A refrigerator water line looks simple: a quarter-inch tube from a valve to the back of the fridge. It's also one of the most common sources of slow, hidden leaks under kitchen floors and cabinets. A line that's kinked, pinched, poorly connected or made of the wrong material can drip for weeks before anyone notices. If you're installing one, or replacing an old one, take the time to do it carefully.
Check local codes and your lease or HOA rules before you start. If you're not comfortable working with household plumbing, a plumber is the right call.
Before you begin
- Read the refrigerator's installation guide. It lists the tubing size, the minimum and maximum water pressure, and what type of line the manufacturer recommends.
- Choose the tubing. Many manufacturers recommend copper or braided stainless steel. Samsung's guidance, for example, describes a water line kit that uses 1/4 inch copper tubing, and Whirlpool recommends copper tubing to help prevent off taste and odor. Braided stainless lines with threaded fittings are also widely used. Thin plastic tubing is the most likely to crack or get pinched.
- Choose the valve. A quarter-turn shutoff valve at the supply is easier to operate and more reliable than self-piercing saddle valves, which many manufacturers and plumbers advise against.
- Plan the route. The shortest safe path from the supply, usually under the sink, to the refrigerator. Avoid routes past heat sources, sharp edges or places where the line could be crushed.
- Measure the slack. Leave enough extra line, coiled loosely behind the fridge, to pull the refrigerator out for cleaning without stressing the connection.
Installation
- Turn off the water supply.
- Install the shutoff valve per the manufacturer's directions or have a plumber do it.
- Run the line along the planned route. Secure it so it can't be pinched by cabinet doors or the refrigerator's wheels.
- Connect the line to the refrigerator's inlet using the correct fitting. Don't overtighten compression fittings.
- Turn the water on slowly and check every connection with a dry paper towel. Look again after an hour, and again the next day.
After installation
- Install and flush the filter. Run several gallons through the dispenser to clear air and carbon fines; follow the manual's amount.
- Discard the first few batches of ice.
- Push the fridge back carefully without crushing or kinking the line. Use a flashlight to check after it's in place.
- Check under the fridge a week later for any sign of moisture.
Mistakes we see most often
- A line pushed so far behind the fridge that it's folded flat against the wall.
- A plastic line running through a cabinet where pots and pans crush it.
- Compression fittings that were reused from an old line and no longer seal.
- A saddle valve on an old copper pipe that has started to weep.
- No shutoff valve at all, so stopping a leak means shutting off water to the whole house.
Hard water considerations
Hard water in much of San Diego County can build scale in the refrigerator's inlet valve and the filter. Replacing the filter on schedule protects the valve. If your home has a water softener or a reverse-osmosis system, check the refrigerator manual; some RO systems reduce water pressure below what the fridge needs.
Condos and apartments
In a high-rise condo downtown or a multi-unit building, a water line leak can reach the neighbors below. Building rules often require specific materials or a professional plumber for any water connection, and some require a leak detector or drip pan. Check with your HOA before you start. Our downtown San Diego service area page covers how we coordinate building access.
Signs of trouble
- Water on the floor in front of or under the fridge.
- Warped or discolored flooring near the refrigerator.
- Slow dispensing or small ice cubes, which may mean a kinked line.
- A hissing or dripping sound when the ice maker fills.
If you find a leak, turn off the shutoff valve right away. If the line and fittings look fine and the water seems to come from inside the fridge, the inlet valve or an internal line may be the source. Our refrigerator technicians can track it down. If the ice maker isn't producing after installation, check the ice maker care steps first.
Once it's installed, write the date on a piece of tape near the valve. In five years you'll know exactly how old the line is.