You turn on the tap, fill a glass, and take a drink. The water is clear, cold, and tastes fine. So it must be safe, right?

Not necessarily.

U.S. tap water often meets legal standards yet still contains low levels of heavy metals, disinfection byproducts, PFAS, microplastics, and other contaminants that can accumulate over a lifetime of exposure. Even "good-tasting" or filtered water may not fully address all of these categories.

The good news? You have the power to understand exactly what's in your local water supply—and take meaningful steps to protect your family's health.

Key Points:

• U.S. tap water can be legally compliant yet still contain concerning levels of heavy metals, PFAS, disinfection byproducts, and microplastics that accumulate over time.
• EWG's Tap Water Database provides free access to local water quality data showing contaminants that exceed health guidelines
• "Legal limits" balance feasibility and cost, while "health guidelines" focus purely on protecting human health—often at much lower levels
• Heavy metals like lead, arsenic, and mercury are particularly concerning because the body struggles to eliminate them naturally
• Advanced TRS uses nano-sized clinoptilolite zeolite to safely bind and remove heavy metals at the cellular level

How to Pull Your Own EWG Tap Water Report

The Environmental Working Group (EWG) has created one of the most comprehensive and user-friendly resources for understanding your local water quality: the EWG Tap Water Database.

Here's how to access your report in just a few minutes:

Step 1: Go to ewg.org/tapwater and enter your home ZIP code to find your local water utility.

Step 2: Select your specific utility and service area from the list. (If you're not sure which utility serves your home, check a recent water bill.)

Step 3: Review your utility's page, which shows:

• Detected contaminants with test dates and levels
• EWG's health guideline for each contaminant
• The legal limit (when one exists)
• How your water compares to state and national averages

Step 4: Click into individual contaminants (like arsenic, nitrate, or PFAS) to see source information and associated health risks.

Important Context: EWG's health guidelines are health-protective targets that don't consider cost or feasibility, unlike legal limits. This means your water can be legally compliant while still exceeding levels that health scientists consider ideal for long-term exposure.

Understanding "Legal Limit" vs. "Health-Based Guideline"

This distinction is crucial for understanding your water quality report.

EPA's Legal Standards (Enforceable)

MCL (Maximum Contaminant Level) is the highest level of a contaminant allowed in drinking water. It's set as close to the health goal as "feasible," considering treatment technology and cost. This is enforceable by law.

MCLG (Maximum Contaminant Level Goal) is the health goal—the level below which there's no known or expected health risk, with a margin of safety. This is not enforceable.

Why This Gap Matters

In plain terms: "Legal" doesn't always equal "optimal for health."

Legal limits balance health protection with what's technically and economically feasible for water utilities to achieve. Health-based guidelines focus purely on protecting human health, especially for vulnerable populations like children and pregnant women.

Example: The EPA's Lead and Copper Rule uses an "action level" of 15 parts per billion (ppb) for lead, which triggers treatment requirements. However, the EPA explicitly notes that this action level is not a "safe level" for lead in a home¹. The health-based goal (MCLG) for lead is actually zero, because no amount of lead exposure is considered safe, particularly for developing children.

The Most Common Contaminants in U.S. Tap Water

Across many U.S. water systems, similar contaminant "families" appear repeatedly, even when water is technically compliant with federal law.

Heavy Metals: The Silent Accumulators

Heavy metals are particularly concerning because your body has limited ability to eliminate them naturally. Once absorbed, they can accumulate in tissues and organs, potentially causing harm over years or decades of exposure.

Lead: Typically enters water from old pipes, solder, and plumbing fixtures rather than the source water itself. Lead exposure is linked to neurodevelopmental issues in children, cardiovascular problems in adults, and kidney damage². Even low-level chronic exposure can impact cognitive function and behavior.

Arsenic: Often occurs naturally in groundwater but can also come from industrial pollution and agricultural runoff. Long-term exposure to arsenic is associated with increased cancer risk, cardiovascular disease, and diabetes³.

Copper: Usually leaches from copper pipes and fixtures, especially in acidic water. While copper is an essential nutrient in small amounts, excessive exposure can cause gastrointestinal distress and liver damage.

Manganese: Naturally occurring in many water sources, manganese at elevated levels has been linked to neurological effects, particularly in children⁴.

Mercury: Can enter water supplies from industrial discharge, mining operations, and natural deposits. Mercury exposure affects the nervous system, kidneys, and immune system, with developing fetuses and young children being most vulnerable.

Disinfection Byproducts (DBPs)

When chlorine or chloramine (used to kill bacteria) reacts with naturally occurring organic matter in source water, it creates disinfection byproducts.

Trihalomethanes (THMs) and Haloacetic Acids (HAA5) are found in tens of millions of Americans' tap water samples. Long-term exposure to elevated DBPs has been associated with increased bladder cancer risk and possible reproductive effects⁵.

The challenge: Water utilities must balance microbial safety (which requires disinfection) with minimizing DBP formation—a difficult trade-off.

PFAS: "Forever Chemicals"

Per- and polyfluoroalkyl substances (PFAS) are synthetic chemicals used in nonstick cookware, water-resistant fabrics, and firefighting foam. A USGS study estimated that at least 45% of U.S. tap water contains one or more PFAS compounds⁶.

PFAS are called "forever chemicals" because they don't break down in the environment or the human body. Exposure has been associated with immune suppression, altered cholesterol levels, developmental effects, and increased risk of certain cancers⁷.

In April 2024, the EPA finalized the first-ever national drinking water standards for six PFAS compounds, setting limits as low as 4 parts per trillion for some—but thousands of PFAS compounds exist, and most aren't routinely tested for.

Nitrate and Nitrite

Common in agricultural regions where fertilizer and animal waste run off into source water. These compounds can form N-nitroso compounds in the body and are linked to colorectal cancer risk and thyroid disease at higher long-term levels⁸.

Microplastics

Multiple surveys find microplastics in both tap and bottled water, with particles also detected in human blood, stool, and lung tissue. While research is still emerging, early studies suggest potential impacts on metabolism, inflammation, and immune function⁹.

Everyday Exposure Pathways People Overlook

Most people think about drinking water, but water exposure happens in ways you might not consider:

Showering and Bathing: Some disinfection byproducts like THMs can volatilize into steam, creating inhalation exposure during hot showers. You can actually absorb more of certain contaminants through a 10-minute shower than by drinking two liters of the same water.

Cooking Water: When you boil water for pasta, rice, or vegetables, volatile chemicals may evaporate, but non-volatile contaminants like lead or PFAS actually concentrate as water volume decreases.

Ice Makers and Refrigerator Lines: These use the same source water and may have long contact time with tubing and lines, potentially increasing contaminant levels.

Baby Formula: Mixing formula with tap water can increase relative exposure for infants because their intake per body weight is much higher than adults.

Humidifiers: Using tap water in humidifiers can aerosolize dissolved contaminants, particularly minerals and potentially other compounds.

Why Heavy Metals Are Especially Concerning

Of all the contaminants we've discussed, heavy metals deserve special attention because of how they behave in the human body.

Unlike many other toxins that your body can metabolize and eliminate, heavy metals are particularly difficult to remove. They can:

• Accumulate in tissues over time, building up in bones, organs, and the brain
• Interfere with essential minerals, displacing calcium, zinc, and iron from their normal binding sites
• Generate oxidative stress, damaging cells and DNA
• Disrupt enzyme function, affecting thousands of biochemical processes
• Cross the blood-brain barrier, potentially affecting cognitive function and neurological health

Research shows that even low-level chronic exposure to heavy metals can have cumulative effects over a lifetime, particularly impacting children's developing brains and nervous systems¹⁰.

What You Can Do About Your Water at Home

While no single solution addresses every contaminant, several home water treatment options can significantly reduce exposure:

Reverse Osmosis (RO) Systems are among the most effective for removing heavy metals (lead, arsenic, mercury), many PFAS compounds, nitrates, and some disinfection byproducts. They require regular maintenance and do remove beneficial minerals along with contaminants.

Carbon Filtration (pitcher filters, under-sink systems) effectively removes chlorine, many disinfection byproducts, and improves taste, but is less effective for heavy metals unless specifically certified for them (look for NSF/ANSI 53 certification).

Choosing the Right System: Check your EWG report to identify which contaminants are present, then look for NSF-certified systems that specifically address those contaminants.

The Reality: Even the best filtration has limitations, and we're exposed to water in ways that bypass filters—showering, swimming, food prepared outside the home. This is why supporting your body's ability to eliminate accumulated heavy metals with Advanced TRS remains an important complement to water filtration.

 

How Advanced TRS Supports Heavy Metal Removal

Your body works hard to neutralize and eliminate toxins, but heavy metals like lead, mercury, and arsenic are especially stubborn. As they accumulate over time, they can actually diminish your body's natural ability to detoxify, creating a cycle that's difficult to break.

This is where Advanced TRS can make a meaningful difference.

The Science of Clinoptilolite Zeolite

Advanced TRS uses nano-sized clinoptilolite zeolite—a naturally occurring mineral with a unique cage-like structure that acts as a molecular sieve. The zeolite's negatively charged framework attracts and traps positively charged heavy metal ions, binding them safely for elimination from the body.

What makes Advanced TRS special:

Nano-Sized for Maximum Access: Coseva’s proprietary processing technology creates clinoptilolite zeolite particles that are small enough to travel throughout the body and reach the cellular level where heavy metals accumulate.

Lab-Created Purity: Unlike mined zeolites that can contain the very contaminants you're trying to remove, our clinoptilolite is created under ultra-controlled conditions in Salt Lake City, ensuring 100% purity.

Water-Encapsulated Delivery: Each particle is encapsulated in a protective water layer, enabling it to travel efficiently through the body and perform its detoxifying work at the cellular level.

Gentle and Safe: Advanced TRS works gradually and gently, allowing your body to eliminate heavy metals at a pace it can handle comfortably.

Supporting Your Body's Natural Detoxification

Advanced TRS doesn't replace your body's natural detoxification systems—it supports them. By safely binding and removing heavy metals that your body struggles to eliminate on its own, Advanced TRS helps restore your natural detoxification capacity.

This is particularly important for families with children, as reducing heavy metal burden during developmental years can support optimal cognitive function, behavior, and long-term health.

Your Family Deserves Clean Water and Clean Cells

You work hard to make healthy choices for your family. You deserve to know what's really in your water—and to have effective tools for protecting your family from the contaminants that slip through.

Advanced TRS represents our commitment to helping families safely remove the heavy metals and toxins that accumulate from everyday exposure, including the water we drink, cook with, and bathe in every day.

Because clean water matters. And so does what happens to the contaminants that inevitably make their way into our bodies.

LEARN MORE ABOUT ADVANCED TRS →

With care for your family's health and safety,

The Coseva Team

This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease.

References

1. U.S. Environmental Protection Agency. (2024). Basic information about lead in drinking water. EPA.gov.
   
   
2. Lanphear, B. P., et al. (2005). Low-level environmental lead exposure and children's intellectual function: An international pooled analysis. Environmental Health Perspectives, 113(7), 894-899.
   
   
3. Naujokas, M. F., et al. (2013). The broad scope of health effects from chronic arsenic exposure: Update on a worldwide public health problem. Environmental Health Perspectives, 121(3), 295-302.
   
   
4. Bouchard, M. F., et al. (2011). Intellectual impairment in school-age children exposed to manganese from drinking water. Environmental Health Perspectives, 119(1), 138-143.
   
   
5. Villanueva, C. M., et al. (2015). Disinfection byproducts and bladder cancer: A pooled analysis. Epidemiology, 15(3), 357-367.
   
   
6. Smalling, K. L., et al. (2023). Per- and polyfluoroalkyl substances (PFAS) in United States tapwater: Comparison of underserved private-well and public-supply exposures and associated health implications. Environment International, 178, 108033.
   
   
7. Fenton, S. E., et al. (2021). Per- and polyfluoroalkyl substance toxicity and human health review: Current state of knowledge and strategies for informing future research. Environmental Toxicology and Chemistry, 40(3), 606-630.
   
   
8. Ward, M. H., et al. (2018). Drinking water nitrate and human health: An updated review. International Journal of Environmental Research and Public Health, 15(7), 1557.
   
   
9. Leslie, H. A., et al. (2022). Discovery and quantification of plastic particle pollution in human blood. Environment International, 163, 107199.
   
   
10. Bellinger, D. C. (2008). Very low lead exposures and children's neurodevelopment. Current Opinion in Pediatrics, 20(2), 172-177.