A letter names chemicals the family has never heard of
Imagine a homeowner receiving a notice that PFAS were detected in nearby groundwater. The family's well water looks, tastes, and smells normal, and an online seller promises that a generic filter will remove every contaminant. This is an illustrative scenario, not a testimonial. PFAS cannot be confirmed by appearance, and a marketing claim is not a sampling plan or proof that a particular device will meet the household's needs.
Contact the state environmental or health agency before collecting a sample. Use a state-certified laboratory that performs the PFAS drinking-water method required by that program, follow the kit instructions exactly, and keep the chain-of-custody record. If PFAS are detected, compare the result with the state agency's current guidance and arrange alternate water or treatment based on that advice rather than guessing from a public-system rule.
The short answer
EPA says private wells are not federally regulated under the Safe Drinking Water Act, even though federal PFAS drinking-water standards apply to covered public systems. Private-well owners should ask their state agency which PFAS to test, which laboratory and method to use, and what action level or response applies locally. A result should identify individual compounds, reporting limits, units, sample location, and whether quality-control requirements were met.
Until the result is interpreted, do not boil water to remove PFAS. Boiling can reduce water volume without removing the chemicals. If the agency recommends reducing exposure, use an approved alternate source for drinking, cooking, brushing teeth, and preparing infant formula, or use a filter independently certified for the PFAS reduction claim and maintain it exactly as directed.
When targeted PFAS testing makes sense
Proximity alone cannot prove contamination, and distance alone cannot rule it out because groundwater flow depends on geology, pumping, and the source. Ask the responsible agency whether a mapped plume, sampling boundary, or assistance program includes the property.
Routine annual well panels do not always include PFAS. A laboratory's broad package may also measure compounds that differ from the state's decision framework. Obtain the analyte list and method before paying for sampling.
- A state or local agency identifies PFAS in nearby groundwater or public wells
- The property is near a fire-training area, airport, landfill, manufacturing site, military facility, or known release
- A cleanup investigation includes neighboring private wells
- A previous sample detected one or more PFAS
- A home purchase involves an area with a state testing recommendation
- Treatment has been installed and performance needs verification
Why sampling instructions are unusually important
PFAS are used in many consumer and industrial materials, so sampling programs use detailed steps to reduce accidental contamination. The laboratory may restrict certain clothing treatments, food wrappers, cosmetics, markers, tubing, tape, or containers during collection. Follow its current written protocol rather than a checklist copied from another program.
Use only the supplied bottles and preservatives. Do not rinse them, transfer water to a household jar, or collect through a treatment device unless the plan specifically calls for a treated-water sample. Record the faucet, whether the sample was raw or treated, flushing instructions, date, time, sampler, and shipment conditions.
Read the laboratory report compound by compound
PFAS is a large chemical family, not one measurement. The report may list PFOA, PFOS, PFHxS, PFNA, HFPO-DA or GenX chemicals, PFBS, and other compounds. Results may be expressed in parts per trillion or nanograms per liter. Confirm units before comparing values because a unit error can change the apparent result dramatically.
A non-detect means the compound was not measured above the laboratory's stated reporting limit in that sample. It does not prove absolute absence. A detection should be reviewed with the agency, including the method, reporting limit, quality-control flags, and whether a confirmation sample is appropriate.
Private-well guidance and public-system standards are not identical
EPA established enforceable PFAS standards for public drinking-water systems, but its private-well page emphasizes that those federal requirements do not regulate an individual private well. States may adopt their own private-well actions, health advice, property-transfer rules, cleanup programs, or assistance thresholds.
Do not present a public-system standard as a universal legal limit for a private household. Ask the state agency to interpret the result and explain whether the response is advisory, cleanup-related, lender-driven, locally required, or part of a voluntary program. Save the dated guidance because PFAS policies and test methods can change.
Immediate exposure-reduction decisions
EPA advises that a household with PFAS in well water may consider an alternate source for activities in which water is swallowed. The exact response depends on the measured compounds and concentrations, the state program, and household circumstances. People with specific health concerns should discuss them with a health professional rather than relying on a treatment salesperson.
Bathing, laundry, irrigation, and other uses may receive different recommendations from drinking and food preparation. Ask the health agency which uses matter for the reported result. Do not assume that every household tap requires the same interim response or that bottled water is automatically PFAS-free without supplier information.
Compare treatment by the verified claim
EPA describes granular activated carbon, reverse osmosis, and ion-exchange technologies as options that can reduce some PFAS. Performance varies by compound, water chemistry, flow, design, media, and maintenance. Point-of-use treatment protects a selected drinking tap; point-of-entry treatment handles much larger flow and creates different monitoring and disposal questions.
Look for independent certification of the exact model under the PFAS reduction claim, commonly associated with NSF/ANSI 53 or 58, and check the certification directory rather than relying on a logo. EPA cautions that certification standards may not guarantee reduction to the newest federal levels, so the provider should state the tested influent, reduction endpoint, capacity, flow, and compounds covered.
Raw and treated samples answer different questions
A raw-water sample before treatment characterizes the well and establishes the load entering the device. A treated sample shows water at a particular outlet under the current operating conditions. For a whole-house system, sampling may be needed at both the entry and a representative tap. For a point-of-use unit, the protected faucet and bypassed fixtures must be clear.
Ask the laboratory and installer when to collect the first verification sample, how often to retest, and what result triggers media replacement. A pressure gauge, timer, or filter-change light does not directly measure PFAS breakthrough. Keep paired results so performance can be evaluated over time.
Maintenance and spent media require a plan
PFAS treatment captures chemicals rather than making maintenance optional. Carbon, membrane, or resin capacity can be shortened by competing contaminants and higher water use. The design should use a complete raw-water analysis and account for sediment, iron, manganese, hardness, organic matter, pressure, and household demand.
Request a written replacement schedule, sampling schedule, sanitizing procedure, warranty, and instructions for concentrate, backwash, cartridges, and spent media. Disposal rules can differ, particularly in cleanup areas. Do not open media vessels or discard concentrated waste based on generic advice.
Questions for the laboratory and treatment provider
A useful proposal separates source testing, exposure reduction, treatment design, and verification. Be cautious of anyone who guarantees removal of all PFAS, promises health outcomes, or discourages independent post-treatment testing.
If the property is part of a known release investigation, coordinate with the responsible agency before installing equipment. Sampling, funding, access agreements, and responsibility for long-term maintenance may depend on preserving the official process.
- Is the laboratory state-certified for the required PFAS drinking-water method?
- Which compounds and reporting limits are included?
- Does the state provide sampling, reimbursement, or alternate water?
- Is the proposed device certified for the exact PFAS claim?
- Which compounds were included in certification testing?
- What flow, capacity, and incoming concentration support the design?
- Where are raw and treated sample taps?
- When will performance be verified by laboratory testing?
- What triggers filter or media replacement?
- How are concentrate and spent media handled?
Frequently asked questions
Can I taste or smell PFAS? No. Laboratory analysis is necessary.
Will boiling remove PFAS? No. Do not use boiling as PFAS treatment.
Does a refrigerator filter remove PFAS? Only if that exact model has a verified PFAS reduction certification and is used within its rated conditions.
Should I test every year? Follow the state agency's schedule, source-risk information, and treatment verification plan.
Does a detection mean someone will become ill? EPA explains that risk depends on concentration, amount and duration of exposure, and individual factors. Discuss the result with health authorities and a clinician for personal concerns.
Can a softener remove PFAS? A standard hardness softener should not be assumed to provide a verified PFAS reduction. Select treatment from certified claims and laboratory data.