PFAS, Drinking Water & Federal Disclosure Rules

PFAS (per- and polyfluoroalkyl substances) — commonly called “forever chemicals” because they do not break down in the environment or the human body — have been detected in the drinking water of an estimated 200 million Americans. A 2023 USGS national study found detectable PFAS in approximately 45% of tap water samples tested across the country, including many private wells. Congress addressed this through 15 U.S.C. Chapter 160, a statute that pairs with EPA’s Safe Drinking Water Act authority to require PFAS disclosure, monitoring standards, and emerging-contaminant responses. The most visible result: EPA’s April 2024 rule setting the first-ever enforceable federal drinking-water limits — 4 parts per trillion for PFOA and PFOS, the two most widely detected PFAS compounds.

Chapter 160 does not replace the Safe Drinking Water Act, CERCLA/Superfund, or EPA’s broader PFAS agenda. Instead, it adds a specific Title 15 layer around drinking water, PFAS release disclosure, USGS performance and monitoring standards, and emerging-contaminant response.

Current Law (2026)

Legal Authority

• 15 U.S.C. ch. 160, subch. I — Drinking water: directs EPA to study and address PFAS contamination in public water systems; requires EPA to develop and publish information on PFAS treatment technologies, health effects, and occurrence data for water utilities planning compliance
• 15 U.S.C. ch. 160, subch. II — PFAS release disclosure: expands Toxics Release Inventory (TRI) reporting requirements under the Emergency Planning and Community Right-to-Know Act (EPCRA) to include PFAS compounds; facilities above reporting thresholds must annually report PFAS releases to air, water, and land in EPA's publicly accessible TRI database
• 15 U.S.C. ch. 160, subch. III — USGS performance standard: establishes requirements for U.S. Geological Survey laboratory quality standards for PFAS analysis; ensures that national occurrence data collected through USGS monitoring programs meets consistent analytical accuracy requirements, allowing direct comparisons across the country
• 15 U.S.C. ch. 160, subch. IV — Emerging contaminants: creates a framework for identifying, studying, and responding to contaminants of emerging concern (CECs) beyond PFAS; directs EPA and USGS to coordinate on monitoring and occurrence data; supports water utilities with technical assistance for treating emerging contaminants
• 15 U.S.C. ch. 160, subch. V — Other matters: includes grants and additional appropriations authority for water-system PFAS treatment, PFAS occurrence monitoring, and pilot programs for emerging contaminant control; authorizes technical assistance to small and disadvantaged water systems that face disproportionate compliance costs

How It Works

EPA’s first nationwide PFAS drinking-water standards, finalized April 10, 2024, set Maximum Contaminant Levels (MCLs) under the Safe Drinking Water Act: 4 parts per trillion (ppt) each for PFOA and PFOS — the two most studied PFAS compounds in drinking water systems (one part per trillion is one drop of water in 20 Olympic swimming pools). EPA also set 10 ppt MCLs for PFNA and PFHxS and a hazard-index approach for mixtures including GenX. These are enforceable limits, not advisory ones. Water systems must complete initial monitoring by 2027 and achieve compliance by 2029, and systems exceeding the limits must notify customers promptly. A 2023 USGS national study found detectable PFAS levels in about 45% of tap water samples — including many private wells not covered by community water system testing — underscoring why measurement standards and monitoring requirements are as important as the MCLs themselves.

The 2022 Bipartisan Infrastructure Law allocated $10 billion specifically for PFAS and emerging-contaminant water treatment — the largest federal water-infrastructure commitment in decades — to offset the estimated $1.5 billion annual compliance cost for water systems. Congress also expanded the picture beyond treatment and funding: the PFAS release-disclosure subchapter extended Toxics Release Inventory (TRI) reporting requirements to more PFAS compounds, meaning industrial PFAS releases to air, water, and land must be publicly reported annually, making contamination visible before it reaches compliance deadlines. EPA’s drinking-water rules, TRI reporting, TSCA reporting, CERCLA hazardous substance designations, and infrastructure funding all interact — see PFAS Contamination Regulation for the full regulatory picture.

How It Affects You

If you drink tap water and want to know if it’s affected: Start with your water utility’s annual Consumer Confidence Report (CCR) — public water systems are required to mail or post this each year with contaminant levels. For a broader view, the Environmental Working Group’s Tap Water Database (ewg.org/tapwater) aggregates utility testing data and shows PFAS readings for most ZIP codes. Private wells are not covered by community water testing rules — if you’re on a well, especially near a military base, airport, industrial site, or known Superfund site, independent testing through a certified lab is your only option. Testing a private well for PFAS costs approximately $150–$400 depending on the panel.

If PFAS levels at your utility are elevated: The 2024 EPA rule requires water systems to notify customers if their water exceeds the new MCLs. For systems not yet in compliance, customers can reduce exposure by using certified water filters: NSF/ANSI 58-certified reverse osmosis systems remove approximately 90–99% of PFOA and PFOS; NSF/ANSI 53-certified activated carbon filters reduce PFAS at lower cost but with less consistent results. Check NSF International’s database (nsf.org) for certified products. Bottled water treated by reverse osmosis also avoids PFAS, but creates significant plastic waste.

If you work for a water utility or local government: The compliance timeline is real — monitoring by 2027, compliance by 2029. Water systems that exceed the MCLs must notify customers in 30 days and report to the state. The capital cost of treatment (typically granular activated carbon or high-pressure membrane systems) can run $1 million to $100 million+ depending on system size. The $10 billion federal infrastructure allocation provides some relief, but demand far exceeds available funding.

If you work in industry with PFAS emissions: The TRI reporting expansion (effective for PFAS releases from 2020 forward) means your facility’s PFAS releases to air, water, and land are publicly reported annually in the EPA TRI database. Additional TSCA reporting requirements, proposed CERCLA/Superfund designations for PFOA and PFOS (finalized in 2024), and state-level restrictions are all moving in the direction of more cost and disclosure, not less.

State Variations

State PFAS regulation varies dramatically — many states moved ahead of EPA years before the 2024 federal rule:

• Vermont and Massachusetts: Among the earliest state PFAS drinking-water standards; Vermont set a 20 ppt combined limit for six PFAS before EPA finalized its rule; Massachusetts similarly set enforceable MCLs for six PFAS (combined 20 ppt limit)
• Michigan: Set aggressive PFAS limits in 2020 — 8 ppt for PFOA, 16 ppt for PFOS, and individual MCLs for five other PFAS compounds; Michigan's standards influenced the EPA rulemaking
• California, Minnesota, New Jersey: All adopted PFAS drinking-water standards; California's 2023 PFAS regulations included 10 ppt for PFOA and 40 ppt for PFOS, while New Jersey's 2020 rules set 14 ppt for PFOA and 13 ppt for PFOS
• Biosolids and soil: Several states (Maine, Colorado, Michigan) have banned or restricted PFAS-contaminated biosolids (treated sewage sludge) from being applied to farmland — a pathway for PFAS to enter groundwater and crops not addressed by the federal drinking-water rule
• Consumer product restrictions: California's AB 1817 (effective 2025) and similar laws in multiple states restrict PFAS in textiles, food packaging, and cookware — reducing future PFAS loading into water systems
• States that relied entirely on the federal standard faced a compliance push after the April 2024 EPA rule; states with pre-existing standards often had water utilities already partially compliant

Implementing Guidance

• EPA remains the main public-facing regulator for drinking-water rules and PFAS release disclosure
• USGS remains a major source of national PFAS occurrence data and methodology work
• In practice, implementation also depends heavily on state environmental agencies, water systems, and infrastructure-grant programs

Pending Legislation (119th Congress)

PFAS remains an active legislative topic, but as of April 2026 no major standalone 119th Congress measure had displaced this chapter’s basic role in the federal PFAS drinking-water and disclosure framework.

Recent Developments

• EPA’s first nationwide PFAS drinking-water rule was finalized on April 10, 2024
• On May 14, 2025, EPA announced it would keep the drinking-water standards for PFOA and PFOS, while planning to reconsider the rulemaking path for PFHxS, PFNA, GenX, and the hazard-index mixture, and to extend the PFOA/PFOS compliance timeline
• EPA’s PFAS implementation materials remained active into 2026, including the new PFAS OUT support effort for water systems expected to begin outreach in summer 2026
• On February 23, 2026, EPA finalized a rule adding sodium PFHxS to the Toxics Release Inventory, continuing the expansion of PFAS release disclosure
• USGS’s PFAS work also remained active in 2025-2026, including national groundwater occurrence modeling and ongoing public-facing PFAS sampling and methodology resources