How to Properly Flush Your Refrigerator Water Line to Reduce Bacteria and Sediment

Refrigerator water lines accumulate stale water, sediment, and biofilm. These conditions create off-tastes and increase bacterial growth. A proper flush helps restore clean, fresh water. When the line has visible buildup or has been unused for long periods, adding a cleaning and sanitizing step is recommended.

Step 1: Replace the refrigerator water filter

Install a new filter before flushing. Old filters contain collected organic material that supports microbial growth. A fresh filter prevents recontamination during the flush.

Step 2: Run water continuously to clear stagnant water

Place a large container under the dispenser. Run water for two to three minutes or until one to two gallons have passed through. This removes most sediment and stagnant water from the reservoir and tubing.

Step 3: Prepare a vinegar cleaning solution if the line shows buildup

If you notice scaling, cloudiness inside the tubing, or recurring taste issues, disconnect the fridge water line from the wall valve. Flush a mixture of water and white vinegar through the tube to dissolve mineral deposits. Leave the solution inside the tube for 10 to 15 minutes, then rinse thoroughly.

Step 4: Sanitize the line if microbial contamination is suspected

After cleaning, use a potable-water-safe sanitizing solution. Fill the tubing with the solution and allow it to sit for the recommended contact time. This step targets bacteria and biofilm that vinegar alone cannot remove.

Step 5: Reconnect the line and flush again

Reconnect the tubing and run fresh water through the system until the disinfectant odor is gone. This may take several minutes.

Step 6: Clear the ice system

Empty the ice bin. Allow the ice maker to produce new ice. Discard the first batch because it contains pre-flush water.

Step 7: Perform a taste and odor check

Pour a glass of water from the dispenser and evaluate it. The taste should be clean and neutral. If there is still an unusual flavor, the tubing may need to be replaced.

Step 8: Test for bacteria if water tasted odd before flushing

If you flushed the line due to illness, odor, or persistent taste problems, run a Detekt Home bacteria screening test on the dispenser water for reassurance.

Routine flushing every three to six months keeps your refrigerator water fresh and prevents bacterial buildup inside narrow tubing.

By A. Anagnos, Biomedical Engineering Specialist