Faucet Spitting Air? 5 Causes and How to Fix Each Fast

You turn on the faucet expecting smooth water and get a sputtering, hissing, air-burst mess. Maybe water shoots sideways. Maybe it pulses on and off. Either way, the cause is one of five things, and four of them are free DIY fixes.

Before you start, pay attention to two clues that narrow the diagnosis down to one step: does it happen only on hot water, only on cold, or both? And does it happen at all faucets or just this one?

Start With These 30-Second Checks

1. 1Run the faucet for a full 60 seconds. If the spitting clears up, it was just trapped air working its way out (Cause 1).
2. 2Try another faucet in the house. Only this one spits = local problem (aerator, cartridge). Multiple faucets spit = system-wide problem.
3. 3Try hot vs cold separately. Hot-only spitting points at the water heater.
4. 4Look up at the aerator (the screen at the tip of the faucet). Coated in white scale or visible debris = unscrew and clean.

1. Air Trapped in the Lines

If your water was shut off recently (city work, repair, vacation, well pump cycle) air enters the pipes. Turning the water back on traps that air in pockets until something forces it out. This is the most common cause and self-resolves with use.

1. 1Open every faucet in the house, hot AND cold, starting with the one closest to your water meter or pressure tank.
2. 2Run each for 1-2 minutes until water flows smoothly without sputtering.
3. 3Flush every toilet twice.
4. 4Run the dishwasher and washing machine through one cycle. Most trapped air clears within 24 hours of normal use.

2. Clogged Aerator

The aerator is the little mesh screen at the tip of the faucet. It mixes air into the water to reduce splashing. Over time, mineral deposits and debris collect in it and disrupt the water stream, making the faucet sputter or spray sideways.

1. 1Unscrew the aerator by hand. If it is stuck, use pliers wrapped in a rag to avoid scratching the metal.
2. 2Disassemble it (washer, screen, restrictor) and rinse under hot water.
3. 3If buildup is heavy, soak the parts in white vinegar for 30 minutes, then scrub with an old toothbrush.
4. 4Reassemble in the same order and screw back on. Test the flow. Smooth = done.

3. Worn Cartridge or Washer

Inside a single-handle faucet is a cartridge that controls flow and temperature. In a two-handle faucet, each side has a rubber washer. When either wears out, water can drip past unevenly, pulling air in with it and causing sputtering.

1. 1Shut off the water at the valves under the sink.
2. 2Pop the decorative cap off the handle and unscrew it. Remove the handle.
3. 3Pull out the cartridge straight up (or unscrew the washer assembly). Take it to the hardware store to match.
4. 4Replace with the matching part ($8-25 depending on brand). Moen, Delta, Kohler have brand-specific cartridges.
5. 5Reassemble in reverse order. Turn water back on and test.

4. Water Heater Issue (Hot-Only Spitting)

If spitting only happens with hot water, the problem is upstream. Either the water heater is overheating and producing steam, or sediment in the tank is releasing air bubbles. Both need attention.

1. 1Check the temperature setting on the water heater. Should be 120-130 degrees Fahrenheit. Anything above 140 can flash to steam.
2. 2Listen at the tank for popping or rumbling sounds. That is sediment hitting the heating element.
3. 3Drain and flush the tank: shut off the heater, attach a hose to the drain valve, let it run until water is clear.
4. 4If the heater is gas and the spitting continues, the temperature-pressure relief valve might be failing. Call a plumber.

5. Pinhole Leak in the Supply Line

A small leak in the pipe between the water main and your faucet lets air in along with the water. You may not even see the leak if it is behind a wall or under the slab, but the air shows up at the faucet.

1. 1Look for water stains on ceilings below the affected room, soft spots in drywall, or unexplained damp areas in the basement.
2. 2Check the water meter when no water is in use. If it spins, there is a leak somewhere in the system.
3. 3Hire a leak detection service ($150-300). They use acoustic or thermal tools to find hidden leaks without tearing walls apart.
4. 4This is not a DIY repair past the diagnosis. Once located, a plumber patches or replaces the affected section.