575,000 New Yorkers get tap water that fails federal safety standards

At least 575,000 New York residents receive drinking water from systems that have exceeded federal limits for contaminants including arsenic, radium, and disinfection byproducts, according to state compliance data analyzed by New York Focus. The 27 water systems currently out of compliance serve communities across the state, with a pattern that environmental advocates say reflects longstanding inequities in water infrastructure investment.

The findings come as federal regulators face pressure to enforce drinking water standards more aggressively. Communities with elevated contamination levels have, in some cases, been out of compliance for years without resolution.

What the Compliance Data Shows

The water systems identified in the state data have exceeded EPA maximum contaminant levels for a range of substances. Arsenic, a naturally occurring element linked to increased cancer risk, appears in multiple systems. Radium, a radioactive element that can cause bone cancer with long-term exposure, also shows up in the data.

Disinfection byproducts, which form when chlorine used to treat water reacts with organic matter, round out the contamination picture. EPA regulates these byproducts because of potential risks of cancer and reproductive and developmental effects. It estimated its 2006 rule could prevent an average of 103 to 541 bladder cancer cases a year.

The affected systems range from small community water supplies serving a few hundred people to larger municipal systems. What they share is a failure to meet standards that the EPA considers the minimum threshold for safe drinking water.

Low-Income Communities and Communities of Color Bear the Contamination Burden

Environmental justice organizations have pointed to the demographic patterns in the data. Communities with lower median incomes and higher proportions of Black and Latino residents appear more frequently among the non-compliant systems.

This matches a national pattern documented by researchers. Water systems serving low-income communities often operate with smaller budgets, aging infrastructure, and less political leverage to secure state and federal funding for upgrades. The result is a two-tiered system where water quality depends partly on zip code.

For residents in affected areas, the contamination creates daily decisions about whether to trust what comes out of the tap. Some have turned to bottled water. Others have installed point-of-use filtration systems to reduce their exposure while waiting for system-wide solutions.

The Regulatory Response Gap

State health officials have issued compliance orders to the affected water systems, requiring them to submit plans for returning to safe levels. However, the timeline for actual remediation remains unclear in many cases.

Bringing a water system into compliance can require significant capital investment. For arsenic, treatment typically involves installing specialized filtration media. For radium, ion exchange or reverse osmosis systems may be necessary. For disinfection byproducts, utilities may need to modify their treatment processes or address organic matter in source water.

Smaller systems often lack the ratepayer base to fund these upgrades without external assistance. Federal infrastructure funding exists, but the application process is competitive and time-consuming. Some systems have been in violation for multiple years while navigating the funding landscape.

Natural Sources and Treatment Failures Behind the Violations

The contamination sources vary by system. Arsenic and radium typically enter water from natural geological formations, meaning the source water itself carries the contaminants. Disinfection byproducts, by contrast, are created during the treatment process intended to make water safe.

In both cases, the issue is not that contamination exists but that treatment systems have failed to remove it adequately. Water treatment technology capable of addressing these contaminants has existed for decades. The barrier is cost and institutional capacity.

New York's situation reflects a broader national challenge. A 2024 analysis found that 66 million Americans drink tap water from systems that have violated federal safety standards at some point. Private well owners, who are not covered by federal drinking water regulations, face even less visibility into their water quality.

What This Means for You

If you're in an affected area:

• Request your water system's most recent Consumer Confidence Report, which must be issued annually and lists any violations
• Consider independent water testing to verify contamination levels at your tap, as system-wide averages may not reflect conditions in your home
• For arsenic and radium, reverse osmosis systems certified to NSF/ANSI 58 can reduce levels significantly at the point of use

For general preparedness:

• Check your state's drinking water compliance database to see if your system has any current or recent violations

Filtration Options for Arsenic, Radium, and Disinfection Byproducts

The contaminants identified in New York's non-compliant systems require different treatment approaches. Arsenic binds effectively to specialized filtration media, while radium responds to ion exchange or reverse osmosis. Disinfection byproducts can be reduced with activated carbon filtration, though eliminating them entirely requires addressing the source water or treatment process.

For household protection, reverse osmosis systems offer the broadest coverage. These systems force water through a semipermeable membrane that blocks most dissolved contaminants, including heavy metals and radioactive particles. Our review of the best reverse osmosis systems for home use covers options across price points and installation types.

For those focused specifically on disinfection byproducts or seeking a lower-cost option, activated carbon filters certified to NSF/ANSI 53 can reduce trihalomethanes and haloacetic acids. Whole-house systems provide protection at every tap, while under-sink units offer targeted filtration for drinking water. Our guide to under-sink water filters includes models certified for disinfection byproduct reduction.