Most of us grew up with a simple assumption: 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, the 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" — makes that gap clearer than anything else in modern environmental health.
What Government Standards Are 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 feasible for utilities to achieve. That is a very different goal from asking what is genuinely safe to drink every day for thirty years.
According to the Environmental Working Group, legal limits for many contaminants in tap water have not been meaningfully updated in nearly twenty years. The science behind those limits is two decades old. Contaminants we were not yet looking for when those limits were set are now showing up everywhere.
Your municipal water is sanitary, regulated, and monitored. What it is not, necessarily, is optimized for long-term health across the full range of what it contains.
The PFAS Problem
PFAS are thousands of synthetic chemicals used in manufacturing since the 1940s. They appear in nonstick cookware, food packaging, firefighting foam, and waterproof fabrics. What makes them distinct is their chemical stability — the same bonds that make them industrially useful also mean they 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, and developmental effects in children. In 2022, the EPA concluded that virtually any detectable level of PFOA and PFOS 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. For context, 4 parts per trillion is roughly four drops of water in an Olympic swimming pool.
In May 2025, the EPA retained those limits but extended 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 are now going through additional rulemaking. Until 2031, a utility can have PFAS above the limit and face no enforcement action.
The science said PFAS are harmful at very low levels. The federal government took thirty years to set limits. Then it extended the deadline and reduced the scope of what is regulated. Homeowners who want to address this exposure cannot wait for the system to catch up.
What Else Is in There
PFAS get the most attention right now, but they are not the only gap between "legal" and "health-protective."
Chlorination byproducts form when chlorine reacts with organic matter in source water, producing trihalomethanes and haloacetic acids. 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.
On heavy metals: lead has no safe level of exposure. The EPA's action level of 15 parts per billion is a compliance threshold, not a safety threshold. Arsenic has a federal limit of 10 ppb, but EWG's guideline is 0.004 ppb — a gap of more than 2,000 times.
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. Look for NSF/ANSI Standard 58 certification.
Activated carbon filtration addresses chlorine and significantly reduces trihalomethanes and haloacetic acids. For chloramine, catalytic carbon is required. Carbon alone does not reliably remove PFAS, heavy metals, or nitrates.
A whole-house carbon system for shower and cooking water combined with 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, the EWG Tap Water Database is the right starting point. 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 your home's plumbing.
If you are on a private well, you have no regulatory protection 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. We test your water in front of you, explain what we find, and tell you honestly what, if anything, makes sense to do about it.
Schedule at Mountain View Pure Water or call 423-218-9361.
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