How Often Should You Replace Your Water Filter? (2026 Schedule)

From fridge filters to whole-house systems — here's exactly when each one needs replacement.

Schedule at a glance

Frequency	What to do
Every 40 gallons or 2 months	Brita / pitcher filters
Every 6 months	Refrigerator water filters (most brands)
Every 6-12 months	Under-sink reverse osmosis pre-filters
Every 12-24 months	Whole-house sediment filters
Every 2-3 years	Reverse osmosis membrane
Every 5-10 years	Whole-house carbon tank filters

How to do it

Identify the filter type and exact model number (usually printed on the filter or in the manual).
For refrigerator filters: locate the filter housing (often inside the fridge ceiling or behind a kickplate). Twist the old filter counterclockwise to release it.
For under-sink filters: turn off the water shutoff valves above the filter housing first. Have a towel ready for residual drips.
Insert the new filter following the orientation arrow (water flow direction).
Flush the new filter by running 1-2 gallons of water through it before drinking — this removes carbon dust.
Reset the filter-change indicator on your fridge if it has one (usually a long-press button).
Log the install date in FixLog with the model number so reorder is one click next time.

Signs you're overdue

Reduced water pressure at the dispenser
Cloudy, discolored, or smelly water
Visible particles in the water glass
Bad-tasting water (often chlorine-like or metallic)
Filter-change indicator light is red or blinking
Slime or biofilm visible inside the water dispenser

What it costs

$15-$25 for pitcher filters, $30-$60 for refrigerator filters, $20-$80 for under-sink filters, $50-$200 for whole-house cartridges.

FAQ

Is it dangerous to drink water from an expired filter?

Yes, expired filters can be worse than no filter. Once saturated, accumulated contaminants start leaching back into the water (called 'channeling'). Bacteria can also grow inside an old wet filter media.

Why are refrigerator filters so expensive?

Brand-name OEM filters are typically $40-$60 each because of margin, not cost. Generic NSF-certified equivalents from brands like Waterdrop or PureSource cost half as much and meet the same NSF Standard 42/53 specs.

Does a whole-house filter mean I don't need a fridge filter?

Usually not. Whole-house sediment filters catch large particles but not chlorine or taste/odor compounds. Fridge filters use carbon to polish the taste. You typically want both — but the fridge filter can last longer if a whole-house pre-filter is removing sediment upstream.

What happens if I forget to replace my fridge filter for a year?

Beyond the 6-month mark, contaminant removal drops sharply. The carbon becomes saturated and stops adsorbing chlorine, lead, and VOCs. Bacteria can begin growing on the wet media. The filter still produces water — just unfiltered water at this point.

Stop tracking this in your head

FixLog reminds you when each maintenance task is due — water filters, HVAC filters, gutters, septic, every appliance you own. Snap a photo of an appliance label and FixLog reads the model number with on-device OCR. No cloud, no accounts, no creepy data collection.

Get FixLog on the App Store

How Often Should You Replace Your Water Filter?