Do You Really Need to Filter Your Tap Water?

Most tap water in Europe is, strictly speaking, fine. It meets the EU Drinking Water Directive. It won’t make you sick. A microbiologist would sign off on it without blinking.

So why does an entire industry exist around filtering something that’s already legal to drink?

We’ll give you the honest answer, not the sales pitch.

What “safe” actually covers

Drinking water regulation is built around a specific question: will this water make people acutely ill? It tests for pathogens, sets limits on known hazards, and checks that treatment plants are doing their job.

What it doesn’t promise is taste, consistency, or peace of mind about substances that are still being studied. Chlorine, used almost everywhere to keep water safe in transit, is added deliberately — and it's also the reason tap water can taste flat or chemical by the time it reaches your glass. PFAS, the so-called “forever chemicals,” are turning up in water sources across the EU in trace amounts that fall inside today’s rules but outside most people’s comfort.

None of this makes your water dangerous. It’s why it can taste like a swimming pool on a Tuesday and be fine on a Friday.

Where the testing actually stops

Here’s the part regulation doesn’t advertise: under the EU Drinking Water Directive (2020/2184), compliance is legally required at the tap — not just at the treatment plant. But the directive itself acknowledges that water quality can be affected by the domestic plumbing between the water main and your kitchen tap, which is exactly why it now takes a risk-based approach covering the whole supply chain rather than a single test at the plant.

In practice, routine monitoring happens at representative points across the network, not inside every individual building. Germany’s own data shows the gap this leaves: between 2017 and 2019, more than 20 water supply areas in Germany were still unable to consistently comply with the lead limit at the tap, even where water leaving the treatment plant was fully compliant — because of lead pipes and non-compliant materials still inside buildings.

That’s not a failure of the testing system. It’s the part of the journey a water utility structurally doesn’t control: the last stretch of pipe between the main and your glass.

When filtering genuinely doesn’t matter

If you live somewhere with soft, low-chlorine water, you like how it tastes, and you’re not losing sleep over PFAS headlines — you don’t need to do anything. Filtering tap water that already works for you solves a problem you don’t have.

The honest trigger for filtering isn’t fear. It’s usually one of three things: the water tastes off, you’re tired of hauling bottled water home, or you’d rather reduce your exposure to things like chlorine, trace contaminants and whatever your own building’s pipes have added along the way.

The part most filters get wrong

Here’s where it gets complicated. A lot of filtration strips water down to almost nothing — removing contaminants, yes, but taking calcium and magnesium along with them. That’s how you end up with water that’s technically pure and tastes like it came from a lab, because it did.

Minerals aren’t a contaminant. The World Health Organization notes they’re highly bioavailable in drinking water and contribute meaningfully to daily intake. Filtering them out along with the chlorine isn’t a feature — it’s a side effect nobody asked for.

So, do you need to filter your water?

If your water already tastes good to you, no. If you’re filtering out of habit or fear without a real reason, you can probably stop worrying about it.

If you’ve noticed the taste, you’re done with plastic bottles, or you simply want chlorine, trace contaminants and whatever your building’s own plumbing adds reduced without losing what makes water taste like water — that’s a real reason. PJURE’s under-sink filter was built around exactly that trade-off: a 3+1 stage system that reduces what you don’t want while keeping the calcium and magnesium in, installed at the one point in the journey you actually control — right before the tap.

Want the technical breakdown of how each stage works? See it layer by layer, or browse the full research in our Water Knowledge library.