PFAS is the hardest contaminant to catch at home, because there is nothing to catch. It has no taste, no smell, and no colour, and no test strip or countertop TDS meter can detect it. The only way to know whether PFAS is in your water is to send a sample to a lab that runs the regulatory methods. SimpleLab's Tap Score is the mail-in version of exactly that, sold as a kit you order, fill, and ship.
This is not a filter, and that is the point. A filter treats whatever comes out of your tap without telling you what was there. A lab test does the opposite: it tells you what is actually in your water so you can decide whether you need a filter at all, and which one.
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| The question | A strip or TDS meter | A Tap Score lab test | |---|---|---| | Is there PFAS in my water? | Cannot detect it at all | Measures individual PFAS in parts per trillion | | How much lead, arsenic, nitrate? | No, or a vague "total solids" number | Actual concentrations per contaminant | | How do my levels compare to health limits? | No context | Results mapped to health-based guidelines | | Is my private well safe? | Guesswork | A real reading, the only option wells have |
TDS meters measure total dissolved solids, which is a rough taste proxy, not a safety test. They cannot see PFAS, lead, or arsenic specifically, and a low TDS reading says nothing about whether a trace toxin is present. A lab test is the only tool that answers the specific question.
For the right person, yes. For everyone, no, and an honest review says so.
It diagnoses, it does not treat. The test tells you what is in your water on the day you sampled it. It does not remove anything. If it comes back clean, that is money well spent for peace of mind; if it flags a problem, you still need a filter, so budget for both.
Your public water report is the free first step. If you are on a municipal system, EPA and state records already show what has been detected system-wide, at no cost. Start there. A paid lab test earns its price when those records are silent on PFAS, when you are on a private well that no one tests, or when you want a reading of your own faucet rather than the system average.
It is a snapshot, not a monitor. Water quality shifts with the season, construction, and source changes. One test is a baseline, not a guarantee for all time.
Before you pay for a lab test, read what has already been measured in your water for free. Our water report lookup pulls the EPA and state testing records for your system, so you can see whether PFAS, lead, or other contaminants have turned up near you. If the records are thorough and clean, you may not need to test at all. If they are silent on PFAS, or you are on a well, that is exactly when a mail-in lab test is worth the money. For how the options compare, see our guide to the best water test kits and our at-home PFAS test rundown.
Can a test strip or TDS meter detect PFAS? No. No home strip or TDS meter can detect PFAS. The compounds are invisible to those tools, and only an accredited-lab test using the EPA PFAS methods can measure them.
How does the Tap Score PFAS test work? You collect a tap-water sample in the kit's bottles and mail it to an accredited lab, which analyses it using the EPA PFAS methods and returns a digital report comparing your levels to health guidelines, usually within a week or two.
Do I need a lab test if I am on city water? Often no. Your public water system already reports detected contaminants in EPA and state records, which you can read for free. A lab test is most worth it when those records do not cover PFAS, when you are on a private well, or when you want a reading of your specific tap.
Does the test remove PFAS? No. It is a diagnostic, not a treatment. If it finds PFAS, you then need a filter certified or built to reduce it, such as a reverse osmosis system.
How long do results take? Results are typically delivered digitally within one to two weeks of the lab receiving your sample.
A mail-in lab test is the only honest way to answer "is there PFAS in my water," because the contaminant is invisible to every cheaper tool. Tap Score runs the regulatory methods and hands back a report you can actually read. It is not for everyone, since municipal customers have a free public report to check first, but for well owners and for anyone whose records are silent on PFAS, it turns a guess into a number, and that number is what tells you whether to spend on a filter and which one to buy.
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