Best Faucet-Mounted Water Filters of 2025

Below are the three top-performing faucet-mounted water filters from our tests.

The pros: Faucet-mounted water filters offer better performance and cost a little more than water filter pitchers, but they’re still relatively inexpensive (ranging from $15 to $80) compared with countertop and under-sink types. They don’t require countertop space or professional installation, making them initially affordable. To install, just unscrew the aerator on your existing tap and screw on the faucet filter.

The cons: Faucet-mounted filter capacity is limited, so they typically don’t filter as many contaminants and gallons as most countertop and under-sink filters. They’re also not effective at removing bacteria or viruses. Their cartridges need more frequent replacement, leading to more deferred costs. They can be bulky and may not fit all spouts. Faucet-mount water filters can also slow your water flow.

Not all faucet-mounted filters are the same. Different filters are certified to reduce different contaminants, so choose a high-capacity faucet-mount filter that reduces impurities particularly concerning to you.

If you’re not sure what’s in your tap water, obtain a water-quality report (called a consumer confidence report, or CCR) from your local water supplier to see which contaminants need filtering. If you get your water from a well, you can have your water tested by an EPA-certified lab. Two labs that performed well in CR’s tests were SimpleLab and WaterCheck from National Testing Laboratories.

While shopping, don’t get duped by manufacturers’ claims that a filter was “tested to” a specific standard. Make sure it’s certified for removal of that contaminant by an independent certifying organization like the National Sanitation Foundation (NSF), Water Quality Association (WQA), or the International Association of Plumbing & Mechanical Officials (IAPMO). Products certified by these organizations are regularly monitored and subject to follow-up testing over a period of time.

Pay close attention to capacity, flow rate, and clogging while choosing a water filter. CR members can review our ratings scores for each criterion. Capacity will tell you how many gallons each cartridge is designed to filter, the flow rate will reveal how long it takes the filter to cleanse one quart of water, and the clogging score shows how much the flow rate decreases over the filter cartridge’s life span. You can also choose a device with a filter-life indicator, which tells you when it’s time to replace the cartridge.

For more on all types of water filters, see our water filter buying guide and complete water filter ratings to help you narrow down your choices. In our ratings, we also note contaminants each faucet filter is certified to reduce.

CR tests faucet-mounted water filters for flavor and odor reduction, flow rate, and how quickly they clog (indicating the need for a filter cartridge replacement). We also verify whether they’re independently certified to accepted standards for the reduction of lead, chlorine, and PFAS. Third-party certification is how you’ll know if a water filter’s contaminant removal claims can be trusted.

All but one of the faucet-mounted filters we tested were very good at reducing unpleasant tastes and odors. Several are certified to remove chlorine and lead, but only one is certified to remove PFAS.

To determine how faucet-mounted water filters perform, we filter hundreds of gallons of water until each filter cartridge reaches its advertised life span. Faucet filter flow rates ranged from excellent to mediocre, with the top three not clogging over the cartridge life span. Two, however, failed dismally, with poor clog rates. Neither of those had a filter-life indicator, making it important to monitor your cartridges closely. Our price checks found that filter replacement costs ranged from $36 up to $86 per year.