Lake, 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 Lake in California · Population: 68,139
Lake, 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 24/100 (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 550 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 32 and a peak AQI of 67 in 2024, with 99% 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 | 361 (99%) | 2 | 0 | 67 |
| 2023 | 357 (98%) | 6 | 0 | 67 |
| 2022 | 359 (99%) | 4 | 0 | 76 |
| 2021 | 348 (98%) | 7 | 0 | 157 |
| 2020 | 341 (97%) | 6 | 1 | 190 |
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 |
|---|---|---|
| HIGHLANDS MUTUAL WATER COMPANY | 7,772 | 10 |
| HIDDEN VALLEY LAKE CSD | 6,235 | 1 |
| KONOCTI COUNTY WATER DISTRICT | 5,928 | 0 |
| LAKEPORT, CITY OF | 4,762 | 0 |
| MT. KONOCTI MUTUAL WATER COMPANY | 4,360 | 3 |
| KELSEYVILLE CO WATERWORKS DISTRICT 3 | 4,102 | 0 |
| LAKE COUNTY CSA 21 - NORTH LAKEPORT | 4,046 | 0 |
| COBB AREA COUNTY WATER DISTRICT | 3,515 | 1 |
| NICE MUTUAL WATER COMPANY | 2,929 | 0 |
| CLEARLAKE OAKS COUNTY WATER DISTRICT | 2,359 | 6 |
| LAKE COUNTY CSA 20 - SODA BAY | 2,003 | 0 |
| CALLAYOMI COUNTY WATER DISTRICT | 1,598 | 1 |
| LAKE COUNTY CSA 2 - SPRING VALLEY | 1,531 | 3 |
| BUCKINGHAM PARK WATER DISTRICT | 1,521 | 8 |
| LOWER LAKE COUNTY WATER DISTRICT | 1,326 | 0 |
| UPPER LAKE COUNTY WATER DISTRICT | 989 | 0 |
| LOCH LOMOND MUTUAL WATER CO | 693 | 1 |
| HARBOR VIEW MUTUAL WATER COMPANY | 550 | 7 |
| Middletown Rancheria Community Water System | 487 | 1 |
| LAKE COUNTY CSA 13 - KONO TAYEE | 449 | 0 |
| Big Valley Rancheria Water District | 417 | 0 |
| ANDERSON SPRINGS CSD | 373 | 0 |
| GLENHAVEN MUTUAL WATER COMPANY | 300 | 0 |
| CLEAR WATER MUTUAL WATER COMPANY | 252 | 0 |
| WALNUT COVE MOBILE ESTATES | 200 | 0 |
| PIER 1900 HOMEOWNER'S ASSOCIATION | 152 | 1 |
| CORINTHIAN BAY MUTUAL WATER COMPANY | 150 | 1 |
| CDF-KONOCTI CONSERVATION CAMP NO. 27 | 100 | 1 |
| Upper Lake Hardisty System | 98 | 0 |
| BLUE LAKES IMPROVEMENT CLUB | 90 | 1 |
| SUNRISE SHORE MUTUAL WATER COMPANY | 83 | 0 |
| LAZY S MOBILE RANCH | 73 | 37 |
| BAYCLIFF WATER | 70 | 0 |
| VILLA BLUE ESTATES WATER DISTRICT | 60 | 0 |
| INNISFREE WATER COMPANY | 56 | 0 |
| MOUNTAIN OF ATTENTION WATER | 26 | 0 |
TRI Facilities (1)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Granite Construction Co - Highway 175 | 550 lbs |
Cities in Lake (2)
Frequently Asked Questions
What is the environmental risk level in Lake, California? ▼
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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.