Can an at-home test strip detect PFAS?

No. The EPA regulates PFOA and PFOS at 4 parts per trillion, and there is no test strip or color-change kit on the market that can measure anything near that range. PFAS detection requires a laboratory instrument (liquid chromatography with tandem mass spectrometry) running EPA Method 533 or 537.1. Any product sold as an at-home PFAS strip cannot give you a number you can act on.

What lab method should a PFAS test use?

For drinking water, look for EPA Method 533 or EPA Method 537.1. Both are validated drinking water methods. Method 533 captures shorter-chain PFAS that Method 537.1 can miss, so if you are near a manufacturing or AFFF firefighting-foam source, ask for 533 specifically. Avoid labs that quote a wastewater or soil method for a tap water sample.

How much does a PFAS water test cost?

A PFAS-specific mail-in panel typically runs about $100 to $250, more than a single-metal test because the lab work is more involved. Some labs sell PFAS as an add-on to a broader panel. The price reflects the instrument time, not a markup, so a much cheaper PFAS test is a reason to check what method it actually uses.

How do I collect a PFAS water sample without ruining it?

Use only the container the lab sends, which has PFAS-free HDPE or polypropylene caps, never a PTFE or Teflon-lined lid. Do not wear waterproof or stain-resistant clothing while sampling, skip hand lotion and cosmetics that day, and keep fast-food wrappers away from the bottle. PFAS are in many everyday products, and at parts-per-trillion levels they can contaminate the sample. Follow the lab kit instructions exactly.

Should private well owners test for PFAS?

The 2024 EPA rule covers public water systems, not private wells, so no one tests a private well for you. If your well is near a military base, airport, industrial site, landfill, or farmland where biosolids were applied, a one-time certified PFAS test is the only way to know your level. City customers can often check utility data first, but a well owner has to test.

How to Test Your Water for PFAS

Health disclaimer: This page explains how PFAS testing works. It is not medical advice. PFAS health questions, especially for pregnant people, infants, and immunocompromised individuals, warrant a conversation with your doctor. Private well owners are responsible for their own water quality monitoring.

You cannot test for PFAS the way you test for lead or hardness. There is no strip you dip, no color chart, no five-minute kit that gives you a usable answer. The EPA regulates PFOA and PFOS at 4 parts per trillion, and nothing you can do at your kitchen sink measures down to that range. PFAS testing happens in a lab, on an instrument, or it does not happen at all.

That is the single most useful thing to know before you spend money. The arsenic and lead pages on this site explain why strips fall short for those contaminants. With PFAS the gap is wider. A part per trillion is roughly one drop in 20 Olympic swimming pools, and that is the level the regulation cares about.

Why At-Home Kits Do Not Work for PFAS

Test strips work by chemistry that changes color in proportion to how much of something is present. That approach has a floor. For lead, the floor is around the 15 ppb action level. For arsenic, strips struggle below 50 ppb. PFAS limits are measured in parts per trillion, three orders of magnitude lower, and no colorimetric reaction is sensitive enough to register that.

If you see a product marketed as an at-home PFAS test, look closely at what it actually claims to measure. Some measure total organic fluorine or general water quality and let the marketing imply PFAS. Neither tells you whether your water is above or below the 4 ppt limit for PFOA and PFOS. For a number you can base a decision on, the sample has to go to a lab.

The Lab Methods That Count: EPA Method 533 and 537.1

When you order a PFAS test or read a lab’s panel description, look for one of two method numbers.

EPA Method 537.1 was the first widely used drinking water method for PFAS. It covers 18 compounds, including PFOA and PFOS, using solid phase extraction followed by liquid chromatography and tandem mass spectrometry (LC-MS/MS).

EPA Method 533 is newer and uses an isotope dilution anion exchange technique. It captures shorter-chain PFAS that 537.1 can miss, around 25 compounds. If your concern is a known source like a former military base that used AFFF firefighting foam or a fluorochemical plant, Method 533 gives you the fuller picture, because shorter-chain replacements show up near those sites.

Both are legitimate drinking water methods. The one to avoid is a lab quoting a method built for wastewater, soil, or biosolids (for example, Method 1633) when you handed them a tap water sample. Those methods exist for a reason, but they are not the right tool for what comes out of your faucet. If you are buying a mail-in kit, the best mail-in water tests comparison lists which services run 533 versus 537.1 and what each panel covers.

Find a Certified Lab

PFAS analysis is specialized. Not every state-certified drinking water lab runs it in house, and many subcontract it. You want a lab certified for the method you choose under the Safe Drinking Water Act.

Two ways to get there:

The EPA maintains a certified drinking water laboratory locator. Search by state and ask any lab on the list whether they offer Method 533 or 537.1 for PFAS.
National mail-in services such as Tap Score (SimpleLab), National Testing Laboratories, and Eurofins-affiliated labs ship a collection kit, include prepaid return shipping, and post results online. These are the easiest option if your nearest local lab does not handle PFAS.

Expect a PFAS panel to cost roughly $100 to $250. That is more than a single-metal test, because the LC-MS/MS work is involved and the lab has to guard the whole process against background contamination. A PFAS test priced like a basic strip kit is worth a second look at the method it claims to use.

How to Collect a PFAS Sample Without Contaminating It

This is the step people get wrong, and with PFAS the stakes are unusual. The chemicals are in so many everyday products that you can contaminate the sample with things you would never think about. The lab is measuring at parts per trillion. A trace from your own hands or clothing can show up.

Use the container the lab sends. Do not substitute a bottle from home. Certified PFAS kits use HDPE or polypropylene bottles with PFAS-free caps. Never use a lid lined with PTFE or Teflon, the material is itself a fluoropolymer and will defeat the test.

On collection day, follow the kit instructions, and add these PFAS-specific habits that standard EPA sampling guidance calls for:

Do not wear waterproof, water-repellent, or stain-resistant clothing while sampling. Gore-Tex jackets and treated work pants are common PFAS sources.
Skip hand lotion, sunscreen, and cosmetics that morning. Many contain fluorinated ingredients.
Keep fast-food wrappers, greaseproof packaging, and Teflon cookware away from the sampling area.
Do not let the inside of the cap or the bottle rim touch your skin, gloves, or any surface.

Many PFAS kits include a field blank, a sealed bottle of PFAS-free water you open and reseal alongside your real sample. The lab uses it to confirm nothing in your environment contaminated the collection. If your kit includes one, handle it exactly as instructed and ship it back with the sample.

For whether to flush the tap first, follow the lab’s written protocol, because it depends on whether they want a first-draw or flushed sample. Then seal, label with your name and the date, and mail the same day you collect.

What Your Results Mean

When the report comes back, find the rows for the regulated compounds. PFAS results are reported in parts per trillion (ppt), which is the same as nanograms per liter (ng/L).

The 2024 EPA rule sets enforceable limits of 4 ppt each for PFOA and PFOS, 10 ppt each for PFNA, PFHxS, and GenX (HFPO-DA), and a hazard index of 1.0 for certain mixtures. The 2024 EPA PFAS drinking water rule explainer walks through each number and the compliance timeline for utilities.

Two points matter when you read your own result. First, the maximum contaminant level goal for PFOA and PFOS is zero. The EPA set the enforceable limit at 4 ppt because that is the lowest level current methods can reliably measure, not because 4 ppt is a threshold where risk disappears. A result below 4 ppt is below the federal limit. It is not a guarantee of no risk. Second, the rule covers public water systems only. If you tested a private well, there is no legal limit that applies to you, but the same 4 ppt figure is a reasonable reference point for deciding whether to treat.

What to Do If You Find PFAS

If your test shows PFAS, the next decision is treatment, and the certification matters as much as the test method did.

A reverse osmosis system certified to NSF/ANSI 58 is the most consistent point-of-use option. Independent testing puts RO reduction of PFOA and PFOS in the 90 to 99% range. For non-RO filters, look for NSF/ANSI 53 certification specifically for PFOA and PFOS (or total PFAS) reduction. This testing came out of NSF Protocol P473, developed in 2016 and folded into NSF/ANSI 53 and 58 in 2017. Some pitcher and under-sink carbon filters carry it, and standard carbon pitchers without that certification do not reliably reduce PFAS. The how to remove PFAS guide compares certified options at different price points.

The honest summary: test first, treat second, and match the certification to the result. The main PFAS contaminant page covers where these chemicals come from and who is most exposed. If your well is near a base, airport, industrial site, or land where biosolids were applied, a one-time certified PFAS test is the only way to replace a guess with a number.

Sources

EPA, “EPA PFAS Drinking Water Laboratory Methods” (Method 533 and 537.1): epa.gov/pfas/epa-pfas-drinking-water-laboratory-methods
EPA, “Method 533: Determination of Per- and Polyfluoroalkyl Substances in Drinking Water”: epa.gov/dwanalyticalmethods
EPA, “Per- and Polyfluoroalkyl Substances (PFAS) Final PFAS National Primary Drinking Water Regulation”: epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas
EPA, “Certified Laboratory Locator for Drinking Water”: epa.gov/dwlabcert

Health disclaimer: WaterAnswer.com provides general information only. This page is not medical advice. For questions about PFAS exposure and your health, consult your doctor. For treatment decisions, consult a certified water treatment professional.