheria | 152 | 1 |
| Manchester Rancheria | 100 | 10 |
| MEADOW ESTATES MUTUAL | 100 | 0 |
| LAKE VIEW MUTUAL WATER CO. | 90 | 0 |
| Round Valley Agency | 84 | 2 |
| HILLS RANCH MUTUAL WATER COMPANY | 79 | 0 |
| SHORELANDS ROAD & WATER COMPANY | 78 | 0 |
| YOKAYO TRIBE OF INDIANS | 75 | 1 |
| Original Sherwood Valley Rancheria | 60 | 5 |
| ALBION MUTUAL WATER COMPANY | 56 | 2 |
| POINT OF VIEW MUTUAL WATER CO | 56 | 0 |
| SEAFAIR ROAD AND WATER COMPANY | 50 | 1 |
| HOLLY RANCH VILLAGE | 50 | 0 |
| BIG RIVER VISTA MUTUAL WATER COMPANY | 36 | 0 |
| COVELO MOBILE HOME PARK | 30 | 1 |
TRI Facilities (2)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Mendocino Forest Products Co. LLC | 578 lbs |
| 2 | Nick Barbieri Trucking LLC DBA Redwood Coast Fuels | 0 lbs |
Cities in Mendocino (1)
Frequently Asked Questions
What is the environmental risk level in Mendocino, California? ▼
Are there Superfund sites in Mendocino? ▼
How many toxic release facilities are in Mendocino? ▼
What is the air quality in Mendocino? ▼
Is the drinking water safe in Mendocino? ▼
What environmental agencies cover Mendocino? ▼
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.