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.

February 4, 2026
If you feel aligned with our mission and would like to support our work through advocacy, there are many meaningful ways to get involved. You can attend local regulatory meetings, participate in and speak at Annual Town Meetings, serve as an informed environmental ambassador among friends and neighbors, rally support for articles that protect Nantucket’s natural resources, and oppose those that pose risks to their long-term health. You can also lend your voice by drafting or signing Letters to the Editor. If you’re interested in participating in our advocacy efforts as a Community Advocate, please click H ERE.
December 22, 2025
As the end of the Fall season approaches, we would like to take some time to reflect on Nantucket’s recent Special Town Meeting, held on November 4th. The Nantucket Land & Water Council has been engaged in Nantucket’s discussion about short-term rental (STR) policy and regulation for many years. As an organization, we have, at times, faced questions from residents about the relevance of STRs to the NLWC’s mission . The NLWC’s mission is to help preserve the long-term health of Nantucket’s environment and community through the protection of our land and water resources. Development impacts the environment. This simple fact should come as no surprise. Our actions on the land have a direct impact on the health of our waters. Nutrients like nitrogen and phosphorus from septic systems and fertilizers, along with other contaminants such as those found in stormwater runoff, don’t just disappear. They travel through the soil and into our ponds, harbors, and drinking water. The accelerated development, repurposing of properties, and intensity of use associated with short-term rentals (STRs) as a business put increasing pressure on the island’s infrastructure, reduce habitat and biodiversity, and endanger our water quality. Of course, a community needs to change and develop and grow, but the health of our environment and the ability of a place to naturally support the people who live there are directly related to the intensity and type of development and growth that we, as a community, choose to allow and encourage. The NLWC has always made it clear that we are not opposed to all short-term rentals. We support the ability of island residents to short-term rent with reasonable restrictions. We have, first and foremost, sought to reduce the impact from investor-owned STRs, and reduce the intensity of use and development from properties that are maximized solely for the use of short-term rentals because of the cumulative environmental impacts that this type of use and development creates. We were very disappointed by the November STM vote, which resulted in the full codification of short-term rentals across all residential zoning districts of the island. It is clear that much of the community was incredibly alarmed by the simple messaging provided by Article 1 proponents that asserted this was a matter of maintaining an important property right or losing that right. Alternatively, we, as proponents of Article 2, attempted to communicate a more nuanced message that memorializing this right with reasonable restrictions would actually allow most residents to continue short-term renting in a meaningful way while helping to protect the future of our environment and community. As the dust settles, and our media expresses the reality of the inadequacy of our existing regulations ( https://nantucketcurrent.com/news/nantucket-banned-corporate-owned-short-term-rentals-a-loophole-is-allowing-them-to-continue ) , there is clearly more that needs to be done. All of our policies and practices relative to growth, development, and land and resource management , including STR regulations, must be scrutinized for their impact on our shared natural resources and adjusted where needed to protect the health of our environment and community. It is easy to make the claim that STRs as an issue is not “in our lane” and to suggest that how we use and develop our properties are somehow separate from: PFAS issues, contamination of our public water supply, nutrient pollution, and water conservation , but these are the exact concerns that compel the NLWC to engage in community conversations about growth, development, land use, and STRs. We are the voice for Nantucket’s environment, working to safeguard the present health and future sustainability of the island. This is our lane. We thank all of our members and friends for your support , regardless of your position or vote at STM. We know that, despite differences in opinion, we all share a deep care for this special place and a desire to protect what makes it unique. Together, we can shape policies that reflect both the needs of our community and the limits of our fragile island environment. Your willingness to stay engaged—ask questions, share concerns, and offer ideas—continues to strengthen our efforts. There is more work to do, and we look forward to doing that work with you.
By Anna Day October 27, 2025
At the upcoming Special Town Meeting on November 4th, Nantucket voters will once again consider how best to regulate short-term rentals (STRs). After years of debate, two competing proposals, Articles 1 and 2, offer very different paths forward. The Nantucket Land & Water Council (NLWC) supports Article 2 , which encourages sustainable use of island resources and provides a balanced, long-term solution. Click Here to read the NLWC’s recommendations on the warrant articles. Click Here to read our Letter to the Editor. Join Us and Vote Environment First! Tuesday, November 4 at 5:00 pm in the Mary P. Walker Auditorium of the Nantucket High School.
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