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Review government records associated with Clearlake, California.
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Check your water bill for your utility name and confirm the reporting year. See EPA’s guide to finding your annual water quality report.
Public water-system records for Clearlake, CA from EPA SDWIS.
Clearlake Oaks County Water District
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City appears in system name · Serves 2,359 people
Data from EPA SDWIS
Reviewed: source records as of Q1 2026
EPA UCMR5 — No PFAS detection records shown for these water systems
Open data source: EPA UCMR5DoD PFAS — No investigation records shown for this report
Open data source: DoD PFASNo health-relevant impairment records shown among the assessment records in this report.
Reviewed: source records as of 2026
To investigate water contamination, check the sampling locations, dates and results below. For tap water records, see Drinking water quality above.
Reviewed: source records as of 2026
Review historical EPA air pollution records, including monitoring and facility emissions where available. For current conditions, check local air quality on AirNow.
Lake County
Assessment year: 2020
According to EPA, a cancer risk of 30-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 30 may develop cancer from that exposure. This is in addition to cancer risk from all other causes.
Top modeled source groups
Data from EPA AirToxScreen
No EPA nonattainment designation records shown for this report.
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Cloverdale
Annual mean: 6.7 Micrograms/cubic meter (25 C)
Observation year: 2025
Cortina Indian Rancheria
Annual mean: 3.2 Micrograms/cubic meter (LC)
Includes measurements flagged for exceptional events.
Observation year: 2025
Lakeport-S. Main Street
Annual mean: 0.034 Parts per million
Observation year: 2025
Data from EPA AQS
EPA records for current, proposed and formerly listed Superfund sites on the National Priorities List (NPL).
Open data source: Search EPA ECHOEPA FRS Registry ID 110009329164
Reported: Nov 2021
Reviewed: source query run Nov 2026
State environmental agencies maintain cleanup site databases that include state Superfund, voluntary cleanup, and brownfield remediation programs. These programs track additional sites beyond those on the federal NPL.
3 sites with active cleanup or investigation
OLD HIGHWAY 53, CLEARLAKE
0.5 miles away · LAKE County
Reported: Nov 2026
6945 Old Highway 53, CLEARLAKE
1.9 miles away · LAKE County
Reported: Nov 2026
3660 & 3680 Boxwood Street, 3661 Acacia Street, Clearlake
1.1 miles away · LAKE County
Reported: Nov 2026
Data from EPA ECHO
Facilities with hazardous-waste handler records under RCRA in the reviewed 5-mile city-center search area. Active handler status is separate from air, water, or other ECHO compliance violations, which are shown in their own sections.
Active RCRA handler records in the reviewed city search area
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
No MSHA mine or extraction site records shown for this report.
Lake County, CA
EPA Radon Zone Map (June 2024 release)
Lake County is EPA Radon Zone 3 (low potential). EPA defines Zone 3 counties as having predicted average indoor screening levels below 2 pCi/L.
Radon levels can vary from home to home, so EPA recommends testing the property to know its indoor level.
FEMA flood zones describe mapped flood hazards. Look up a specific address with FEMA.
Minimal flood hazard — outside the 1% and 0.2% annual chance floodplains.
Results use an earlier stored RMP inventory. Current EPA ECHO location coverage is unverified.
No EPA ECHO RMP facility records with a usable location matched this city report.
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Lake County, CaliforniaPop. 68,191
County Health Rankings edition: 2024
Premature Death
Poor or Fair Health
Poor Physical Health Days
Poor Mental Health Days
Adult Smoking
Adult Obesity
Air Pollution - Particulate Matter
Drinking water violation indicator
Diabetes Prevalence
Life Expectancy
| Indicator | County | State | National |
|---|---|---|---|
| Premature Death | 11,808 | 6,373 | 7,972 |
| Poor or Fair Health | 19.1% | 15.8% | 14.2% |
| Poor Physical Health Days | 4.3 | 3.1 | 3.3 |
| Poor Mental Health Days | 6.1 | 4.7 | 4.8 |
| Adult Smoking | 16.3% | 8.8% | 15.0% |
| Adult Obesity | 33.7% | 27.8% | 34.0% |
| Air Pollution - Particulate Matter | 3.1 | 7.1 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 10.5% | 10.8% | 9.6% |
| Life Expectancy | 74.6 | 79.9 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Clearlake.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 7 violations for Clearlake Oaks County Water District.
Check your water bill to identify the utility serving your address. Ask that utility about current drinking water advisories.
Nearby EPA monitoring stations provide annual air quality measurements for Clearlake.
The monitoring station at Cloverdale recorded an annual average of 6.7 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The monitoring station at Cortina Indian Rancheria recorded an annual average of 3.2 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
The monitoring station at Lakeport-S. Main Street recorded an annual average of 0.034 Parts per million for ozone in 2025.
The radon data for Clearlake covers Lake County. EPA places this area in Zone 3, with a predicted average indoor radon screening level below 2 picocuries per liter.
This city report shows 1 Superfund site: Sulphur Bank Mercury Mine.
No brownfield sites were returned for this city report.
The county data for Clearlake reports a life expectancy of 74.6 years in Lake County, California.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Clearlake reports 11,808 years of life lost to deaths before age 75 per 100,000 residents in Lake County, California. This measure adds up the years lost to early deaths and adjusts for differences in population age.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Clearlake lists fine-particle pollution (PM2.5) at 3.1 micrograms per cubic meter in Lake County, California.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.