How often should a refrigerator water filter be replaced?

Replace at the first limit: time or rated capacity

Use the replacement schedule published for the exact cartridge and refrigerator. When both a time interval and a gallon capacity are published, replace at whichever limit arrives first.

Six months is common in the reviewed inventory, but it is an example of manufacturer guidance, not a universal life for every refrigerator filter.

Evidence: CDC

Evidence: GE Appliances

Evidence: LG Electronics

Treat slow flow as a troubleshooting signal, not a diagnosis

Reduced flow can occur when a cartridge reaches its service limit, but supply pressure, a valve that is not fully open, or an installation problem can produce a similar symptom.

Confirm the cartridge is seated correctly and follow the appliance troubleshooting instructions before assigning the cause to filter age.

Evidence: CDC

Evidence: GE Appliances

Evidence: LG Electronics

Taste does not prove that a filter is still within its claim

Pleasant taste or unchanged appearance does not verify every contaminant claim. Check the exact model’s performance evidence and follow its maintenance schedule instead of extending service life because water still tastes normal.

If the required claim is not published for the exact model, label the gap as pending rather than treating a standard number as a complete contaminant list.

Evidence: CDC

Evidence: NSF

Six months is common, not universal

Many major refrigerator-filter families specify replacement at approximately six months. Some also provide a gallon capacity such as 170, 200 or 300 gallons. The exact manual and performance sheet control.

Replace sooner when the rated capacity is reached

A high-use household can reach the gallon rating before six months. Reduced flow can also indicate loading, but it can have other causes such as supply pressure, a partially closed valve or an installation problem.

Do not extend life because the water still tastes fine

Taste and odor are not reliable indicators of all contaminants. A filter’s rated service life is based on test conditions and its exact claim set, not on whether the water remains pleasant.

Use a calendar reminder

Each filter page on WaterFilterSpecs can generate a private calendar file in your browser. No account or email address is required.