Best water filter for your home in 2026: pitcher, under-sink, countertop RO or whole house

There are four common ways to filter water at home, and the right one depends on your tap water, your space and whether you rent. This guide explains each type and shows current prices from Waterdrop, one of the more common brands on the market. We have not lab-tested these filters; for any filter, check the certifications on the product page (NSF/ANSI numbers) for the contaminant you care about.

Step 1: know what is in your water

Your water utility publishes a yearly report (search your city name and "water quality report"). Look for lead, PFAS, chlorine taste and hardness. Lead and PFAS are the usual reasons people buy a filter. An inexpensive home test kit can also tell you about hardness.

Step 2: pick the type

Pitcher or faucet filter (about $35 to $50). No installation. A good option for renters and for improving taste and chlorine. A pitcher is the simplest place to start.

Under-sink filter (about $60 to $220). A small cartridge system under the kitchen sink, with a separate faucet or a tee on the cold line. It takes more effort to install, but there is no countertop clutter and filters last months.

Countertop reverse osmosis (about $160 to $430). Reverse osmosis removes much more than carbon filters, including many dissolved solids. Countertop models need no plumbing: you fill a tank and plug it in. Several add minerals back for taste.

Under-sink reverse osmosis (about $250 to $850). The most thorough option for drinking water, built into the sink. Tankless models save space and waste less water than older RO systems.

Whole house filter (about $165 and up). Filters every tap and shower. It is mainly for sediment and chlorine, and it needs plumbing, so owners rather than renters usually install them.

Costs to remember

Filters need replacing. Check the price of replacement cartridges before you buy, because they are the real cost over three years. Some RO systems waste water; tankless models waste less.

Quick picks

• Renting: a pitcher or faucet filter.
• Own the home, want great drinking water: under-sink RO.
• Want RO but cannot plumb: countertop RO.
• Hard water, chlorine in showers: whole house.

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