The framing most of us inherited: if the government says the water is safe, it is safe. Municipal water meets EPA standards before it reaches your tap. In that narrow legal sense, your water is safe.
But there is a more important question almost nobody asks: what does "safe" actually mean, and is it the same as "healthy"?
The short answer is no. And the story of PFAS, per- and polyfluoroalkyl substances better known as "forever chemicals," shows that gap as clearly as anything in modern environmental health.
What Government Standards Are Actually Designed to Do
The EPA sets Maximum Contaminant Levels for substances in drinking water. These are not designed to optimize your health. They are designed to prevent measurable harm at a population level, while accounting for what is economically and technically feasible for utilities to achieve. That is a very different goal from asking what is actually safe for your family to drink every day for thirty years.
Legal limits for many contaminants in tap water have not been meaningfully updated in nearly twenty years, according to the Environmental Working Group. The science on which those limits were based is two decades old. The contaminants we were not yet looking for when those limits were set are now showing up everywhere.
Your municipal water is sanitary. Regulated. Monitored against standards that were written with acute public harm as the benchmark. What it is not, necessarily, is healthy in the sense of being optimized for long-term exposure across the full range of what it contains.
The PFAS Problem
PFAS are a class of thousands of synthetic chemicals used in manufacturing since the 1940s. They appear in nonstick cookware, food packaging, firefighting foam, waterproof fabrics, and stain-resistant coatings. What makes them distinct is their chemical stability: the bonds that make them useful industrially are also bonds that do not break down in the environment or in the human body. They accumulate. They persist. That is where "forever chemicals" comes from.
Research has linked PFAS exposure to certain cancers, thyroid disease, immune dysfunction, reproductive harm, and developmental effects in children. In 2022, the EPA concluded that virtually any detectable level of PFOA and PFOS — two of the most studied PFAS compounds — carries some degree of health risk.
After decades without federal regulation, the EPA finalized the first legally enforceable drinking water limits for PFAS in April 2024: 4 parts per trillion for PFOA and PFOS individually. For context, 4 parts per trillion is roughly equivalent to four drops of water in an Olympic swimming pool.
In May 2025, the EPA announced it would retain those 4 ppt limits for PFOA and PFOS, but extend the compliance deadline from 2029 to 2031. The agency also pulled back on regulations for four other PFAS compounds — PFHxS, PFNA, GenX, and PFBS — which will go through additional rulemaking before any limits apply. Until 2031, a utility can have PFOA and PFOS in its water above the limit and face no enforcement. For the four other compounds, there is currently no enforceable federal limit at all while rulemaking continues.
The science said PFAS are harmful at very low levels. The federal government took thirty years to set limits. Then it extended the deadline by two years and reduced the number of compounds regulated. Until 2031, homeowners who want to address PFAS exposure cannot wait for the system.
What Else Is in There
PFAS get the most attention right now because the regulatory story is current news. But they are not the only gap between "legal" and "health-protective" in municipal water.
Chlorination byproducts. Chlorine is essential for disinfection. When it reacts with organic matter in source water, it forms trihalomethanes (TTHMs) and haloacetic acids (HAAs). Both are regulated. Both are linked to increased cancer risk and reproductive harm with long-term exposure. Both show up in many Tri-Cities utilities above EWG's health-based guidelines, while remaining within legal limits.
Heavy metals. Lead has no safe level of exposure. The EPA's action level is 15 parts per billion — a compliance threshold, not a safety threshold. Chromium-6, a carcinogen, is detected in many water supplies with no federal MCL. Arsenic has a federal limit of 10 ppb, but EWG's guideline is 0.004 ppb. That is a gap of over 2,000 times.
Endocrine disruptors. Compounds that interfere with hormonal systems — certain herbicides, pharmaceuticals, industrial chemicals — are present in many water supplies and largely unregulated because they predate the regulatory framework or fall outside current MCL categories.
The EWG Tap Water Database is the most accessible tool for seeing which of these show up in your local supply. Search your zip code and you will see detected levels compared to both legal limits and health-based guidelines. The gap between those two numbers is the gap between "legal" and "healthy."
What Actually Removes These Contaminants
The good news: home treatment works, and it works well.
Reverse osmosis is the most comprehensive option for dissolved contaminants. It removes PFOA and PFOS to very low levels, along with heavy metals, nitrates, arsenic, and fluoride. NSF/ANSI Standard 58 is the certification to look for.
Activated carbon filtration addresses chlorine and significantly reduces TTHMs and HAAs. For chloramine, catalytic carbon is required. Carbon does not reliably remove PFAS, heavy metals, or nitrates at meaningful levels on its own.
A combination of whole-house carbon filtration for shower and cooking exposure and an under-sink RO system for drinking water covers the widest range of concerns.
Finding Out Where You Stand
If you are on municipal water in the Tri-Cities or surrounding region, the EWG Tap Water Database is the starting point. Search your utility and see what has been detected in your supply. Then schedule a free in-home water test to see what is actually coming out of your specific tap, which can differ from the utility average based on pipe age and your home's plumbing.
If you are on a private well, you have no regulatory protection at all, and no utility testing to reference. Testing is the only way to know.
Mountain View Pure Water and Air offers free in-home water testing throughout the Tri-Cities and surrounding region. No sales pressure. We sit at your kitchen table, test your water in front of you, and tell you honestly what we find and what, if anything, makes sense to do about it. Schedule at mvpwater.net or call 423-218-9361.
