PFAS Contamination in Idaho: 10 ZIP Codes Tested
10 ZIPs tested · 2 exceeding limits (20%)
Data source: EPA UCMR 3/5, SDWIS, ECHO, DOD Last verified: 2026-06-03
PFAS Contamination Summary
| Metric | Value |
|---|---|
| ZIP codes with PFAS detections | 10 |
| ZIP codes exceeding EPA limits | 2 (20%) |
| Superfund sites | 9 |
| Military bases linked to PFAS | 2 of 10 |
| Testing coverage | 3% of state ZIP codes |
| Untested ZIP codes | 307 |
Most Common PFAS Compounds Detected
| Compound | ZIP Codes with Detections |
|---|---|
| PFPeA | 6 |
| PFHxA | 6 |
| PFHxS | 6 |
| PFBS | 5 |
| PFOS | 5 |
| PFNA | 2 |
Worst-Affected Areas in Idaho
The following ZIP codes have the highest number of PFAS detections in Idaho:
| Rank | ZIP Code | City | PFAS Types | Total Detections | Exceeds EPA Limit |
|---|---|---|---|---|---|
| 1 | 83704 | Boise | 7 | 21 | Yes |
| 2 | 83714 | Garden City | 7 | 15 | Yes |
| 3 | 83648 | Mountain Home A F B | 4 | 10 | No |
| 4 | 83642 | Meridian | 2 | 4 | No |
| 5 | 83646 | Meridian | 2 | 4 | No |
| 6 | 83661 | Payette | 2 | 4 | No |
| 7 | 83680 | Meridian | 2 | 4 | No |
| 8 | 83858 | Rathdrum | 2 | 4 | No |
| 9 | 83501 | Lewiston | 3 | 3 | No |
| 10 | 83274 | Shelley | 1 | 1 | No |
Check your ZIP code on our PFAS map to see if your area is affected.
Sources of PFAS Contamination in Idaho
PFAS contamination in Idaho comes from several key sources:
Military Installations
2 military bases in Idaho are linked to PFAS contamination, primarily from the use of aqueous film-forming foam (AFFF) in firefighting training exercises.
Superfund Sites
Idaho has 9 Superfund sites that may contribute to PFAS contamination. Major sites include:
- EASTERN MICHAUD FLATS CONTAMINATION
- IDAHO NATIONAL ENGINEERING LABORATORY USDOE
- MONSANTO CHEMICAL CO SODA SPRINGS PLANT
- KERR MCGEE CHEMICAL CORP SODA SPRINGS PLANT
- BLACKBIRD MINE
Industrial and Municipal Sources
Beyond military and Superfund sites, PFAS contamination in Idaho also stems from:
- Industrial facilities that manufactured or used PFAS-containing products
- Airports that used AFFF firefighting foam
- Wastewater treatment plants that received PFAS-laden industrial discharge
- Landfills accepting PFAS-containing consumer products
Idaho PFAS Regulations
Idaho does not currently have state-specific PFAS drinking water standards. Residents are protected by the federal EPA PFAS rule (April 2024), which sets MCLs of 4 ppt for PFOA and PFOS, with water systems required to comply by 2029.
Some states have moved faster than the federal government. Check our PFAS contaminant guide for the full federal standard and how it compares to state-level action.
Testing Gaps
Only 3% of ZIP codes in Idaho have been tested for PFAS. That leaves 307 ZIP codes with no public PFAS data.
The EPA requires all public water systems to complete PFAS monitoring by 2027. Until then, residents in untested areas may want to consider independent water testing or a certified PFAS filter.
What Idaho Residents Can Do
1. Check Your Water
Enter your ZIP code on ZipCheckup to see PFAS detections, violations, and health risk scores for your area.
2. Get Your Water Tested
If your ZIP code has PFAS detections or is in an untested area, consider a certified lab test. Look for labs accredited under EPA Method 533 or 537.1. Home test kits cost $150-$350 and cover the six regulated PFAS compounds.
3. Install a Certified Filter
The most effective home treatment options for PFAS removal:
- Reverse osmosis (RO) systems remove 90-99% of PFAS (NSF 58 certified)
- Granular activated carbon (GAC) filters remove 60-95% depending on the compound (NSF 53 certified)
- Ion exchange systems are effective for short-chain PFAS
Use our Filter Matcher tool to find NSF-certified filters that remove PFAS.
4. Check for Lead Risk Too
Many areas with PFAS contamination also face lead service line risks. Use our Lead Risk Calculator to assess your home's lead exposure risk.
Frequently Asked Questions
How many ZIP codes in Idaho have PFAS in their water?
Based on EPA data, 10 ZIP codes in Idaho have detectable PFAS in their public water supply. Of those, 2 (20%) exceed the federal MCL of 4 ppt for PFOA or PFOS.
Is my water safe to drink in Idaho?
It depends on your location. 2 ZIP codes in Idaho exceed federal PFAS limits. Enter your ZIP code on ZipCheckup to see your area's specific results. Even if your water meets current standards, you may want to use a certified filter as PFAS accumulate in the body over time.
Does Idaho have its own PFAS limits?
Idaho does not currently have state-specific PFAS drinking water standards. The federal EPA rule (April 2024) sets MCLs of 4 ppt for PFOA and PFOS, and all public water systems must comply by 2029.
What is the best water filter for PFAS in Idaho?
Reverse osmosis (RO) systems certified to NSF 58 are the most effective option, removing 90-99% of PFAS compounds. Granular activated carbon (GAC) filters certified to NSF 53 also reduce PFAS significantly. Use the ZipCheckup Filter Matcher tool to find certified filters for your specific contaminants.
Where does PFAS contamination in Idaho come from?
The primary sources include 2 military bases that used AFFF firefighting foam, 9 Superfund sites, industrial facilities, airports, and wastewater treatment plants. PFAS are also found in landfill leachate from consumer products containing these chemicals.
Why hasn't my area been tested for PFAS?
Only 3% of ZIP codes in Idaho have public PFAS testing data. The EPA requires all public water systems to complete PFAS monitoring by 2027 under the new federal rule. Until then, you can get independent lab testing (EPA Method 533 or 537.1) for $150-$350.