PFAS in Municipal Water: What Treatment Plants Can and Cannot Remove

If your drinking water comes from a municipal system, there is a good chance it has been tested for PFAS at some point in the last few years. The EPA now requires public water systems to monitor for six PFAS compounds, and the results have not been reassuring. Thousands of water utilities across the country have reported detectable levels of forever chemicals. The harder question is whether your treatment plant can actually do anything about it.

For more on protecting your drinking water, see our guide to PFAS water testing and reverse osmosis for PFAS removal.

The Problem With Conventional Water Treatment

Standard municipal treatment was designed to handle bacteria, sediment, and common chemical contaminants. The typical process includes coagulation, sedimentation, sand filtration, and chlorine disinfection. None of these steps were built to capture PFAS molecules, which are extremely small, water-soluble, and chemically stable.

Research published in Environmental Health journals has confirmed that conventional coagulation and filtration show poor results against PFAS, particularly shorter-chain compounds like GenX. A treatment plant running a standard process passes most PFAS through to your tap unchanged.

Which Treatment Methods Actually Remove PFAS

Three advanced treatment technologies have shown real effectiveness against PFAS in municipal settings:

• Ion exchange resins are the top performers. Specialized PFAS-targeted resins can achieve removal rates above 99% for the most common compounds. Several utilities have started installing these systems, though they require regular resin replacement.
• Granular activated carbon (GAC) can remove up to 90% of certain PFAS types when the filters are fresh. The catch is that GAC saturates over time, and performance drops as the carbon fills up. Without frequent monitoring and replacement, breakthrough can happen quietly.
• Reverse osmosis removes over 90% of PFAS at the municipal level, but the energy costs and water waste make it expensive to scale for an entire city.

The most successful municipal programs combine multiple technologies. Facilities pairing ion exchange with existing filtration have reported average removal rates near 98%, while plants relying on GAC alone have struggled with rapid saturation.

How to Know If Your Water Is Affected

Your water utility is required to publish annual Consumer Confidence Reports, and many now include PFAS testing data. You can also check the EPA’s PFAS monitoring results or request a copy directly from your utility. Keep in mind that testing is still catching up, and not all PFAS compounds are covered by current requirements.

If you want to know exactly what is in your water, independent lab testing gives you the clearest picture. The SimpleLab Tap Score Professional PFAS Water Test covers PFAS along with dozens of other contaminants and provides a detailed report specific to your tap.

What You Can Do at Home

Even if your utility is upgrading its treatment, point-of-use filtration gives you direct control over what your family drinks. The most practical home solutions include:

• Under-sink reverse osmosis systems, which remove 90-99% of PFAS from your drinking and cooking water
• Certified activated carbon filters rated specifically for PFAS reduction (not all carbon filters qualify)
• Water pitcher filters with NSF/ANSI 53 or P473 certification for PFAS

A solid starting point is the Culligan ZeroWater 10-Cup Pitcher Water Filter, which uses a five-stage ion exchange filter and is one of the few pitchers that reduces PFAS to non-detectable levels in independent testing.

Beyond filtration, these steps help reduce your overall PFAS exposure:

• Test your water before choosing a filter so you know exactly which contaminants you are dealing with
• Replace filters on schedule since saturated filters stop working and can even release trapped contaminants
• Store drinking water in glass or stainless steel to avoid picking up additional chemicals from plastic containers
• Stay informed about your utility’s treatment upgrades and any new PFAS detections in your area

For a broader reduction strategy, check out our guide to top PFAS-free water filters and the comprehensive PFAS Free Life Database.

Frequently Asked Questions

Does my city water treatment plant remove PFAS?

Most conventional water treatment plants do not effectively remove PFAS. Standard processes like coagulation, sedimentation, and chlorine disinfection were not designed for these chemicals. Some utilities have begun adding advanced treatment such as granular activated carbon or ion exchange resins, but many have not. Check your utility’s Consumer Confidence Report or contact them directly to find out if they treat for PFAS.

What is the most effective way to remove PFAS from drinking water?

At the municipal level, ion exchange resins have achieved the highest removal rates, exceeding 99% for targeted PFAS compounds. For home use, reverse osmosis systems and certified activated carbon filters are the most effective options. Look for filters with NSF/ANSI P473 certification, which specifically tests for PFAS reduction.

Should I filter my tap water even if my city says it is safe?

It depends on your risk tolerance and your household. Municipal testing may not cover all PFAS compounds, and treatment plant performance can vary day to day. A point-of-use filter rated for PFAS gives you an extra layer of protection, particularly if you have young children or are pregnant. Independent water testing can help you make an informed decision.

*Research reference: Environmental Health 2021

Water and Wastewater 2026*