Troubleshooting
Air in Your Well Water Lines: Why Faucets Sputter and Spit
Air doesn't get into a pressurized house system by itself. It comes in from the well side — and when it shows up tells you where.
On this page
Faucets spit air on a well system for four main reasons: the water level is dropping to the pump's intake during heavy use, a jet pump's suction line is leaking air, the pipe is partly draining between pump cycles (a leaking check valve or drop pipe), or the water itself contains dissolved gas. Note when it happens — after long water use, first thing after the pump rests, or all the time — and you'll know which one to chase.
Start with the timing
| When it happens | Most likely cause | Next step |
|---|---|---|
| After long use (irrigation, laundry day, several showers) | The pump is drawing the water down to its intake — over-pumping the well | Spread out water use; have the water level measured |
| A burst at the first faucet after the pump has been idle, then clear | Part of the pipe drained between cycles: leaking check valve, foot valve or drop pipe | Check valve pressure-hold test |
| Constantly, whenever the pump runs (jet pump) | Air leak on the suction side | Soapy-water check of suction joints (below) |
| Constantly, with milky water that clears from the bottom up | Dissolved gas in the groundwater | Laboratory test for gases |
| Once, right after plumbing work or a filter change | Trapped air from the repair | Run cold taps until clear; no action needed |
| Only at hot-water taps | The water heater, not the well | Plumber or water-heater service |
What the manufacturers list
Pentair's jet-pump manual has a troubleshooting entry for exactly this symptom — "air spurts from faucets" — with four causes: the pump is still picking up prime, a leak on the suction side, a "gaseous" well, and intermittent over-pumping of the well (water drawn down below the foot valve).[1] For submersible pumps, Franklin Electric's guidance for a low water level is to shut the pump off, let the well recover, and have the static and drawdown levels checked, then throttle the pump's output or set it lower.[2]
The causes in detail
1. Water level falling to the intake
- Symptoms
- Sputtering after heavy use; pressure sags at the same time; worse in late summer or drought; clears after the well rests.
- What sets it apart
- It tracks how much water you've just used.
- Safe checks
- Keep a simple log: date, what was running, how long before it sputtered. Stop irrigation and see if it goes away.
- Don't
- Don't keep running the pump while it pulls air — pumps rely on water for cooling. Don't install a larger pump; it draws the level down faster.
- Likely fix
- Pentair's remedy for jet pumps: lower the foot valve if possible, otherwise restrict the pump's discharge.[1] For submersibles: a flow restrictor, a lower pump setting, storage, or pump protection that shuts off on low water — a well contractor's call after measuring.
2. Suction leak (jet pumps)
- Symptoms
- Air whenever the pump runs; the pump may also lose prime; you may hear a hiss at a fitting.
- What sets it apart
- Only jet pumps have a suction line under vacuum, so only they can pull air in through a loose joint.
- Safe checks
- Pentair's method: check the suction-side joints for leaks with soapy water.[1] With the pump running, a leak draws the suds in.
- Don't
- Don't touch the motor while it runs; Pentair notes pump motors run hot and should cool 20 minutes before handling.[1]
- Likely fix
- Reseal or replace the fitting or section of suction pipe. See jet pump loses prime.
3. Pipe draining between cycles
- Symptoms
- A spit of air at the first draw after the pump has rested; sometimes a bang when the pump starts.
- What sets it apart
- It's worst after idle periods and clears within seconds.
- Safe checks
- The pressure-hold test.
- Don't
- Don't ignore a bang at start-up. Franklin says water hammer can split pipes and damage the pump or motor.[2]
- Likely fix
- Check valve, foot valve or drop pipe repair.
4. Gas dissolved in the groundwater
- Symptoms
- Fizzy or milky water that clears in a glass from the bottom up; sputtering even when the pump and water level are fine; sometimes a gurgling sound at the well.
- What sets it apart
- It doesn't depend on how much water you use.
- Why it matters
- Penn State Extension notes that a gurgling noise from a well can be a sign of gas, and that while methane is not toxic in drinking water, at elevated concentrations it can escape from water quickly and create an explosion hazard in poorly ventilated or confined spaces.[3]
- Safe checks
- Don't try to test for gas with a flame. Have the water tested by an accredited laboratory; Penn State advises that methane samples be collected by lab personnel.[3] Your state or county health department can point you to labs.
- Likely fix
- Depends on the gas and the concentration: venting the well, aeration or other treatment, designed by a water-treatment professional. Penn State's guidance treats methane below 10 mg/L as generally safe, 10–28 mg/L as a level to monitor, and above 28 mg/L as needing immediate action.[3]
When to call a professional
- Sputtering comes with sandy, muddy or cloudy water that doesn't clear.
- It happens every time you use a lot of water.
- You suspect gas, or anyone notices an unusual smell near the well, pressure tank or basement.
- There's a bang when the pump starts.
Sources
- Pentair. Pro Shallow Well Jet Pumps — Installation & Operation Manual (P15001, 2023). Accessed Sept. 28, 2026.
- Franklin Electric. Submersible Motors: Application, Installation & Maintenance (AIM) Manual, 60 Hz. Accessed Sept. 28, 2026.
- Penn State Extension. Methane Gas and Its Removal from Water Wells — Bryan R. Swistock and Dana Flowers (updated Aug. 26, 2022). Accessed Oct. 8, 2026.
We cite manufacturer documentation and public agencies first. Read how we choose and check sources.