New York’s drinking water standards for PFAS and emerging contaminants
New York regulates several contaminants more strictly than the federal minimum, and was among the first states to set enforceable limits for PFOA, PFOS, and 1,4-dioxane. Here’s how the state and federal rules fit together.
The framework
State standards on top of federal rules
All U.S. public water systems must meet the EPA’s National Primary Drinking Water Regulations under the Safe Drinking Water Act. States may set their own standards as long as they are at least as strict as the federal ones. New York, through the NYS Department of Health, has done exactly that for several contaminants — adopting enforceable Maximum Contaminant Levels (MCLs) before, or stricter than, the corresponding federal action.
PFOA and PFOS
New York’s 10 ppt PFAS standards
In 2020, New York adopted enforceable MCLs of 10 parts per trillion (ppt) each for PFOA and PFOS — two of the most studied “forever chemicals.” These were among the first state PFAS drinking-water standards in the country. In 2024 the EPA finalized federal PFAS limits (4.0 ppt for PFOA and PFOS, with limits for several other PFAS); where federal and state limits differ, systems must meet whichever is stricter. See our PFAS explainer for the compound-by-compound detail.
1,4-Dioxane
The first state MCL for 1,4-dioxane
New York was the first state to set an enforceable drinking-water limit for 1,4-dioxane, at 1 ppb, a contaminant of particular concern on Long Island. See our Long Island 1,4-dioxane guide for how it’s treated.
Lead
Lead: federal action level plus New York school rules
For public water systems, the federal Lead and Copper Rule sets a 15 ppb action level measured at the tap in sampled homes. Separately, New York sets a stricter 5 ppb action level for individual outlets in schools under 10 NYCRR Subpart 67-4, and requires water systems to inventory their lead service lines. See lead and copper in home water and the NY school lead testing overview.
What it means
What this means for you
Practically, it means your water provider is held to some of the strictest drinking-water standards in the country, and its annual Consumer Confidence Report will show results against these limits. Standards evolve — always confirm the current MCL with the NYS Department of Health or EPA before relying on a specific number.
FAQ
Frequently asked questions
Does New York have stricter water standards than the federal government?
For several contaminants, yes. New York adopted first-in-the-nation enforceable limits for PFOA and PFOS (10 ppt each) and 1,4-dioxane (1 ppb), and sets a 5 ppb lead action level for school outlets. Where a federal limit is stricter, systems must meet the stricter number.
What is the PFAS limit in New York drinking water?
New York set MCLs of 10 ppt each for PFOA and PFOS in 2020. The EPA’s 2024 federal PFAS rule set 4.0 ppt for PFOA and PFOS plus limits for other PFAS; public water systems must meet whichever applicable limit is stricter.
Who enforces drinking water standards in New York?
The New York State Department of Health (NYSDOH) is the primary enforcement agency for public water systems in New York, implementing both federal Safe Drinking Water Act requirements and New York’s own stricter standards.
NY Water Quality Guide is an independent educational resource and is not affiliated with or endorsed by any government agency or utility. This page is general education, not legal, medical, or regulatory advice. Verify current standards and any health guidance with the NYS Department of Health and the EPA.
Last reviewed: July 2026