NLWC News


Protecting Your Tap: Choosing the Right PFAS Water Filter for Your Home

Anna Day • July 30, 2025

If you're concerned about PFAS (per- and polyfluoroalkyl substances) in your drinking water, filtering your water is an easy step you can take to reduce exposure. There are effective filtration options that can significantly reduce PFAS levels in your tap water.


Below, we've outlined a few types of filters that are known to reduce PFAS, along with the certification to look out for, to help you choose the right one for your needs and budget.

What to Look for: NSF Certification

When selecting a filter, the Nantucket Land & Water Council recommends using water treatment devices that are NSF certified. NSF International certification provides independent, third-party verification that a filter’s reduction claims have been validated.


Look for NSF/ANSI Standard 53 when searching for all drinking water filters and NSF/ANSI Standard 58 for reverse osmosis systems. These standards ensure that certified filters effectively reduce PFAS to below 20 parts per trillion.


NSF-certified filters are available in many formats, including pitchers, under-sink units, and reverse osmosis systems. You can find a searchable list of certified products on the NSF International website.

Pitcher and Countertop Filters

Best for: Renters or those looking for a low-cost, easy-to-use solution.

Pitcher-style and countertop filters are convenient first lines of defense. Many use activated carbon or ion exchange technology to reduce PFAS and other common contaminants like chlorine and lead. While these options may not be as thorough as more complex systems, several models have been tested and certified to reduce PFAS to safe levels.


The Environmental Working Group (EWG) has reviewed and recommended a number of effective pitcher and countertop options. You can explore their top picks here.

Undersink and Reverse Osmosis Systems

Best for: Households looking for a more comprehensive, long-term solution.

Reverse osmosis (RO) systems are among the most effective tools for removing PFAS from drinking water. These systems often include several stages of filtration, starting with sediment and activated carbon filters to remove chlorine, VOCs, and other impurities. Then, water passes through a semipermeable membrane that screens out tiny particles, including PFAS, heavy metals like arsenic, and other hard-to-remove contaminants.


When it comes to RO systems to reduce PFAS, the NLWC recommends at least a 5-stage NSF-certified filtration system. Many different systems can be found online and easily installed. It is important to remember to regularly change the filters of whichever RO system you choose regularly and to dispose of used filters properly per manufacturer guidelines.

Bottom Line

By investing in a certified filter that fits your home and budget, you can take meaningful steps to protect your household from these persistent chemicals. As always, if you have any immediate concerns about your water quality, we recommend obtaining a testing kit from the Health Department at 131 Pleasant Street.

By Anna Day October 2, 2025
Last week, the appeal hearing for the Surfside Crossing 40B development was conducted remotely by the state’s Housing Appeals Committee (HAC). The NLWC participated as an intervening party to defend clean drinking water for Nantucket. The proposed 156 condo unit development on 13.6 acres known as Surfside Crossing (SSX) off of South Shore Rd is of inappropriate density (13 x the local zoning) and would compromise our drinking water supply. Following the comprehensive permit review by the Zoning Board of Appeals (ZBA) that took place throughout last fall and winter, the application for SSX was unanimously denied by the ZBA. This denial was subsequently appealed to the state by the developers, Jamie Feeley and Josh Posner, in April of this year. During the comprehensive permit review last year by the ZBA, the NLWC hired an engineering expert and water quality specialist to review the project’s stormwater management plans. The review and testimony of these experts revealed that the stormwater infrastructure proposed for the Surfside Crossing development does not meet the specific state and local standards for projects within the Nantucket Wellhead Protection District (the area where groundwater contributes to the public water supply wells), or for projects that meet the state’s criteria as a Land Use of Higher Potential Pollutant Load (LUHPPL). Given recent public well contamination by elevated PFAS levels, it has become abundantly clear that these standards are incredibly important to uphold, especially for a project of this scale within our public water supply recharge area. The local ZBA agreed with the importance of protecting clean water , and asked the developers to address the stormwater management design to ensure that it meets state and local standards and protects not only the residents and direct abutters of the development, but the public water supply that we all share. Unfortunately, the developers refused to make any changes to their proposed design, in part because it would require a reduction in the number of units to make the necessary changes, and in part because they have already installed their stormwater infrastructure, “at risk”, without the benefit of a permit, and without a water quality certificate issued by the Water Commission as required in Nantucket’s Zoning Bylaw. They simply do not want to have to take it back out of the ground. Based on concerns for the health of the community’s drinking water, as well as other concerns relative to public safety and traffic, and considering the developers’ refusal to consider any changes whatsoever to their proposal, the ZBA unanimously denied the project. As an intervening party in the developers’ appeal of the ZBA’s decision, he NLWC has been working closely with the counsel for the Town of Nantucket’s ZBA, and the residents group, Tipping Point, to file written testimony from the NLWC’s engineer, the ZBA’s engineer, and several water quality and PFAS subject matter experts. During the HAC hearing last week, the developers’ counsel chose not to cross-examine any of these witnesses, and so their written testimony stands unchallenged, leaving the hearing office no basis to question their expert opinions. This hearing on the Surfside Crossing matter follows a similar appeal by developers in the Town of Walpole for a Chapter 40B development that was also denied by the Town’s ZBA due to similar concerns over improperly designed stormwater infrastructure, and the degradation of the Town of Walpole’s public water supply. As we await a decision from the HAC, we are grateful to Nantucket’s ZBA for their due diligence during the public hearing process, and for the opportunity to prepare for the appeal hearing in partnership with Town Counsel for the ZBA, as well as the residents’ group Tipping Point.  Stay Tuned for Updates!
By Anna Day July 31, 2025
In April 2025, the Nantucket Land & Water Council (NLWC) joined over a dozen Nantucket residents —including members of the Nantucket Coastal Conservancy, property owners in Quidnet, and the Greenhill family—in filing a Request for a Superseding Order of Conditions (SOC) with the Massachusetts Department of Environmental Protection (MassDEP). This action was taken in response to the positive Order of Conditions issued by the Nantucket Conservation Commission on March 20, 2025, which approved a three fold expansion of the ’Sconset Bluff Geotube project.
By Anna Day April 25, 2025
We Invite You to Join Us!
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