What EPA Standards Don't Tell You About Your Tap Water

"Your Water Is Safe" — But Safe According to Whom?

Every year, your water utility mails you a Consumer Confidence Report. It lists the contaminants tested, the legal limits, and a reassuring note that your water meets all federal standards. For most Americans, that's the end of the conversation.

But here's what that report doesn't say: the standards it's measuring against were written decades ago, cover fewer than 100 contaminants, and in many cases set legal limits that are far higher than what scientists consider health-protective. Passing the test and being free of risk are not the same thing.

How the EPA Sets Drinking Water Standards

The EPA regulates drinking water under the Safe Drinking Water Act (SDWA), originally passed in 1974. Under this framework, the EPA establishes two types of limits for each regulated contaminant:

The gap between these two numbers is where the problem lives. For lead, the MCLG is zero — because no safe level of lead exposure has ever been identified. But the action level (the point at which utilities must respond) is 15 parts per billion. That's not a safe level. It's a management threshold.

The Contaminants That Aren't Regulated at All

The EPA currently regulates 90 contaminants in public drinking water. That sounds like a lot — until you consider that there are thousands of chemicals in commercial use, and new compounds enter the environment every year.

*PFAS (Per- and Polyfluoroalkyl Substances)*

PFAS are a family of more than 15,000 synthetic chemicals used in non-stick cookware, waterproof clothing, food packaging, and firefighting foam. They are called "forever chemicals" because they do not break down in the environment or the human body. For decades, they were entirely unregulated in drinking water.

In April 2024, the EPA finalized the first-ever federal drinking water limits for six specific PFAS compounds, including PFOA and PFOS. This is a significant step forward. But the rule covers only six of the 15,000+ known PFAS compounds — and water systems have until 2029 to comply. In the meantime, PFAS have been detected in the drinking water of an estimated 200 million Americans.

For a deeper look at PFAS specifically, read our full article: What Is PFAS and Why Should You Care?

*Chromium-6 (Hexavalent Chromium)*

The EPA has a total chromium standard of 100 parts per billion, set in 1991. But that standard covers all forms of chromium — including the relatively harmless trivalent form. Chromium-6, the toxic form made famous by the Erin Brockovich case, has no specific federal limit. California established its own hexavalent chromium standard in 2024, but most states have no separate protection.

*1,4-Dioxane*

1,4-Dioxane is a probable carcinogen found in industrial solvents, personal care products, and manufacturing runoff. The EPA has issued a health advisory of 35 micrograms per liter and concluded in 2024 that it "presents an unreasonable risk to human health" — but there is still no federal maximum contaminant level. Some states have set their own limits. Most have not.

*Microplastics*

Microplastics have been detected in tap water, bottled water, and human blood. Research on their health effects is still developing, but preliminary studies have raised concerns about inflammation, endocrine disruption, and cellular damage. The EPA has not yet established any monitoring requirements or limits for microplastics in drinking water.

The Age Problem: Standards Written for a Different Era

The Safe Drinking Water Act turned 50 in 2024. Many of the contaminant standards on the books today were written in the 1980s and 1990s, before PFAS were widely detected in water supplies, before microplastics were understood as a health concern, and before the full picture of lead's neurological effects on children was established.

The EPA is required to review each standard at least once every six years. But revising a standard is a lengthy, resource-intensive process — and the agency's regulatory capacity is limited. The result is a system that is perpetually catching up to the science.

What Independent Organizations Say

The Environmental Working Group (EWG) maintains its own drinking water database, which applies stricter health-based guidelines rather than legal limits. When EWG analyzed tap water data from utilities across the country, it found that the vast majority of water systems — while legally compliant — contained contaminants at levels above what EWG considers health-protective.

This isn't a criticism of the EPA so much as a recognition of the difference between regulatory feasibility and optimal health protection. Legal compliance is a floor, not a ceiling.

What You Can Do

Understanding the limits of EPA standards is not a reason to panic — it's a reason to be informed. Here are practical steps:

• Read your annual Consumer Confidence Report. It's mailed to you every year and lists what was detected and at what levels. Look for contaminants that are present even if below the legal limit.
• Get your water tested independently. A certified lab test of the water coming out of your specific tap will tell you far more than a utility-wide average. Order a water quality check through our partner Healthy Hydration.
• Use a certified filter. Filters certified to NSF/ANSI Standard 53 remove health-effect contaminants including lead. Reverse osmosis systems are among the most effective for a broad range of contaminants including PFAS.
• Check your ZIP code report. Our free water report tool pulls real EPA data for your utility and shows you what's been detected, what violations have occurred, and what your risk level looks like.

The goal isn't to distrust your water — it's to understand it clearly enough to make good decisions for your family.

The Bottom Line

Passing EPA standards means your water meets the legal minimums established by a 50-year-old law that covers fewer than 100 contaminants. It does not mean your water is free of all health risks. Dozens of compounds — including PFAS, chromium-6, 1,4-dioxane, and microplastics — are either unregulated or regulated at levels above what independent scientists consider safe.

Knowing this puts you in a better position than most Americans. And knowing what's actually in your water is the first step toward doing something about it.

FranklyH2O provides water quality education based on publicly available EPA data and peer-reviewed research. This article is for informational purposes only and does not constitute medical advice.