Larimer County, CO
The federal environmental record for Larimer County (population 370,771): 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
2
PFAS-detecting water systems
13
TRI facilities
21
open tank releases
Drinking water: PFAS testing
Public water systems serving Larimer 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 |
|---|---|---|
| LITTLE THOMPSON WD CO0135477 | PFOA: 4.8 ng/L | above final limit |
| CSU FOOTHILLS CAMPUS CO0235182 | PFBA: 5.9 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
13 facilities in Larimer filed TRI reports for 2024, totalling 167k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| RAWHIDE ENERGY STATION | WELLINGTON | Barium compounds (except for barium sulfate (CAS No. 7727-43-7)), Vanadium compounds | 139k lb |
| FORT COLLINS BREWERY | FORT COLLINS | Ammonia | 18k lb |
| AVAGO TECHNOLOGIES INC FORT COLLINS COLORADO | FORT COLLINS | Ethylene glycol, N-Methyl-2-pyrrolidone | 11k lb |
| HACH CO LOVELAND | LOVELAND | Lead | 25 lb |
| TANCO ENGINEERING INC. | LOVELAND | Manganese | 10 lb |
| WOODWARD INC | FORT COLLINS | Nickel, Chromium | 2 lb |
| SUMMIT VIEW READY MIX | FORT COLLINS | Lead And Lead Compounds | 0 lb |
| RANCH-WAY FEED MILLS | FORT COLLINS | - | 0 lb |
| NATIONAL INSTITUTE OF STANDARDS & TECHNOLOGY WWV/WWVB | FORT COLLINS | - | 0 lb |
| WOODWARD INC | FORT COLLINS | Chromium, Nickel | 0 lb |
| MARTIN MARIETTA - TAFT ASPHALT | FORT COLLINS | Polycyclic aromatic compounds, Benzo[g,h,i]perylene | 0 lb |
| METAL CASTINGS OF COLORADO INC. | LOVELAND | - | 0 lb |
| ADVANCED ENERGY INDUSTRIES INC | FORT COLLINS | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 527 tank facilities in Larimer: 344 tanks in service and 1,065 closed. 441 fuel releases are on record, of which 21 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Larimer as Zone 1, the highest predicted indoor radon levels (over 4 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 Larimer, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- POUDRE RIVER SITEFORT COLLINS
- ROCKY MOUNTAIN NATIONAL PARKESTES PARK
- USBR LOVELAND SERVICE AREALOVELAND