The Best Water Filtration Systems

Water filtration is the category where marketing does the most damage. Almost every pitcher on a supermarket shelf is certified for one thing — chlorine taste and odour — and quietly implies it does much more. If your only complaint is that your tap water tastes of swimming pool, a $20 filter fixes that completely and you can stop reading.

If you are worried about lead, PFAS or fluoride, the brand name is irrelevant and the certification is everything. Look for NSF/ANSI standard numbers printed on the box: 42 is taste and odour, 53 is health-related contaminants including lead, 58 is reverse osmosis, and 401 covers emerging contaminants like pharmaceuticals.

How we pick

We prioritise independently certified performance over manufacturer claims, which is the only defensible way to rank this category. Consumer Reports, CNN Underscored and Wirecutter all run contaminant-reduction testing, and we weight NSF and IAPMO certification heavily — a filter that has been through third-party validation beats one with a longer marketing list every time.

We also factor in cost per gallon over three years, not sticker price. ZeroWater is the cheapest unit here and among the most expensive to run; the Aquasana is the reverse.

One thing worth doing before you buy anything: look up your local water utility’s annual Consumer Confidence Report. It is free, it is public, and it tells you what is actually in your water — which makes this whole decision much simpler.

Prices and ratings come from live Amazon listings on July 20, 2026.

The honest advice

Get your water report first. If lead or PFAS show up, install the Aquasana under-sink — it is the best balance of certification, flow and running cost. If you want maximum removal and don’t mind the plumbing, the Waterdrop G3P600. If you rent, or you just want better-tasting water, the Brita 10-Cup with an Elite filter is genuinely all most households need.