Symptoms
- Faucet spits or sputters before flowing normally
- Started right after plumbing work, a water shutoff, or low water pressure event
- Both hot and cold sputter, or just one side
- Sputtering fades after running the tap for a bit
Likely causes
- CommonAir trapped in the pipes after a shutoff or repairAir pockets get pushed out gradually as water is run through the system.
- PossibleWater heater air pocket (hot side only)Air can accumulate in the tank after draining or a power outage.
- PossibleWell pump losing prime (well water systems)A well system with intermittent air suggests a pump or pressure tank issue.
- Less commonLow water level in the municipal system during work nearbyCan briefly introduce air into home plumbing.
What to do
- Run the affected faucet at full flow for several minutes to let trapped air work its way out.
- Run other faucets in the house briefly too, since air pockets can be spread through the system.
- If it's hot-side only, check the water heater relief valve area and give it time to clear as well.
- If sputtering continues after running water for a while, and you're on a well, check the pressure tank gauge and pump cycling.
- If sputtering is a new, recurring problem with no recent plumbing work, keep an eye on the water pressure overall.
- Persisting sputtering after a day or two of normal use is worth mentioning to a plumber.
When to call a pro
Call a plumber if sputtering continues for more than a day or two, or if you're on a well and suspect a pump or pressure tank problem.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.