PFAS testing for property owners: when to test, how sampling works and what results mean

Does my property need PFAS testing?

Not every property does. AES says testing is strongly recommended for sites near airports, military bases, landfills and industrial facilities, or where firefighting foams have been used. A private well, a property sale or a lender’s request can also be reasons.

PFAS are a group of manmade chemicals. Missouri DNR says they repel both water and oil and have been used since the 1940s in products such as non-stick cookware, carpet, clothing, furniture fabrics, cleaning products and some firefighting foams. DNR also says many PFAS break down very slowly and can build up in people, animals and the environment. Our PFAS glossary entry gives a short definition.

Use this table to decide whether to test and what to test first.

Where do I start: public water, a private well or my site?

Start with the water source. If you use a public system, ask the utility for its PFAS results. Missouri DNR’s PFAS Viewer Tool maps voluntary sampling of public systems. If you have a private well, contact your state agency and a certified lab.

Missouri DNR says it has run PFAS monitoring projects for public supplies since 2013. Its PFAS Viewer Tool identifies where voluntary sampling took place in public drinking water systems. Look up your area before paying for a test.

EPA gives steps for private wells. It says to contact your state environmental or health agency for advice and for a list of state-certified labs that use EPA-developed methods. It also says individuals can contact their state laboratory certification program to learn whether the state has certified labs for PFAS analysis.

For land, soil or groundwater, the question changes. You are not testing what comes out of a tap. You are asking whether a release happened on or near your property and where it went. That takes a site assessment before any sampling, described next.

What does a PFAS site assessment involve?

A site assessment reviews site history, known PFAS use and likely pathways before anyone collects a sample. AES describes it as the first step, used to find potential sources, the extent of contamination and the right sampling points. See AES’s PFAS assessment page.

A good assessment answers four questions in writing:

1. What happened here? Past owners, industrial processes, firefighting training or waste handling.
2. Which PFAS use is known? Foams, coatings, plating or manufacturing.
3. Where could PFAS have moved? Groundwater flow, runoff, drainage and neighboring sites.
4. Where should samples come from? Wells, soil borings, surface water or sediment.

PFAS move easily in water. AES says they are persistent and mobile in the environment, which is why proper sampling matters before you design a cleanup. Skipping the assessment can mean paying to sample the wrong spots.

How are PFAS samples collected?

Trained staff collect samples with equipment that contains no fluorinated plastics, then ship them to an accredited lab under chain of custody. PFAS are common in everyday materials, so careless sampling can add PFAS to a clean sample.

AES describes its practice on its PFAS sampling page. Its technicians use specialized non-fluorinated equipment to prevent cross-contamination. Its kits are stainless steel, polypropylene or HDPE, never Teflon or PTFE. It uses pre-cleaned containers and field blanks, plus low-flow sampling for groundwater. AES says its technicians avoid PFAS-containing materials from gloves and bottles to clothing and field gear, and keep documentation and chain-of-custody records.

EPA names the standard drinking water methods. The table adds AES’s published methods for other media.

Ask the lab or consultant which method applies to your sample, which compounds it measures and what reporting limit it can reach. A lab that cannot answer is not ready to test PFAS.

How do I read the results?

Results come in parts per trillion, or ppt, and list each PFAS compound with a detection limit. Compare PFOA and PFOS to EPA’s drinking water limit of 4.0 ppt each. That limit covers public water systems. EPA sets no recommended standard for private wells.

The glossary defines parts per trillion and MCL, the maximum contaminant level. EPA’s 2024 drinking water rule set enforceable levels for six PFAS. EPA’s proposed 2026 extension keeps the PFOA and PFOS levels at 4.0 ppt each. Our guide to the PFAS drinking water rule gives the current status.

A result is a snapshot of one place and day. Ask your consultant to explain the numbers in plain words, to say what they compare against and to recommend next steps. Our post on how to read a PFAS lab report goes line by line.

How long does PFAS testing take, and what does it cost?

AES says most testing results are available within two to four weeks, but turnaround varies with the number of samples and laboratory schedules. AES does not publish a PFAS testing price. The cost depends on the number of samples, the media and the compounds measured.

Budget for more than the lab fee. A full project includes the site review, field work, shipping, lab analysis and the written interpretation. Ask for a quote that lists each part, so you can compare providers on equal terms.

Plan the timeline backward from your deadline. If a sale or permit depends on results, order the work early, because the lab queue is outside anyone’s control.

What happens if PFAS are found?

You decide next steps with your consultant and, where rules apply, your state agency. AES says that if PFAS are found, it helps you understand the results and discuss next steps, which may include more assessment or remediation. For water, treatment may follow.

The common options for water are covered on AES’s PFAS treatment technologies page. AES’s water treatment page names granular activated carbon, ion exchange and reverse osmosis, and explains why testing data picks the right one. Our glossary covers the technology terms.

If PFAS are in your drinking water and you are concerned, EPA’s proposed-rule Q&A says to contact your water utility for its levels and what it is doing to reduce them. If you worry about health, talk to your doctor.

How does PFAS testing differ for a business or industrial site?

Commercial and industrial sites test more media and need defensible records. AES says it serves municipalities, industrial facilities and private property owners, and that its work includes site assessments, sampling and laboratory analysis, then data interpretation and reporting.

AES names the usual pathways PFAS take into water on its drinking water page. Use them to decide what to sample:

Sites with these histories may find PFAS at the source and downstream. AES says PFAS are soluble and mobile, so they can spread over long distances underground. AES also publishes separate pages for airports, landfills and schools if one fits your property.

What questions should I ask a PFAS testing provider?

Ask about the method, the lab, the sampling controls and the report. A provider who answers clearly is easier to trust. These questions separate careful work from careless work.

Avoid sampling alone if the result will support a sale, a permit or a legal claim. Poor sampling can invalidate the data.

What mistakes should property owners avoid?

Most testing problems come from skipped planning, not from the lab. Avoid these five errors.

1. Sampling before you know the source. A site review shows where to sample. Without it, you may test the wrong spots and pay twice.
2. Using the wrong bottle or gear. PFAS appear in common materials. Use the lab’s kit or a trained sampler.
3. Reading one number as the whole story. One result is a snapshot of one place and day. Ask what it compares against.
4. Ignoring the detection limit. A “not detected” result only means below the lab’s reporting limit.
5. Waiting until a deadline. Lab time and field work take weeks. AES says most results arrive within two to four weeks, so order early.

Keep every lab report, chain-of-custody form and invoice. Those records protect you if a buyer, lender or regulator asks later.

Next step

Ready to scope a test? Call AES at (314) 865-2662 or use the quote form at /contact. AES provides PFAS sampling and analysis for property owners across Missouri. Start with the PFAS testing page for the full service.