Lake County, CA
The federal environmental record for Lake County (population 67,878): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
1
Superfund NPL sites
3
federal cleanup sites
1
PFAS-detecting water systems
1
TRI facilities
4
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Sulphur Bank Mercury Mine | Clear Lake | on the NPL | 08/30/1990 |
Drinking water: PFAS testing
Public water systems serving Lake with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| KONOCTI COUNTY WATER DISTRICT CA1710006 | PFBA: 8.2 ng/L PFPeA: 3.9 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
1 facilities in Lake filed TRI reports for 2024, totalling 227 lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| GRANITE CONSTRUCTION CO - HIGHWAY 175 | LAKEPORT | Polycyclic aromatic compounds | 227 lb |
Underground fuel tanks
EPA's UST Finder records 32 tank facilities in Lake: 95 tanks in service and 0 closed. 99 fuel releases are on record, of which 4 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Lake as Zone 3, the lowest predicted indoor radon (under 2 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for Lake, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- CLEARLAKE MERCURYCLEARLAKE
- RED ELEPHANT MINEMIDDLETOWN
- USCG LORAN C STA MIDDLETOWNMIDDLETOWN