Arapahoe County, CO
The federal environmental record for Arapahoe County (population 656,061): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
1
Superfund NPL sites
5
federal cleanup sites
5
PFAS-detecting water systems
5
TRI facilities
59
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Lowry Landfill | Arapahoe County | on the NPL | 09/21/1984 |
Drinking water: PFAS testing
Public water systems serving Arapahoe 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 |
|---|---|---|
| ARAPAHOE CNTY WWWA CO0203002 | PFPeA: 7.9 ng/L PFHxA: 6.8 ng/L PFBS: 6.1 ng/L | above final limit |
| AURORA CITY OF CO0103005 | PFBA: 7.8 ng/L PFPeA: 7.2 ng/L PFHxA: 5.6 ng/L | detected |
| EAST CHERRY CREEK VALLEY WSD CO0103035 | PFBA: 6.2 ng/L PFPeA: 4.7 ng/L | detected |
| ENGLEWOOD CITY OF CO0103045 | PFBA: 6.4 ng/L PFPeA: 5.8 ng/L PFBS: 5.8 ng/L | detected |
| INVERNESS WSD CO0203012 | PFBA: 6.9 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
5 facilities in Arapahoe filed TRI reports for 2024, totalling 322 lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| U.S. DOD USAF BUCKLEY SFB CO | AURORA | Naphthalene, Ethylbenzene | 271 lb |
| UNICIRCUIT INC | LITTLETON | Copper And Copper Compounds, Lead And Lead Compounds | 46 lb |
| DFA DAIRY BRANDS FLUID LLC D/B/A MEADOW GOLD DAIRY | ENGLEWOOD | Nitric acid | 5 lb |
| AMERICAN STAINLESS STEEL CORP | ENGLEWOOD | - | 0 lb |
| BRANNAN READY MIX - SOUTH READY MIX | ENGLEWOOD | Lead And Lead Compounds | 0 lb |
Underground fuel tanks
EPA's UST Finder records 803 tank facilities in Arapahoe: 620 tanks in service and 1,680 closed. 753 fuel releases are on record, of which 59 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Arapahoe 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 Arapahoe, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- BUCKLEY AIR FORCE BASEAURORA
- COLORADO DISPOSAL INCAURORA
- FORMER LOWRY AFB TITAN MISSILE SITE 1 COMPLEX 1BAURORA
- FORMER LOWRY AFB TITAN MISSILE SITE 3 COMPLEX 2BDEER TRAIL
- QUINCY AVENUE SODIUMENGLEWOOD