How to Remove PFAS (Forever Chemicals) from Your Drinking Water
PFAS are in your water and they don't go away on their own. Here's what they are, why they're dangerous, and which water filters actually remove them.
Updated March 2026 · 8 min read
PFAS Are Likely in Your Water Right Now
The EPA estimates that PFAS contamination affects over 100 million Americans. In California, PFAS have been detected in 70%+ of tested water systems. Standard water treatment and basic filters like Brita pitchers do not remove PFAS. Only reverse osmosis and specialized activated carbon systems are effective.
What Are PFAS?
PFAS (per- and polyfluoroalkyl substances) are a group of over 12,000 man-made chemicals that have been used since the 1950s. They're found in:
Firefighting foam (AFFF) — the #1 source of water contamination
Cosmetics, dental floss, and hundreds of consumer products
PFAS are called "forever chemicals" because they contain carbon-fluorine bonds — one of the strongest chemical bonds in nature. They don't break down in the environment, in water treatment, or in your body. When you ingest PFAS through contaminated water, they accumulate in your blood, organs, and tissues over your lifetime.
Why Are PFAS Dangerous?
Research has linked PFAS exposure to a growing list of serious health effects:
Cancer — kidney cancer, testicular cancer, and other cancers are associated with PFAS exposure. The EPA has classified certain PFAS as likely carcinogens.
Thyroid disease — PFAS interfere with thyroid hormone production, leading to hypothyroidism and metabolic disorders.
Immune system suppression — PFAS reduce vaccine effectiveness and weaken immune response. Studies showed people with higher PFAS levels had weaker COVID-19 vaccine responses.
Reproductive issues — reduced fertility, pregnancy complications, low birth weight, and developmental delays in children.
Liver damage — PFAS accumulate in the liver and can cause elevated liver enzymes and non-alcoholic fatty liver disease.
Cholesterol — PFAS exposure is linked to elevated cholesterol levels, increasing cardiovascular risk.
Hormone disruption — PFAS are endocrine disruptors that can affect estrogen, testosterone, and other hormones.
The half-life of PFAS in the human body ranges from 2 to 8+ years. This means even after you stop ingesting PFAS, it takes years for levels to decrease. Every glass of contaminated water adds to your cumulative lifetime burden.
PFAS in California Water
California has some of the highest PFAS contamination levels in the nation, primarily due to:
Military bases — Camp Pendleton, Edwards AFB, Travis AFB, March ARB, Moffett Field, and dozens of other military facilities used AFFF firefighting foam extensively. The foam soaked into groundwater over decades.
Commercial airports — firefighter training areas at LAX, SFO, SAN, and other airports are contamination sources.
Industrial sites — semiconductor manufacturing (Silicon Valley), chrome plating, and chemical manufacturing facilities released PFAS into water systems.
Landfills — consumer products containing PFAS break down in landfills, leaching into groundwater.
California has set notification levels of 5.1 parts per trillion (ppt) for PFOA and 6.5 ppt for PFOS — among the strictest in the country. The federal EPA set maximum contaminant levels of 4 ppt in 2024. Many California water systems exceed these levels.
Which Filters Actually Remove PFAS?
Not all water filters remove PFAS. Here's the honest breakdown:
Filter Type
PFAS Removal
Effectiveness
Reverse Osmosis
90-99%
Most effective home solution. Forces water through membrane that blocks PFAS molecules.
Activated Carbon Block (high quality)
60-90%
Effective with high-quality carbon. Look for NSF P473 certification. Effectiveness decreases as filter ages.
Ion Exchange Resin
80-95%
Effective but primarily used in whole-house systems. Higher cost.
Granular Activated Carbon
30-60%
Moderate effectiveness. Found in some pitcher and faucet filters. Not reliable for PFAS.
Standard Pitcher Filter (Brita)
0-20%
Not effective for PFAS. Some newer "Elite" models claim partial reduction but results are inconsistent.
Fridge Filter
0-10%
Not effective for PFAS removal.
Boiling Water
0%
Boiling actually concentrates PFAS. Never boil water to remove PFAS.
Important: Boiling water does NOT remove PFAS — it actually concentrates them by evaporating water while PFAS remain behind. Standard chlorine/chloramine treatment at water plants does NOT remove PFAS either. This is why home filtration is essential.
Recommended Systems for PFAS Removal
TOP RECOMMENDATION
Waterdrop G3P800 Tankless RO System
The most advanced home RO system available. 800 GPD tankless design with 7-stage filtration including UV sterilization. Smart TDS monitoring shows real-time water quality. NSF certified for PFAS removal. Removes 99.9% of contaminants.
Excellent PFAS removal at a more accessible price point. 400 GPD tankless design, smart monitoring, and NSF certified. Perfect for smaller households who want comprehensive PFAS protection.
Connects to your existing faucet — no plumbing needed. Great for renters or anyone who wants PFAS protection without a permanent installation. Same reverse osmosis technology in a portable package.
If you want to know your specific PFAS exposure, you have several options:
Check your water utility's report — look for your utility's Consumer Confidence Report. Some now include PFAS testing results. Also search the EWG Tap Water Database by zip code.
Home water test kit — companies like SimpleLab (Tap Score) and CyclopureDetect offer PFAS-specific home testing kits ($150-$350). You collect a water sample and mail it to their lab.
Request testing from your utility — you can contact your water provider and request PFAS testing data. California utilities are increasingly required to test and report.
Don't Wait for Test Results
Given that 70%+ of California water systems have detected PFAS, and that PFAS accumulate in your body over time, many health experts recommend installing an RO system proactively rather than waiting for test results. The cost of an RO system ($300-$700) is minimal compared to the potential health costs of ongoing PFAS exposure.
Frequently Asked Questions
PFAS (per- and polyfluoroalkyl substances) are over 12,000 synthetic chemicals used since the 1950s in non-stick cookware, food packaging, stain-resistant fabrics, and firefighting foam. They're called "forever chemicals" because they don't break down in the environment or in your body.
No. Standard Brita pitcher filters are not effective against PFAS. Even Brita's newer "Elite" filters show limited and inconsistent PFAS reduction. For reliable PFAS removal (90-99%), reverse osmosis is the recommended technology.
No — boiling actually concentrates PFAS by evaporating water while PFAS remain behind. Never rely on boiling to address PFAS contamination.
Check the EWG Tap Water Database (ewg.org/tapwater) by zip code, review your water utility's Consumer Confidence Report, or order a home PFAS test kit ($150-$350). Given that 70%+ of CA water systems have detected PFAS, most California residents are likely exposed.
Reverse osmosis is the most effective home solution, removing 90-99% of PFAS. Look for NSF P473 certification. We recommend Waterdrop RO systems for their combination of performance, design, and value.
Protect Your Family from Forever Chemicals
Remove PFAS from your drinking water with a reverse osmosis system.