Is tap water safe to drink?

Megan Brooks said:The lead pipes don't matter because if they did, elderly people would be dropping dead from poisoning en masse by now. As soon as water starts moving through a pipe, a layer of limescale builds up on the inside and seals off the toxins. That’s what my professor taught me. If you know Haraminčić, you know his word is gospel.

Sure, there's some truth to that, but it's equally true that we use much more chlorine now, and chlorine dissolves scale. When a chunk of that buildup flakes off, it takes the lead right along with it. And regarding the elderly dying—people die from everything under the sun, including the massive surge in cancer rates. Heavy metal poisoning can certainly be one of those contributing factors behind malignant diseases. If your professor were actually right, we'd still be installing lead pipes in modern homes instead of switching to plastic.
Anyway, drink whatever water works for you, whether it's based on your budget or how it tastes. In Washington, D.C., I stick to bottled water, but when I'm out in the suburbs, I just use the tap.

We’ve been relying on bottled water for years now. Honestly, grabbing the 5-liter jugs from the grocery store usually ends up being the most cost-effective way to go. That said, whenever I run out of supplies, I just boil some tap water and drink it that way. Personally, I don't quite trust the quality of the water coming straight out of the faucet for drinking, so if you have the means, buying bottled is probably your best bet—unless, of course, you decide to invest in a high-quality water filtration system instead!

Angela Wright said:That’s certainly true, but we also have to consider that increased chlorination can dissolve mineral buildup, which might cause lead to flake off along with the scale. As for the elderly passing away, people die from many things, including the rising rates of cancer, and heavy metal poisoning is one of those factors that can contribute to such illnesses. If your professor is completely right, then why would anyone still be installing lead pipes today instead of using modern plastic?
Anyway, just drink whatever water makes sense for you, whether that's based on what's easiest on your wallet or how it tastes. When I'm in Washington, D.C., I usually stick to bottled water, but when I'm back home, I just use the tap.

When I mentioned old plumbing, I was specifically referring to the systems built back in the 30s, 40s, or 50s... back then, plastic piping simply wasn't an option yet.

Bradley Nelson2 said:speaking of America... I wouldn't personally recommend drinking the tap water there👍
after all, I was watching an environmental documentary where they showed how factories dump their waste directly into the drinking supply just because it's cheaper than proper disposal 😁, which doesn't seem particularly healthy.

I know someone from Baltimore... I don't really know him personally, we just met in a chat room, but he mentioned that he drinks the tap water without any issues, so perhaps the water supply isn't as contaminated there as people think?

Here’s a quick take on a health-related topic that I actually know a thing or two about.
Regarding the whole lead scare—I want to clarify right away (I promise to double-check this in the next few days)—but usually, that reddish tint in water comes from iron. Honestly, the tap water in Washington, D.C. is top-tier for both drinking and bathing. For those people who basically pay a "fool tax" by buying bottled water by the liter instead of using the tap, my advice is to start showering in it too. Since skin is our largest organ, if you aren't drinking the tap water, you're just throwing money away if you're still using bottled stuff to wash. As for chlorination, chlorine levels at no destination ever exceed the maximum allowable concentration. Also, chlorine can be tricky when mixed with organic matter because it creates trihalomethanes (you might know it as chloroform). So, in a place like a rural county, for example, besides not drinking from the faucet, you probably shouldn't even wash with it—especially if you're pregnant! In Washington, D.C., the oxidation levels are well below the limit, so there's nothing to worry about. The local water supply (except for Petrusevac, where they handle manganese removal) doesn't undergo any treatment other than disinfection. Basically, according to its classification, it's just natural spring water. It's exactly like almost everything else you'd buy in a bottle. If you happen to stumble upon some "premium" bottled water, just remember that even sewage can be processed until it becomes drinkable; that's all it really is. With reverse osmosis, you strip it down to just H+, OH-, and H2O, then use dosing pumps to add minerals back in, use NaOH to balance the pH, and finally disinfect it again.
When it comes to bottled waters, quality and composition vary wildly. Even if everything is done strictly by the book, some brands wouldn't even make it onto your shelves due to things like elevated manganese or even uranium levels. I think I might have said a bit too much there.
As for mercury, I don't know where those rumors come from, but I can say with total confidence that it isn't there.
Hope this helps!
And that white residue you see when water flows through your faucet? That isn't chlorine; it's just oxygen. You can let go of that misconception now.

Sorry I'm a little late to the party with this one, but hey, better late than never, right? Ozone. Honestly, where do we even start with this stuff? It’s one of those things that sounds like some high-tech miracle ingredient until you actually look at the science behind it. People love to toss the word around like it’s some kind of magic wand that can fix everything from bad smells to water quality, but let me tell you, it’s a bit more complicated than a late-night infomercial makes it out to be. It’s like when people talk about "organic" food—everyone wants a piece of it because it sounds pure and safe, but if you don't understand the process, you might end up swallowing something you really didn't intend to. Ozone is powerful, sure. It’s an oxidizer. It tears through bacteria and organic matter like a wrecking ball through a drywall partition. In industrial settings or for treating large bodies of water, it's a beast. But then you have people using these little gadgets in their living rooms, thinking they're turning their apartments into a mountain retreat, when in reality, they're just playing with chemistry they don't quite grasp. It's all about balance. Too much of a good thing—even something as fundamental as oxygen molecules being rearranged—and suddenly you've gone from "fresh scent" to "irritating my lungs." It reminds me of how people handle spicy food; a little bit of heat adds flavor, but if you go overboard, you're just sitting there crying and regretting every life choice that led you to that habanero. Use it right, and it's a tool. Use it wrong, and you're just creating a headache. Look, I’m telling you, ozone is a beast. We're talking about an oxidizing power that absolutely smokes chlorine in a head-to-head fight. And the best part? Since it’s basically just pure oxygen, it doesn't leave behind any of those nasty, toxic residues that mess up the environment. It’s clean. Period. Scientific studies have already backed this up—ozone is incredibly efficient at nuking mold spores, viruses, bacteria, and all sorts of other pathogens and organic chemicals. It’s like a microscopic wrecking ball. But here’s the catch: because it’s chemically unstable, it doesn't stick around forever. It’s got a super short "lifespan." Once it hits organic junk, it speeds up its own breakdown process. After it finishes oxidizing everything in sight, it naturally snaps back into regular oxygen. Because of that instability, you can't just bottle it up on a shelf like some canned soda; you have to generate it right there on the spot exactly when you need it. When it goes to work, it destroys bacteria and fungi by literally ripping their cell membranes apart. It breaks down organic compounds into their simplest possible molecules just to get the job done—sterilization through total molecular destruction. Even ozonated water eventually just turns back into plain old water. No poisonous gases, no pollutants, no leftover junk. Just clean.
So, here’s the deal with chlorination: you end up with what they call residual chlorine. Basically, it’s just leftover chlorine that didn't actually get used up fighting off bacteria in the water. The maximum acceptable limit is around 0.5 mg/kg, and from what I’ve seen while testing the water over in Cincinnati, those levels are constantly hitting the absolute ceiling. And let me tell you, that stuff is proven to be garbage for our health. As for the water supply in Washington, D.C., the number of available sources is shrinking because of all the pollution out there. Honestly, who can even guarantee that the water coming out of your tap right now isn't coming from a source that's scheduled to be shut down any day now? It’s sketchy. My advice? Don't just drink it straight. Get yourself a filter—something like a Brita or a Zepter—or if you want to go full DIY, you could even grab a home ozone generator to treat it. Just take care of yourself.

An ozone generator at home??? You might as well just pass out from the fumes. :-))
Ozone has plenty of downsides, and honestly, we still don't fully understand many of its chemical reactions. For instance, it can destroy the active sites on coagulants that you dose into water to get rid of things like turbidity or arsenic.
Plus, a lot of that ozone escapes back into the air, which makes it a literal poison—meaning you’re just polluting the air people breathe.
On top of that, the lifespan of oxygen in ozone form is so incredibly short that it barely has time to react with contaminants sitting in your pipes or your tap.
Chlorine is a gas, but its solubility in water is very low. If the smell bothers you, just let the water sit for a bit or boil it; that'll drive the gas out pretty quickly. The regulated amount of residual chlorine (the extra bit left over to handle any sudden contamination) is kept between a minimum of 0.2mg/L and a maximum of 0.5mg/L. That provides a safety margin—something you just can't achieve with ozone.
Sure, chlorine isn't perfect, but you have to do something to kill the microbes. It's just one tool in the shed alongside ozone, UV, and a whole bunch of other options.
Water has become pure marketing. So many people smelled dollar signs in it that now companies are selling absolutely everything under the sun. I’ve heard plenty of stories about people getting totally ripped off. So many "analysis" companies and filtration specialists pop up, come to your house, filter your water, and then suddenly everything looks dark or weird. Please, don't be sheep! Some things work for some people, but it depends. A specific purifier might make sense for one well, but the next well might have a different vein, a different composition, or need a completely different treatment. There is no "one size fits all." Just like how no two people are exactly alike, no two water sources are the same. Making impulsive moves that end up costing you money could actually cause way more harm than good in the long run.
I’m a chemist by trade, so my only real obsession is water. All I know is chemistry, and I manage fine on my own without paying for outside analyses—which, luckily, I can run myself. I make my own calls because... well, talk is cheap, but experience is real.

Chlorine is a corrosive gas; its vapors absolutely wreck your eyes and lungs. Just 15 ppm in the air can leave your throat feeling raw, and once you hit 50 ppm, you're looking at serious danger even if you're only exposed for a short burst. So, go ahead, keep boiling massive pots of water in some tiny, cramped kitchen with the windows shut tight. You might think you'll be fine, but I certainly can't guarantee anything for that little pet bird sitting in a cage right next to the stove...
By the way, the very first chemical warfare agents were actually built using that exact same chlorine.
I came across an interesting piece published in the Council of Nicaea, and I pulled this specific excerpt out for you:
"Scientists from the University of Notre Dame recently released a study claiming that swimming and spending time around pools is a significant risk factor for children developing asthma (EHP 2006,114,1567). Beyond convincingly linking childhood asthma to pool environments that are constantly polluted by chlorine degradation byproducts, this study raises other critical concerns. Chief among them is the safety of drinking tap water that undergoes regular chlorination. The process of chlorinating drinking water also creates a whole host of harmful byproducts, even when concentrations remain low..."
Some research suggests that long-term exposure to chlorinated water actually bumps up the risk of bladder and rectal cancer.
Quick question for my colleague feralwolf24: Why do wealthy nations opt for ozone treatment for their drinking water? Are they just trying to poison their own people?

So, after they finish the ozonation process, what else do you think they add to the water to make sure it stays disinfected while traveling through the pipes?
And look, even NaCl can be toxic if you get enough of it—we're talking about common table salt here. Everything around us has a potential downside. It all comes down to dosage and how much we actually ingest. It’s rarely black and white, and I think it's a mistake to oversimplify things. Biology, chemistry, metabolism... it's all way more complex than a single study or a random number can explain. It's also worth noting how much influence marketing and consumer psychology have nowadays. It's basically become its own science. Just look at how modern grocery stores are designed to manipulate your mood with specific scents and music. They'll put those impulse buys right at eye level so you can't miss them, while the staples you actually need, like sugar, salt, or flour, are tucked away on the bottom shelves. You really have to stay sharp because people are so health-conscious now, and retailers are fully aware of that. Sometimes the tactics they use to move product feel pretty dirty and pathetic.

I honestly have no clue what they actually pump back into the water after the ozonation process, and it’s been bugging me lately. Same goes for what happens right after chlorination. What's the deal there?
Chlorinating drinking water is a century-old trick, so you'd think by now we would have come up with something way more advanced and efficient. I'm all for making sure water treatment in America is done using the absolute best tech available so we can all stop worrying about what's actually coming out of our taps.
If you really want to see what I mean, take a look at cancer rates and how they've shifted over the last seven years—you could look at data from somewhere like Cook County, for example. In a place like San Diego County, you'd see numbers jump from roughly 8,500 new cases back in 2000 to about 10,800 by 2005. If we supposedly have clean water and clean air, why are Americans getting sick at such high rates? Is it just bad food and stress, or is there something deeper going on?

I’m not sure what part isn't clicking here. Let's play out a scenario: suppose ozonated water actually reduced illness—everything from minor aches to serious tumors. How much would it cost the government to treat all those individual health issues? An astronomical amount. Now, how much would it cost to install an ozone generator in every single treatment plant across the country? Also a massive amount. But there's a huge difference between "astronomical" and "massive." Do you honestly think it would be cheaper to pay for healthcare than to buy ozone generators if it could cut illness rates by even 5%? Setting aside any sense of humanity for a second, if your simplified logic were true, the math would be so obvious that the powers that be would have implemented it ages ago.
Most of the newer water treatment facilities in the US are unnecessarily expensive—which ends up hitting regular consumers through their monthly bills. This happens because everything from heat exchangers to high-powered compressors and membranes gets installed just to drive sales, whether it's actually needed or not. For instance, why would a treatment plant bother with an ion exchange system specifically to remove ammonia? It’s incredibly pricey and a nightmare to maintain, even though it's a highly developed modern tech. We’ve been successfully removing ammonia biologically using sand filters and sufficient oxygen for decades, getting it down to 0mg/L quite easily and cheaply. New tech has its place, but it doesn't automatically make older, proven methods obsolete. That ion exchange might be great for tackling something like arsenic, which might justify the cost. Maybe not, though. (That’s just my take since I’ve been working on this for a while; if we can find a competitive way to make an ion exchanger work without needing regeneration, it’ll be much cheaper, and everyone wins.)
I don't really know what else to say. I think you get where I'm coming from, and I definitely get where you're coming from. I’m not trying to push my views on you or change your mind. This is a public forum used by tons of people. They are all paying for water, and they're all paying the same rate. My only concern is that people shouldn't throw money away buying bottled water that might actually be lower quality than what comes out of their tap at home (depending on where they live). Or worse, someone installs a home ozone generator and ends up with health issues if the ozone leaks out of the water. I just want to say: don't be closed-minded about any single approach. If you think your water isn't up to par, grab a sample (I can show you how), pay for a lab analysis, and then take action based on the results.
That's all from me.
Matthew Hall37, I'm not trying to outsmart you, nor do I see any point in going there. It's just not productive.

I was wondering about the tap water situation down in Miami? Is it actually safe to drink straight from the faucet, or am I gonna be stuck constantly buying cases of bottled water?
If anyone could give me the scoop on the water quality in St. Louis and Memphis too, that would be awesome.
🙂

Back in my university days, during one of our water science courses, they went on and on about how bottled water is basically a scam. Their whole argument was that manufacturers aren't allowed to run any kind of heavy-duty sterilization on the stuff... and we all know just how much bacteria can be lurking in water. Plus, there's the issue of how long that water actually sits in those plastic bottles; bacteria can multiply incredibly fast in those conditions. Honestly, you're better off just sticking to tap water—it’s usually higher quality than the bottled junk anyway.

Sophia Williams10 said:there’s this spring near some small town outside of Philly with amazing drinking water! I actually use it for my dishes and showering... honestly, in the summer, I even rinse my hair with it. You can totally feel the difference...

I usually head out to the spring near Kašin, but man, it is always packed. I’ve literally stood there waiting for like 2 or 3 hours just to get some. I was chatting with the folks out there filling up jugs, and they mentioned there are other springs scattered along the ridge and even closer to that area near Philly. Does anyone know how I can find them? Seriously, any direction helps! thanks

There’s a spring down by the creek at the base of Mount Rainier, just before you hit the Boulder sawmill. I usually grab some water there before heading up a trail... Anyone happen to know if the water quality from that spot is actually any good?