Ada County, ID
The federal environmental record for Ada County (population 524,673): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
7
federal cleanup sites
3
PFAS-detecting water systems
16
TRI facilities
6
open tank releases
Drinking water: PFAS testing
Public water systems serving Ada 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 |
|---|---|---|
| CAPITOL WATER CORP ID4010022 | PFNA: 51 ng/L PFOS: 9.8 ng/L PFOA: 5.9 ng/L | above final limit |
| GARDEN CITY WATER AND SEWER SYSTEM ID4010066 | PFOS: 28.2 ng/L PFHxS: 25.4 ng/L PFNA: 8.2 ng/L | above final limit |
| MERIDIAN WATER DEPT ID4010097 | PFOS: 4.9 ng/L PFHxS: 3.8 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
16 facilities in Ada filed TRI reports for 2024, totalling 318k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| MICRON TECHNOLOGY INC | BOISE | Ammonia, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 130k lb |
| CS BEEF PACKERS | KUNA | Ammonia, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 80k lb |
| THE AZEK CO | BOISE | Zinc compounds | 49k lb |
| DARIGOLD-BOISE | BOISE | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Nitric acid | 27k lb |
| ARMY NATIONAL GUARD ORCHARD COMBAT TRAINING CENTER RANGES | BOISE | Copper, Lead And Lead Compounds | 25k lb |
| MARATHON PIPE LINE - BOISE | BOISE | n-Hexane, Toluene | 4k lb |
| ICCO EAGLE | EAGLE | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead | 2k lb |
| IMC EAST BOISE | BOISE | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead | 1k lb |
| BOISE FACILITY | BOISE | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Polycyclic aromatic compounds | 58 lb |
| CREATION TECHNOLOGIES | MERIDIAN | Lead And Lead Compounds | 1 lb |
| SUNROC CORP BADGER CONCRETE BATCH PLANT | BOISE | Lead | 0 lb |
| SUNROC CORP - JOPLIN FACILITY | BOISE | Lead | 0 lb |
| TRINITY TRAILER MANUFACTURING INC | BOISE | - | 0 lb |
| BASALITE | MERIDIAN | Lead And Lead Compounds | 0 lb |
| ERGON ASPHALT & EMULSIONS INC. - BOISE | BOISE | - | 0 lb |
| SUNROC CORP - CORRAL ASPHALT PLANT | BOISE | Polycyclic aromatic compounds | 0 lb |
Underground fuel tanks
EPA's UST Finder records 786 tank facilities in Ada: 607 tanks in service and 1,691 closed. 333 fuel releases are on record, of which 6 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Ada as Zone 2, moderate predicted indoor radon (2 to 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 Ada, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- ARMY NATIONAL GUARD ORCHARD COMBAT TRAINING CENTER RANGESBOISE
- FORMER DRY CLEANER (ESQUIRE & USTICK)BOISE
- LOGAN STREET MERCURY RESPONSEBOISE
- ORCHARD STREET MERCURYBOISE
- S E BOISE APPLE ST GW SITEBOISE
- USDOI BLM NATIONAL GUARD IMPACT AREA (ORCHARD RANGE)ORCHARD
- VAN WATERS & ROGERS (#8512270110)BOISE