How to Test Your Water for PFAS at Home

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.

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:

Your utility has reported PFAS detections
You live near a military base, airport, or industrial facility
You rely on a private well
You want to verify that your water filter is working

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: $150 to $400 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:

SimpleLab (Tap Score): Offers a PFAS test panel starting around $250. Results include concentrations for 30+ individual PFAS compounds. Easy online ordering and sample kit delivery.
Eurofins: One of the largest environmental testing labs globally. PFAS panels available for residential customers.
PACE Analytical: Offers EPA Method 533 and 537.1 testing, the same methods used by utilities.
State-certified labs: Many state health departments maintain lists of certified labs that can test for PFAS. Check your state's environmental agency website.

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:

Immunoassay-based test strips: These can detect the presence of certain PFAS compounds but typically have a higher detection threshold (around 20 to 70 ppt) and cannot distinguish individual compounds. They are useful as a quick check but should not replace lab testing if you want precise numbers.
Mail-in screening panels: Some kits act as simplified versions of lab testing. You collect a sample and mail it to the company's partner lab for analysis. These often test for fewer compounds than a full lab panel.

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

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.
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.
Avoid collecting first-draw water unless you are specifically testing for lead (which requires a different protocol).
Do not touch the inside of the bottle or cap. Your hands may have PFAS from cosmetics, hand lotion, or waterproof clothing.
Fill to the line indicated on the container and seal tightly.
Label the sample with the date, time, and collection point (e.g., "kitchen cold tap").
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

Do not collect from a hot water tap (PFAS can behave differently at higher temperatures, and hot water tanks can introduce other contaminants)
Do not collect in a container that previously held food or other liquids
Do not wear waterproof or stain-resistant clothing while collecting, as these can shed PFAS particles
Do not use a filter-equipped faucet unless you are specifically testing the filter's output

What to Test For

A comprehensive PFAS panel should include at minimum:

PFOA (perfluorooctanoic acid): EPA MCL is 4 ppt. One of the two most studied and regulated PFAS.
PFOS (perfluorooctane sulfonic acid): EPA MCL is 4 ppt. Widely used in firefighting foam (AFFF).
PFHxS (perfluorohexane sulfonic acid): Regulated under the EPA's hazard index mixture standard.
PFNA (perfluorononanoic acid): Part of the hazard index group.
HFPO-DA (GenX chemicals): A replacement for PFOA used in manufacturing. Part of the hazard index group.
PFBS (perfluorobutane sulfonic acid): A short-chain PFAS, part of the hazard index group.

Many labs test for 30 or more PFAS compounds, 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

ND (not detected): The compound was below the lab's detection limit, typically 2 ppt. This is the best outcome.
Detected below MCL: The compound is present but below the federal limit. While legally compliant, you may still want to filter your water, especially if levels are above 2 ppt. The EPA set MCLGs (goals) at zero for PFOA and PFOS, meaning any detectable amount carries some risk.
Detected above MCL: The compound exceeds the federal limit. Install a certified filter (NSF P473) and contact your water utility if you are on public water. If you are on a private well, consult a water treatment professional.

Context for your numbers

The median PFAS level in contaminated U.S. water systems is approximately 10 to 20 ppt for combined PFAS. Highly contaminated areas near military bases or industrial sites have recorded levels of 100 to 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

After installing a filter: Test the filtered water to confirm your system is working. Compare pre-filter and post-filter results.
Annually: PFAS levels can change due to seasonal groundwater fluctuations, changes in contamination sources, or shifts in your utility's treatment process.
After major events: If there is construction, industrial activity, or flooding near your water source, consider retesting.
If you change your water source: Moving to a new home or switching from well to municipal water (or vice versa) warrants a fresh test.

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.