Tap Water Test Panel: Lead, PFAS & Arsenic — What It Actually Tells You

The short answer

A home tap-water panel for lead, PFAS, and arsenic is a mail-in lab test — you collect a sample following the kit's instructions and send it to a certified lab, not a dip-strip you read at the sink. Labs bundle these three specifically because they don't show up the same way: lead is almost always a plumbing problem inside your own house, PFAS is almost always an upstream contamination problem in the source water, and arsenic is almost always a geology problem that shows up in groundwater and private wells. A municipal water report can rule two of those in or out at the source; it can't tell you what's happened to the water between the street and your faucet. That's what this panel is for.

What the three thresholds actually mean

These aren't the same kind of number, and treating them as interchangeable is where most confusion about a result starts.

Lead: 15 parts per billion — and it's not a safety line. EPA's Lead and Copper Rule sets an action level of 15 ppb (0.015 mg/L) for lead in drinking water. That number is a treatment trigger, not a determination that water below it is safe: it's the level at which, if more than 10% of sampled taps in a system exceed it, the utility has to take corrosion-control action and notify the public. EPA's own health-based goal for lead — the level with zero known risk — is set at zero, because the agency states there's no exposure level below which lead is considered free of harm. EPA finalized a rule in October 2024 (the Lead and Copper Rule Improvements) that lowers the action level to 10 ppb, with compliance phasing in around 2027, on top of a 10-year mandate to replace lead service lines nationwide.

PFAS: two chemicals with a firm number, four with an open question as of this writing. In April 2024, EPA finalized the first enforceable federal drinking-water limits for PFAS: 4.0 parts per trillion each for PFOA and PFOS, plus 10 ppt limits for four related chemicals (PFHxS, PFNA, and HFPO-DA/GenX) and a combined "Hazard Index" limit for mixtures of those plus PFBS. As of August 2026, that's only half-settled. EPA has said it will keep the PFOA and PFOS limits at 4.0 ppt, though it has proposed — not yet finalized — extending water systems' compliance deadline from 2029 to 2031. Separately, EPA has proposed rescinding the limits on the other four PFAS substances entirely; that proposal's public comment period closed July 20, 2026, and hasn't been decided. In plain terms: PFOA/PFOS have a real, currently-in-force number behind them. The other four PFAS are regulated today but under active EPA proposal to be un-regulated — worth knowing if a result comes back for one of those and you're trying to gauge how much weight to put on it.

Arsenic: 10 parts per billion, and it only applies to public water systems. EPA set arsenic's drinking-water limit at 10 ppb (0.010 mg/L) in 2001, with utilities required to comply since January 2006. EPA sets the health-based goal at zero, same rationale as lead. The limit only governs public water systems, though — the EPA does not regulate private wells at all. If your water comes from a well, there's no federal requirement that it ever gets tested for arsenic; that responsibility sits entirely with the homeowner.

What affects your risk

Lead is a plumbing-age problem more than a source-water problem. Homes with lead service lines, or fixtures and solder installed before lead solder was banned in 1986, are the ones where water can pick up lead between the main and the faucet — even when the utility's source water tests clean. A system-wide report can look fine while a specific house doesn't.

PFAS tends to track upstream sources: manufacturing sites, airports, and military installations that used PFAS-containing firefighting foam are the most common contamination points, and they show up in the water supply, not in household plumbing. Where you live relative to one of those sites matters more than the age of your house.

Arsenic is largely a geology story. It occurs naturally in some groundwater, which is why it's more of a concern for private wells than municipal systems — and, as above, wells are exactly the water source the federal standard doesn't reach.

Cost

Free option first: check your Consumer Confidence Report, and ask your utility directly. Every community water system is required to publish an annual water quality report with its most recent sampling results, including lead — that's free and doesn't require a request. EPA's own consumer guidance also directs people with specific concerns to contact their water utility, since some utilities and states run testing-assistance or lead service line replacement programs; that varies by location and isn't a guaranteed nationwide right, and it still won't capture what's happening inside your own home's pipes rather than the system average.

Paid testing. Lead and PFAS don't come bundled cheaply in one panel — checking marketplace listings in September 2026, a comprehensive certified-lab panel covering lead, arsenic, and around a hundred other analytes runs roughly $270; PFAS is a separate, more specialized test on top of that, running around $340 on its own. There isn't a single $50–$150 product that covers all three well — that's a real cost, not a minor markup over EPA's cited $15–$100 for a single-contaminant test. If only one of the three is a real risk factor for your home (see below), a single-analyte test is far cheaper than either bundle.

What SafeMama recommends

Start with the free report — it's already sitting in your utility's records and takes a phone call or a website visit to get. From there, match the test to the actual risk factor rather than buying every panel at once: a private well points to arsenic, plumbing that predates 1986 points to lead, and a location near a known industrial or military site points to PFAS. The comprehensive lab panel is worth it if more than one of those applies or you'd rather test everything at once; PFAS is worth ordering specifically only where that risk factor is real, since it's the most expensive single test of the three.

If a result comes back elevated on any of the three, the immediate next step isn't panic — it's filtration matched to what was actually found. See SafeMama's guide to choosing a home water filter for how to match a filter to a specific contaminant rather than buying whatever's marketed hardest.