If you rely on a private well for drinking water, you're on your own when it comes to PFAS testing. The EPA's UCMR program only covers public water systems – the estimated 43 million Americans on private wells have no federal testing mandate. PFAS is just one of several contaminants a well owner should check for; for the complete testing schedule, see our guide to what to test your private well for and how often.
Private wells draw from groundwater aquifers – the same underground water sources that PFAS contaminates. Risk factors include:
### The Hidden Problem Unlike public water systems, private wells have: - ❌ No federal testing requirements - ❌ No mandatory treatment standards - ❌ No public reporting of results - ❌ No utility responsible for water quality
You are the utility. Testing and treatment are your responsibility.
### Step 1: Choose a Certified Lab Use an EPA Method 533 or 537.1 certified laboratory. Recommended options:
| Lab | Cost | PFAS Compounds | Turnaround | |-----|------|-----------------|------------| | Tap Score | $149-$299 | 30-40 PFAS | 10-14 days | | SimpleLab | $225 | 40+ PFAS | 14-21 days | | Your state lab | $50-$200 | Varies | 2-4 weeks | | TestAmerica/Eurofins | $200-$400 | 40+ PFAS | 7-14 days |
### Step 2: Collect the Sample Properly PFAS testing requires special protocols to avoid false positives:
Before sampling: - Don't wear waterproof clothing (many contain PFAS) - Don't use sunscreen or cosmetics (may contain PFAS) - Don't eat food from PFAS-containing packaging
Collection process: 1. Run cold water for 3-5 minutes to flush the plumbing 2. Use ONLY the collection bottles provided by the lab (PFAS-free containers) 3. Don't touch the inside of the bottle or cap 4. Fill according to lab instructions (usually to the line, no air bubbles) 5. Cap immediately and label
After collection: - Ship within 24 hours using provided packaging - Keep cold (ice packs, not dry ice) - Use provided chain-of-custody form
### Step 3: Interpret Your Results Results come in parts per trillion (ppt) for each PFAS compound:
| Level | Meaning | Action | |-------|---------|--------| | 0-2 ppt | Below detection limits | Monitor annually | | 2-4 ppt | Detected, below EPA limit | Consider filtration, retest in 6 months | | 4-10 ppt | Above EPA limits | Install treatment system | | 10+ ppt | Significantly elevated | Immediate treatment; investigate source | | 70+ ppt | EPA health advisory (legacy) | Use alternative water source immediately |
### Immediate Actions: 1. Switch to bottled water for drinking and cooking (temporarily) 2. Contact your state health department – they may offer assistance 3. Install a point-of-use treatment system (see below) 4. Test neighboring wells – contamination plumes affect multiple properties
Reverse Osmosis (Point-of-Use) - Cost: $300-$800 - Removes: 94-99% of PFAS - Best for: Kitchen tap, drinking water - Maintenance: Filter replacement every 6-12 months ($50-$100)
Granular Activated Carbon (Whole-House) - Cost: $1,000-$5,000 - Removes: 70-90% of PFAS - Best for: Whole-house treatment - Maintenance: Carbon bed replacement every 12-24 months
Ion Exchange (Point-of-Entry) - Cost: $3,000-$10,000 - Removes: 90%+ of PFAS - Best for: High contamination levels - Maintenance: Resin replacement every 1-3 years
Some states offer financial help for private well owners:
Check with your state environmental agency for current programs.
### How often should I test my well for PFAS? Annually if you're near a potential contamination source. Every 3-5 years for general monitoring.
### Can my neighbor's septic system cause PFAS in my well? Potentially. Household products containing PFAS enter septic systems and can leach into groundwater, though typically at lower levels than industrial sources.
### Does well depth affect PFAS contamination risk? Deeper wells are sometimes less vulnerable, but PFAS can migrate to significant depths depending on geology. Depth alone isn't a guarantee of safety.
### Should I test for other contaminants too? Yes. When testing for PFAS, also consider testing for bacteria, nitrates, arsenic, and lead – all common in private wells.
You can Check your water quality by zip code to see if your area is affected. If you're looking for solutions, Find water filters that remove PFAS certified for removal. Well water can contain PFAS too – read our PFAS contamination guide for more details.
Check your water now. Enter your zip code at KnowYourExposure.com to see what contaminants have been detected in your local water supply – including PFAS, lead, and other regulated compounds.