PFAS Testing for Water and Consumer Products — What Manufacturers Need to Know

PFAS testing has moved from an emerging concern to a regulatory mandate faster than most manufacturers anticipated. In 2020, most companies had never tested a product for per- and polyfluoroalkyl substances. By 2026, PFAS testing is either required or actively expected across drinking water, food contact materials, textiles, cosmetics, and children’s products. If you manufacture, import, or distribute products in any of these categories and haven’t built PFAS testing into your quality program, you’re behind.

I’ve spent the last three years helping companies navigate the PFAS testing landscape — from water utilities scrambling to meet EPA’s final PFAS rule to consumer product brands trying to understand which state laws apply to them. The regulatory picture is complex and still evolving, but the testing science is well established. Here’s what you need to know.

What Are PFAS and Why the Regulatory Focus

PFAS are a class of over 14,000 synthetic fluorinated compounds. The carbon-fluorine bond that gives them their useful properties — water resistance, heat stability, oil repellency — also makes them extraordinarily persistent in the environment. They don’t break down in water treatment, soil, or biological systems in any meaningful timeframe. That’s the “forever chemicals” label.

The health concerns are well documented: PFOA and PFOS, the two most studied PFAS compounds, are linked to kidney and testicular cancer, thyroid disease, immunotoxicity, and developmental effects. But the regulatory conversation has expanded well beyond those two legacy compounds to include GenX chemicals (HFPO-DA), PFBS, PFHxS, PFNA, and dozens of others.

The critical thing manufacturers need to understand: PFAS regulations are not waiting for complete scientific consensus on all 14,000+ compounds. Regulators are acting on what’s known, and the direction is consistently toward lower limits and broader compound coverage.

EPA’s Final PFAS Drinking Water Rule

EPA’s National Primary Drinking Water Regulation (NPDWR) for PFAS, finalized in April 2024, establishes legally enforceable Maximum Contaminant Levels (MCLs) for six PFAS compounds:

• PFOA: 4 parts per trillion (ppt)
• PFOS: 4 ppt
• PFHxS: 10 ppt
• PFNA: 10 ppt
• HFPO-DA (GenX): 10 ppt
• Mixture of PFHxS, PFNA, HFPO-DA, and PFBS: Hazard Index of 1

Those 4 ppt limits for PFOA and PFOS are at the edge of analytical detection capability. This isn’t an aspirational target — it’s a compliance requirement with enforceable deadlines. Public water systems must complete initial monitoring by 2027-2029 depending on system size, with full compliance required by 2029.

For water utilities and municipalities, this means you need a laboratory that can reliably quantify PFAS at low-ppt levels with established method detection limits (MDLs) well below the MCLs. A lab reporting an MDL of 4 ppt for PFOA is not sufficient to demonstrate compliance with a 4 ppt MCL — you need MDLs at roughly half the MCL or lower to have confidence in the result.

EPA Analytical Methods for PFAS in Water

Two EPA methods dominate PFAS water testing:

EPA Method 537.1 — Determination of Selected Per- and Polyfluorinated Alkyl Substances in Drinking Water by Solid Phase Extraction and Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS). This method covers 18 PFAS analytes and was developed specifically for finished drinking water. It uses solid-phase extraction (SPE) with a weak anion exchange cartridge, followed by LC-MS/MS analysis with isotope dilution quantification.

EPA Method 533 — Determination of Per- and Polyfluoroalkyl Substances in Drinking Water by Isotope Dilution Anion Exchange Solid Phase Extraction and Liquid Chromatography/Tandem Mass Spectrometry. Method 533 was developed to complement 537.1 by covering shorter-chain PFAS and GenX chemicals that 537.1 doesn’t capture well. It uses a modified SPE approach optimized for these more mobile compounds.

For regulatory compliance with the final PFAS rule, EPA specifies that laboratories must use either Method 533 or 537.1 (or both, depending on the analyte list). In practice, many laboratories run both methods to cover the full suite of regulated compounds, since neither method alone covers all six regulated PFAS plus the Hazard Index mixture.

EPA Method 1633 — Analysis of Per- and Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid, Biosolids, and Tissue Samples by LC-MS/MS. This is the newer multi-matrix method that covers 40 PFAS analytes across water, soil, biosolids, and tissue. Method 1633 is increasingly specified for NPDES permits, site investigations, and non-drinking-water applications. It’s not yet required under the drinking water rule but is becoming the standard for wastewater and environmental matrices.

State PFAS Regulations — The Patchwork Problem

Federal rules set the floor, but many states have gone further. This creates a compliance patchwork that multi-state manufacturers must navigate carefully:

California — Proposition 65 listings for PFOA and PFOS (no safe harbor level), plus AB 1200 banning intentionally added PFAS in food packaging (effective 2023) and AB 652 restricting PFAS in children’s products and textiles.

Maine — LD 1503 prohibits the sale of products containing intentionally added PFAS, with a phased implementation: food packaging (2023), carpets/rugs and fabric treatments (2025), and all products by 2030 unless an exemption is granted. Maine requires manufacturers to report all products sold in the state that contain intentionally added PFAS.

Minnesota — The Amara’s Law (2023) bans intentionally added PFAS in cookware, carpets, cleaning products, cosmetics, dental floss, fabric treatments, food packaging, juvenile products, menstruation products, ski wax, textile furnishings, and upholstered furniture, with staggered effective dates from 2025-2032.

New York — Enacted bans on PFAS in food packaging, apparel, and cookware, with varying effective dates. Also has aggressive drinking water MCLs of 10 ppt for PFOA and PFOS that preceded the federal rule.

Vermont, Washington, Connecticut, Colorado, Maryland, Rhode Island — Each has some form of PFAS product restriction, typically starting with food packaging and expanding to other categories.

The practical consequence: if you sell products nationally, you’re subject to the most restrictive state standard. Testing for the absence of intentionally added PFAS — or at minimum below state-specific thresholds — is the only way to demonstrate compliance.

PFAS Testing for Consumer Products

Water testing has established EPA methods, but consumer product PFAS testing uses a different analytical toolkit:

Total Organic Fluorine (TOF) — Combustion Ion Chromatography (CIC) quantifies the total fluorine content of a sample. This is a screening method: if TOF is below the detection limit (typically 10-50 ppm depending on the matrix), no PFAS are present at meaningful concentrations. If TOF is elevated, targeted analysis identifies which specific PFAS compounds are present.

Targeted PFAS Analysis by LC-MS/MS — Identifies and quantifies specific PFAS compounds. Standard panels typically cover 30-50 individual PFAS. This gives you compound-specific concentrations but can only find what it’s looking for — novel or unusual PFAS won’t appear unless they’re in the target list.

Total Oxidizable Precursor (TOP) Assay — Converts PFAS precursor compounds to measurable terminal PFAS through oxidation, then analyzes by LC-MS/MS. This captures PFAS that wouldn’t be detected by standard targeted analysis because they exist as precursors that transform into regulated compounds.

For most consumer product manufacturers, a tiered approach makes sense: screen with TOF first, then run targeted analysis if fluorine is detected. This avoids the cost of full targeted analysis on every sample while providing high confidence that PFAS-free claims are supportable.

Selecting a PFAS Testing Laboratory

PFAS testing requires specialized capability. Not every environmental or chemistry lab can do it well. Here’s what to evaluate:

Accreditation under EPA Methods — For drinking water compliance, the lab must hold state or third-party accreditation (TNI/NELAC or state equivalent) for EPA 537.1 and/or 533. Verify the specific methods on their scope of accreditation. Many labs claim PFAS testing capability without holding method-specific accreditation.

Method Detection Limits — Ask for the lab’s current MDLs for each regulated compound. For drinking water compliance, MDLs should be at least 2x below the MCL. A lab reporting an MDL of 2 ppt for PFOA is adequate for a 4 ppt MCL; a lab reporting 3.5 ppt is marginal. MDLs vary by instrument, analyst, and lab procedures — they’re not standardized.

Blank Contamination Control — PFAS are ubiquitous laboratory contaminants. PTFE tubing, certain plasticware, even lab furniture can introduce PFAS into samples. Qualified PFAS labs use PFAS-free sample collection materials, dedicated PFAS-free laboratory spaces, and rigorous blank monitoring. Ask about their blank contamination rates and corrective action procedures.

Sample Collection Protocols — PFAS sample collection requires PFAS-free containers (typically HDPE bottles without PTFE-lined caps), no contact with aluminum foil, no use of certain sunscreens or cosmetics by field personnel, and specific preservative and holding-time requirements. A qualified lab should provide detailed sampling instructions and PFAS-free sample kits.

Turnaround Time — PFAS testing demand has surged. Standard turnaround at many labs is 3-4 weeks. Rush service is available at premium cost but capacity is constrained industry-wide. Plan your testing timelines accordingly.

What This Means for Your Testing Program

If you’re a water utility, the compliance clock is running. Identify a laboratory with demonstrated capability under EPA 537.1 and 533, confirm their MDLs meet your needs, and begin baseline monitoring now. Don’t wait for the compliance deadline to discover your lab can’t deliver results at the required detection levels.

If you’re a consumer product manufacturer, audit your supply chain for PFAS exposure. Any product containing fluoropolymer coatings, water/oil/stain-resistant treatments, or non-stick surfaces should be tested. Start with Total Organic Fluorine screening — it’s faster and less expensive than targeted analysis and provides the first-line data you need.

If you sell products into states with PFAS product restrictions, document your testing and maintain records demonstrating either the absence of intentionally added PFAS or compliance with applicable thresholds. “We didn’t know” is not a defensible position when state laws include manufacturer reporting requirements.

Building PFAS Testing Into Your Quality System

PFAS testing isn’t a one-time event. Regulations are expanding — both in the number of compounds covered and the product categories affected. Build PFAS into your routine testing program:

1. Map your regulatory exposure — Which states do you sell into? Which product categories are covered? What are the current limits and effective dates?
2. Audit your supply chain — Where could PFAS enter your products? Raw materials, packaging, processing equipment, coatings, treatments?
3. Establish baseline data — Test current products and incoming materials to understand your starting position.
4. Set specifications — Define PFAS limits for incoming materials and finished products based on applicable regulations, with a safety margin.
5. Monitor ongoing — Regular testing at defined intervals, with increased frequency for new suppliers or material changes.

Aurora TIC works with manufacturers across water, food, consumer products, and environmental sectors to build PFAS testing programs that meet current requirements and anticipate regulatory expansion. Whether you need help selecting the right laboratory, interpreting results, or building PFAS specifications into your supply chain quality program, that’s precisely the kind of work we do.

The PFAS regulatory landscape will continue to tighten. The manufacturers who build testing capability now will have a compliance advantage — and a market advantage — over those who wait.