Trinity County, CA
The federal environmental record for Trinity County (population 15,670): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
3
federal cleanup sites
1
PFAS-detecting water systems
0
TRI facilities
4
open tank releases
Drinking water: PFAS testing
Public water systems serving Trinity 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 |
|---|---|---|
| WEAVERVILLE C.S.D. CA5310001 | PFOS: 19 ng/L PFHxS: 5.6 ng/L | above final limit |
On a system with detections? Testing and treatment options
Underground fuel tanks
EPA's UST Finder records 6 tank facilities in Trinity: 20 tanks in service and 0 closed. 77 fuel releases are on record, of which 4 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Trinity 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 Trinity, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- CHEEK SKYLINE LOGGINGDOUGLAS CITY
- US FOREST SVC-DRINKWATER GULCH MINE-CA0000983718HAYFORK
- US FOREST SVC-GOLDEN JUBILEE MINETRINITY CENTER