PFAS in Waterways: What It Means for Home Water Filtration

PFAS are back in the news, and this time the concern is California waterways. A recent SFGATE article reported that an Environmental Working Group analysis found PFAS pesticides in surface water and sediment samples across multiple California counties, especially near agricultural areas.

For homeowners, this is another reminder that water quality does not begin at the kitchen faucet. What happens in rivers, reservoirs, groundwater, farms, storm runoff, and public water systems can eventually become part of the larger drinking-water conversation.

That does not mean every home has the same level of risk. It does mean PFAS are worth taking seriously, especially if you are trying to choose a home water purifier system, whole-home filtration system, or drinking-water filter for your family.

What the California PFAS report found

According to the SFGATE report, the Environmental Working Group reviewed California Surface Water Database records from 2020 to 2024 and found PFAS in waterways across 10 counties, including agricultural areas in Butte, Colusa, Imperial, Merced, Monterey, San Luis Obispo, Santa Barbara, Stanislaus, Sutter, and Yolo counties.

The report noted that PFAS were detected in as much as 50% of the surface water samples reviewed, and that PFAS were also found in sediment samples. Some counties had multiple PFAS pesticides detected, while others had fewer detections.

The study did not include every California county or every PFAS pesticide currently in use, so the findings do not tell the whole story. Still, they add to a growing concern: PFAS can move through the environment in ways that are hard to see, track, and clean up.

What are PFAS?

PFAS stands for per- and polyfluoroalkyl substances. These are human-made chemicals that have been used for decades in products designed to resist water, grease, oil, heat, and stains.

You may hear PFAS called "forever chemicals" because many of them do not break down easily. Once they enter water, soil, sediment, wildlife, or the human body, they can remain for a long time.

PFAS have been associated with industrial activity, firefighting foam, wastewater discharge, landfills, consumer products, food packaging, and some pesticide uses. That is why PFAS pollution is not only one industry's problem. It is a broad water-quality issue.

How PFAS can reach drinking-water sources

PFAS can enter the environment through several pathways. In agricultural areas, PFAS may be tied to certain pesticide uses, runoff, irrigation patterns, and sediment movement. In other areas, PFAS may be linked to manufacturing, airports, military sites, landfills, wastewater systems, or firefighting foam.

Once PFAS reach surface water or groundwater, they can become part of the source-water picture for public systems, private wells, and local waterways.

Why homeowners should pay attention

PFAS are not like rusty water, sulfur odor, or visible sediment. You usually cannot see, smell, or taste them. Water can look clear and still contain contaminants that only testing can identify.

The U.S. Geological Survey estimated in 2023 that at least 45% of U.S. tap water could contain one or more PFAS. That estimate included both public water systems and private wells, which is important because private well owners are responsible for testing and treatment decisions on their own property.

EPA also finalized national drinking-water standards for several PFAS in 2024. Those standards include enforceable limits for PFOA and PFOS at 4 parts per trillion, along with limits for several other PFAS compounds. Public systems have monitoring and compliance timelines, but that does not instantly answer every household's water question.

Can a home water purifier system reduce PFAS?

Yes, certain home water purifier systems can help reduce PFAS when they are properly designed, sized, installed, and maintained. The key is choosing a system based on the actual water concern, not just the word "filter" on a product label.

Common PFAS treatment options include activated carbon, catalytic carbon, reverse osmosis, and certain specialty media. The best fit depends on your water source, the PFAS present, household size, flow needs, and whether you want drinking-water treatment only or broader whole-home coverage.

For some homes, a dedicated reverse osmosis drinking-water system may make sense. For others, a whole-home water filtration system may be the better starting point. Some households choose both: whole-home filtration for broader water quality and reverse osmosis for dedicated drinking water.

Whole-home filtration vs. drinking-water filtration for PFAS

A point-of-use system treats water at one location, usually a kitchen faucet. This can be a strong option if your main concern is drinking water, cooking water, coffee, tea, and ice.

A whole-home filtration system treats water as it enters the house. This can support water used at sinks, showers, laundry, appliances, and other water-using areas throughout the home.

The right choice depends on what you want to improve. If your primary concern is PFAS in drinking water, reverse osmosis may be part of the answer. If you are also concerned about chlorine, chloramine, VOCs, sediment, scale, taste, odor, or broader household water quality, a whole-home system may be a better fit.

Testing is still the best first step

PFAS risk can vary by location, water source, nearby land use, and local water system conditions. That is why testing matters. A water report or news story can raise awareness, but it cannot tell you exactly what is coming from your tap.

If you use city water, review your local water-quality report and any PFAS testing notices from your utility. If you use a private well, testing is even more important because private wells are not monitored the same way public water systems are.

What homeowners can do now

You do not have to solve the entire PFAS problem to take practical steps at home. Start by learning your water source, checking available water-quality reports, and testing when needed.

How Freedom Water Systems can help

Freedom Water Systems offers home water filtration solutions designed to help address PFAS concerns along with other common water-quality issues, depending on the system and source water.

Many homes are not dealing with only one concern. City-water households may also be thinking about chlorine, chloramine, VOCs, taste, odor, and scale. Well-water households may need to consider sediment, iron, sulfur, hardness, bacteria, arsenic, nitrates, or other location-specific issues.

If you are not sure where to begin, start with testing and a clear look at your treatment goals. You can review our performance data, explore our whole-home water filter systems, or schedule a free consultation.

PFAS are invisible, but your options are not

The latest PFAS findings in California waterways are part of a bigger national conversation about forever chemicals, water sources, and household exposure. While no single home filtration system can fix environmental contamination at the source, the right system can help reduce exposure at home.

For homeowners, the best path is simple: pay attention to local water news, test when needed, and choose a water filtration system based on your actual water source and concerns.

Frequently Asked Questions

What are PFAS in water?

PFAS are human-made chemicals often called forever chemicals because many do not break down easily. They can enter water through industrial activity, firefighting foam, wastewater, landfills, consumer products, and some pesticide uses.

Can PFAS get into drinking water?

Yes. PFAS can move into surface water, groundwater, public water systems, and private wells depending on nearby sources, runoff, land use, and local water conditions.

Can I see, smell, or taste PFAS in water?

No. PFAS are usually not detectable by sight, smell, or taste. Testing is the only way to know whether they are present in your water.

Can a home water purifier system reduce PFAS?

Certain home water purifier systems can help reduce PFAS when they are designed for that purpose and properly installed and maintained. Common options include activated carbon, catalytic carbon, reverse osmosis, and specialty media.

Is whole-home filtration or reverse osmosis better for PFAS?

Reverse osmosis can be a strong choice for dedicated drinking-water treatment. Whole-home filtration supports broader water quality throughout the house. Some homeowners choose both.

What is the best first step if I am worried about PFAS?

Start by checking local water reports and testing your water if needed. Then compare filtration options based on your water source, PFAS concerns, and whether you want drinking-water or whole-home treatment.

Sources

• SFGATE: Forever chemicals found in California waterways in 10 counties
• U.S. Environmental Protection Agency: PFAS National Primary Drinking Water Regulation
• U.S. Geological Survey: Tap water study detects PFAS across the U.S.

Updated for accuracy and relevance.