Under-Sink Filters

Two-stage under-sink water filter mounted inside a kitchen sink cabinet and connected to the cold water line

Under-sink filters treat water at a single tap, usually the kitchen. They're an affordable way to improve drinking and cooking water. HomeGuide estimates under-sink installations at $170 to $580.

Start with our under sink water purifier vs. filter guide. It explains the difference between carbon, RO, and UV systems, which NSF/ANSI certifications matter for which contaminants, and how often to change filters.

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Under Sink Water Purifier vs. Filter: Which Do You Need?