Under-Sink Filters

Under-sink systems install beneath your kitchen counter and connect to the cold water line. They deliver filtered water through a dedicated faucet or inline to your existing faucet.

Written by WaterFilterMatch Editorial TeamApril 2026

System Cost

$50 - $550

Annual Filters

$26 - $440 in replacement filters

Installation

DIY moderate

How It Works

Water pressure from your supply line pushes water through one to three filter stages mounted in a bracket under the sink. Common configurations include sediment pre-filter, carbon block for chlorine and VOCs, and a sub-micron stage for lead and cysts. Dedicated-faucet models require drilling a hole in your countertop; direct-connect models splice into your existing cold water line with no drilling.

What It Removes

Removes Well

Chlorine and chloramines
Lead, mercury, and heavy metals
PFAS (P473 certified models like Aquasana, Clearly Filtered)
VOCs, pesticides, and pharmaceuticals
Cysts (Giardia, Cryptosporidium)

Does NOT Remove

TDS / total dissolved minerals
Fluoride (except Clearly Filtered model)
Bacteria and viruses
Nitrates
Hardness / scale

Installation

DIY moderate. Direct-connect models (Frizzlife, Waterdrop) need no drilling and take 15-30 minutes. Dedicated-faucet models (Aquasana) require drilling a countertop hole. Basic tools needed: adjustable wrench, Teflon tape.