PFAS in Colorado Tap Water What Homeowners Need to Know About Risks Testing and Protection

PFAS can feel unsettling because they are invisible. Tap water can look clear, taste normal, and still carry trace amounts of chemicals that deserve attention. The reassuring part is this: homeowners have more testing options, better filtration choices, and clearer public guidance than ever before.

PFAS, short for per- and polyfluoroalkyl substances, are a large group of human-made chemicals used for decades in products that resist heat, grease, oil, stains, and water. They are often called “forever chemicals” because many do not break down easily in the environment or the human body.

In Colorado, PFAS concerns are not theoretical. Communities along the Front Range and near certain military, airport, industrial, and firefighting training sites have dealt with PFAS contamination in groundwater and drinking water supplies. That does not mean every home has a problem. It does mean that knowing the risks, checking your water source, and choosing the right treatment can make a real difference.

PFAS cannot be seen, smelled, or tasted in tap water.

What PFAS are and why they matter in Colorado water

PFAS are not one chemical. They are a family of thousands of related compounds. Some of the best-known include PFOA, PFOS, PFNA, PFHxS, and GenX chemicals. These names show up often in water reports because regulators and laboratories can test for them more reliably than many other PFAS compounds.

These chemicals became popular because they do a specific job well. They help coatings repel water and oil. They help some firefighting foams spread across fuel fires. They have been used in certain nonstick cookware, stain-resistant fabrics, food packaging, waterproof clothing, industrial processes, and other products.

The same traits that make PFAS useful also make them persistent.

Once released, PFAS can move through soil into groundwater. They can travel in rivers and reservoirs. Some can build up in fish, wildlife, and people over time. This is why water utilities, health agencies, and homeowners pay close attention even when PFAS are measured in very small amounts.

In Colorado, water sources vary widely. Some homes rely on municipal water from reservoirs, rivers, or blended sources. Others use private wells. Mountain communities, plains communities, and Front Range neighborhoods can all have different risk profiles.

A home’s risk depends on several factors:

• The water source

• Nearby contamination sites

• The age and depth of a private well

• Local industrial or military activity

• Whether the water utility has tested and reported PFAS

• Whether treatment is already in place

  
  

The phrase PFAS in Colorado tap water can sound alarming, but the practical question is more specific: which PFAS, at what level, in which water source, and for how long?

Health risks linked to PFAS exposure

PFAS research is still developing, but health agencies have identified several areas of concern. Not every PFAS has the same level of evidence, and health risk depends on the amount, frequency, and length of exposure.

Research suggests some PFAS may be linked to:

• Changes in cholesterol levels

• Effects on the immune system

• Lower antibody response to some vaccines

• Changes in liver enzymes

• Increased risk of high blood pressure during pregnancy

• Lower birth weight

• Increased risk of certain cancers, including kidney and testicular cancer, for some compounds

  
  

This does not mean that a single glass of water will cause illness. PFAS risk is usually about long-term exposure. Drinking water matters because people use it every day for drinking, cooking, coffee, tea, baby formula, and pet water.

Children, pregnant people, nursing parents, and people with certain health concerns may want to be more cautious. Households that use private wells near known contamination areas may also want to test sooner rather than later.

This article is for general information only. For personal medical guidance, especially during pregnancy or when caring for infants, speak with a qualified health professional.

Where PFAS contamination comes from

PFAS can enter Colorado water from several sources. Some are local and clear. Others are diffuse and harder to trace.

Firefighting foam

One of the most important PFAS sources is aqueous film-forming foam, often called AFFF. This foam was widely used to fight fuel fires at military bases, airports, refineries, and training facilities. When foam is sprayed during training or emergency response, PFAS can seep into soil and groundwater.

Colorado communities near certain military and aviation facilities have paid close attention to this issue because firefighting foam has been tied to contamination in some areas.

Industrial activity

Some manufacturing, metal plating, chemical processing, and waste handling operations have used PFAS. Wastewater from these facilities can carry PFAS into treatment plants, rivers, or groundwater.

Standard wastewater treatment was not designed to fully remove PFAS. That means chemicals can pass through treatment systems unless special controls or treatment technologies are added.

Landfills and waste sites

PFAS in consumer products can end up in landfills. Over time, rainwater can move through buried waste and create leachate, a liquid that may contain PFAS and other contaminants. If leachate is not carefully managed, it can affect nearby water.

Consumer products in daily life

PFAS may be found in some stain-resistant carpets, water-resistant textiles, grease-resistant food packaging, older nonstick cookware, and certain personal care products. These products are not usually the main reason PFAS appears in tap water, but they can add to overall exposure.

Biosolids and runoff

Wastewater treatment plants produce biosolids, which may be used as fertilizer in some places. If those biosolids contain PFAS, the chemicals can move into soil, runoff, or groundwater. This is an active area of concern across the country.

PFAS can move through soil, groundwater, and runoff before reaching drinking water sources.

How to find out if PFAS may be in your tap water

The best first step is not buying a filter. It is finding out what water you have and whether anyone has already tested it.

Check your water utility report

If your home uses a public water system, start with the annual Consumer Confidence Report. Water utilities publish these reports to explain where water comes from and what testing found.

Look for:

• PFAS testing results

• Names such as PFOA, PFOS, PFNA, PFHxS, GenX, or HFPO-DA

• Results reported in parts per trillion, often shown as `ppt` or `ng/L`

• Notes about treatment projects or source water changes

• Any health advisory or regulatory language

  
  

Some utilities also post PFAS updates on their websites. If the report does not mention PFAS, call the utility and ask whether PFAS testing has been done and when results will be available.

Look at state and federal resources

Colorado health and environmental agencies have tracked PFAS in water, soil, fish, and affected communities. Federal agencies also maintain information on PFAS rules, health advisories, and drinking water standards.

Useful places to check include:

• Colorado Department of Public Health and Environment resources

• Your county or local public health department

• Your water provider’s website

• EPA drinking water information

• Public notices from nearby military installations, airports, or industrial sites

  
  

Rules for PFAS in drinking water have become stricter. EPA has set enforceable limits for several PFAS in public water systems, and utilities are working through monitoring and treatment requirements. Homeowners do not need to know every regulatory detail, but it helps to know that PFAS are now part of mainstream drinking water oversight.

Test your private well

Private wells are different. If a home uses a private well, the homeowner is usually responsible for testing. Public water reports do not cover private wells.

Testing is especially wise if the well is near:

• A military site

• An airport

• A firefighting training area

• A landfill

• An industrial facility

• A wastewater treatment discharge area

• A location where PFAS contamination has already been reported

  
  

Use a lab that is certified or experienced in PFAS drinking water testing. Ask whether the lab uses EPA Method 533 or EPA Method 537.1, both of which are commonly used for PFAS analysis in drinking water.

PFAS testing requires careful sampling because these chemicals can be present in everyday items. The lab should provide specific instructions. Follow them closely.

Common sampling precautions include:

• Do not use waterproof clothing or stain-resistant gloves while sampling

• Avoid food packaging near the sample area

• Do not use lotions, cosmetics, or sunscreen right before collecting the sample

• Use only the containers supplied by the lab

• Keep the sample sealed and return it as directed

  
  

A good lab report should list individual PFAS compounds and their measured levels. If results are hard to understand, ask the lab, local health department, or a water treatment professional to help interpret them.

Accurate PFAS testing starts with careful sample collection.

What test results mean

PFAS results are often reported in tiny units. Parts per trillion can be hard to picture. One part per trillion is like one drop in a very large volume of water. Even so, some PFAS have health-based limits at extremely low levels because they can persist and build up over time.

When reviewing results, focus on three questions.

Which PFAS were found

Not all PFAS carry the same guidance or limits. PFOA and PFOS are among the most studied. Other compounds, such as PFNA, PFHxS, and GenX chemicals, also have regulatory attention.

How high the levels are

Compare your results with current federal or state guidance. If your water comes from a public system, your utility should explain what it is doing if levels exceed a standard. If your water comes from a private well, local health officials or water treatment experts can help you decide on next steps.

Whether exposure is ongoing

A single test is useful, but it is a snapshot. PFAS levels can change if source water changes, contamination moves, or treatment is installed. Private well owners near known contamination may need periodic testing.

How homeowners can reduce PFAS exposure

The most effective response depends on the situation. A household with no detected PFAS may only need routine monitoring. A household with elevated PFAS may need certified treatment or a temporary water source.

Use the right drinking water filter

Not all filters remove PFAS. Pitchers and refrigerator filters vary widely. Look for products tested and certified by independent organizations for PFAS reduction.

The most common effective options are:

Treatment option	Where it is used	What to know
Activated carbon	Pitchers, faucet filters, under-sink filters, whole-house systems	Can reduce some PFAS, but performance depends on carbon type, contact time, and maintenance
Reverse osmosis	Usually under the sink	Often effective for many PFAS and other contaminants, but creates wastewater and may need a storage tank
Ion exchange	Point-of-use or whole-house systems	Can be effective, especially in tailored systems, but requires proper design and media replacement

For most homes, a point-of-use filter at the kitchen sink is the most practical place to start. That targets the water used for drinking and cooking without treating every gallon used for showers, laundry, or toilets.

When shopping, look for certification to standards that include PFAS reduction, such as NSF/ANSI 53 or NSF/ANSI 58, depending on the product type. Read the fine print. A filter certified for chlorine or taste is not the same as one certified for PFAS.

Maintain filters on schedule

A filter only works if water passes through fresh, effective media. Old cartridges can lose performance. Some systems may even release trapped contaminants if neglected.

Keep a simple maintenance plan:

• Mark cartridge replacement dates on a calendar

• Follow gallon ratings and time limits

• Replace filters sooner if flow slows sharply

• Use manufacturer-approved replacement cartridges

• Keep installation manuals and certification details

  
  

Use cold water for drinking and cooking

Use cold tap water for drinking, cooking, coffee, tea, and baby formula. Hot water can pick up metals and other substances from plumbing more easily. Heating water does not remove PFAS.

Boiling water also does not destroy PFAS under normal kitchen conditions. In some cases, boiling can concentrate contaminants because water evaporates while chemicals remain.

Choose bottled water only as a temporary step

Bottled water can help during a short-term advisory or while waiting for a treatment system. It is not always a perfect answer. Bottled water quality varies, costs add up, and plastic waste becomes an issue.

If using bottled water for PFAS concerns, choose brands that provide water quality information and PFAS testing details when possible.

Reduce non-water PFAS exposure

Tap water may be one part of overall exposure. Homeowners can also reduce PFAS from household products.

Helpful steps include:

• Limit stain-resistant treatments on carpets and furniture

• Choose PFAS-free cookware when replacing older nonstick pans

• Reduce use of grease-resistant takeout packaging when practical

• Check personal care product labels for ingredients with “fluoro” in the name

• Wet-mop and vacuum with a HEPA filter to reduce household dust

  
  

These changes do not need to happen all at once. Start with easy replacements as products wear out.

Certified point-of-use filters can reduce PFAS in water used for drinking and cooking.

When to call a professional

Some situations are simple. A certified pitcher or under-sink filter may be enough for modest PFAS reduction at one tap. Other situations call for help.

Consider speaking with a qualified water treatment professional if:

• A private well test shows PFAS above health-based guidance

• Several contaminants appear in the same water test

• The home needs treatment beyond one faucet

• The well also has high minerals, iron, manganese, or other water quality issues

• Previous filters failed or were not certified for PFAS

• The household includes infants, pregnant people, or medically sensitive residents

  
  

Ask direct questions before buying a system:

• Which PFAS compounds does this system reduce?

• Is the product certified by an independent organization?

• What influent and effluent levels can I expect?

• How often must filters or media be replaced?

• Will you test the treated water after installation?

• What happens to used filter media?

  
  

A reliable provider should be willing to explain the system in plain language and document its expected performance.

A calm plan for Colorado homeowners

PFAS can be serious, but the path forward is manageable. Start with information, then act based on evidence.

A practical plan looks like this:

1. Identify your water source

   
   

   Find out whether your home uses a public water system or a private well.

   
   

1. Review existing test data

   
   

   Read your water utility report or check local and state health resources.

   
   

2. Test if needed

   
   

   Private well owners and households near known contamination areas should consider certified PFAS testing.

   
   

1. Compare results with current guidance

   
   

   Look at which PFAS were found and at what levels.

   
   

2. Treat drinking and cooking water first

   
   

   Use a certified activated carbon, reverse osmosis, or ion exchange system when treatment is needed.

   
   

1. Maintain the system

   
   

   Replace filters on schedule and retest treated water when appropriate.

   
   

2. Reduce exposure from other products

   
   

   Make gradual changes in cookware, textiles, packaging, and dust control.

   
   

PFAS are a long-term water quality issue, not a reason to panic. Colorado homeowners have real tools: public reports, certified labs, proven filters, and growing regulatory oversight. The smartest next step is simple. Find out what is in the water, then choose protection that matches the results.