Napa County, CA
The federal environmental record for Napa County (population 133,216): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
2
federal cleanup sites
1
PFAS-detecting water systems
3
TRI facilities
12
open tank releases
Drinking water: PFAS testing
Public water systems serving Napa 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 |
|---|---|---|
| CALISTOGA, CITY OF CA2810002 | PFOS: 12.2 ng/L PFOA: 6.4 ng/L PFPeA: 4.2 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
3 facilities in Napa filed TRI reports for 2024, totalling 650 lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| WESTLAKE ROYAL STONE LLC - NAPA | AMERICAN CANYON | Lead And Lead Compounds | 650 lb |
| FOLEY PRODUCTS CO - NAPA | AMERICAN CANYON | Lead | 0 lb |
| VULCAN MATERIALS CO NAPA QUARRY | NAPA | Benzo[g,h,i]perylene | 0 lb |
Underground fuel tanks
EPA's UST Finder records 44 tank facilities in Napa: 133 tanks in service and 0 closed. 343 fuel releases are on record, of which 12 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Napa 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 Napa, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- PACIFIC UNION COLLEGEANGWIN
- U.S. BUREAU OF RECLAMATION LAKE BERRYESSANAPA