Why Test for PFAS Yourself?

Your water utility's annual Consumer Confidence Report may include some PFAS data, but it has limitations. Testing happens at the treatment plant or distribution points, not at your tap. And many smaller utilities are still phasing in PFAS monitoring under the EPA's 2024 rule, with full compliance not required until 2029 (in May 2026 the EPA proposed letting systems request two more years, to 2031, for PFOA and PFOS, and proposed rescinding the limits for PFHxS, PFNA, GenX, and the Hazard Index mixture).

If you are on a private well, there is no utility testing at all. The EPA does not regulate private wells, and PFAS testing is entirely your responsibility.

Independent testing tells you exactly what is coming out of your faucet. This is especially important if:

Check your water quality to see if PFAS has been reported in your area before you decide on testing.

Types of PFAS Tests

Certified Laboratory Testing

Cost: roughly $335 to $850 at a consumer-facing lab such as Tap Score Turnaround: 2 to 4 weeks Accuracy: Highest available

This is the gold standard. You collect a water sample following the lab's instructions, ship it in a provided container, and receive a detailed report showing individual PFAS compound concentrations measured in parts per trillion (ppt).

Reputable labs that offer residential PFAS testing include:

When choosing a lab, confirm they are accredited under ISO 17025 and use EPA Method 533 or 537.1. These methods are specifically designed for PFAS analysis in drinking water and can detect individual compounds at levels as low as 2 ppt.

At-Home Screening Kits

Cost: $30 to $150 Turnaround: Minutes to days (depending on type) Accuracy: Lower, suitable for screening only

Some companies sell at-home PFAS screening kits that provide a general indication of contamination. These include:

At-home kits are best used as a first step. If they indicate PFAS presence, follow up with certified lab testing for accurate, actionable data.

How to Collect a Proper Sample

Sample collection technique matters. Contamination of your sample can lead to false results, either inflating or masking actual PFAS levels. Follow these guidelines:

Step-by-step collection

  1. Use only the container provided by the lab. PFAS-free containers are essential. Standard plastic bottles may contain trace PFAS from manufacturing. Do not use glass containers with Teflon-lined caps.
  2. Run the cold water tap for at least 2 minutes before collecting. This flushes standing water from pipes and gives you a sample of the flowing supply.
  3. Avoid collecting first-draw water unless you are specifically testing for lead (which requires a different protocol).
  4. Do not touch the inside of the bottle or cap. Your hands may have PFAS from cosmetics, hand lotion, or waterproof clothing.
  5. Fill to the line indicated on the container and seal tightly.
  6. Label the sample with the date, time, and collection point (e.g., "kitchen cold tap").
  7. Ship promptly. Most labs recommend shipping within 24 to 48 hours of collection. Use the prepaid shipping label and ice pack if provided.

What not to do

What to Test For

A comprehensive PFAS panel should include at minimum:

Lab panels typically cover 18 to 40 PFAS compounds depending on the method (EPA 537.1 covers 18, EPA 533 covers 25, and EPA 1633 covers 40), which is helpful because contamination often involves a mixture. The EPA's regulated six compounds are the priority, but broader panels can reveal contamination patterns that indicate specific sources (e.g., AFFF firefighting foam vs. industrial discharge).

Interpreting Your Results

When your lab report arrives, here is how to read it:

Key numbers to compare

| Compound | EPA MCL | Your result | Action | |---|---|---|---| | PFOA | 4 ppt | Check your report | Above 4 ppt = exceeds federal limit | | PFOS | 4 ppt | Check your report | Above 4 ppt = exceeds federal limit | | PFHxS + PFNA + HFPO-DA + PFBS | Hazard Index of 1.0 | Check your report | Combined ratio above 1.0 = exceeds limit |

What the results mean

Context for your numbers

In EPA's UCMR 5 nationwide sampling (2023 to 2025), among the roughly 3,400 water systems with any PFAS detected, the median system's highest combined PFAS sample was about 24 ppt. About 490 of those systems recorded a sample at 100 ppt or more, and 17 topped 1,000 ppt. If your results are in single digits, filtration with a certified pitcher or faucet filter may be sufficient. If levels exceed 50 ppt, an under-sink reverse osmosis system is recommended.

When to Retest

Check your water quality to compare your test results with reported data for your zip code.

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.