Quick Answer:
If a spigot starts leaking after the water returns from a city outage, first open indoor faucets slowly to bleed air and reduce surge, then inspect the outdoor backflow and check valves for debris or damaged seals. Flush supply lines to remove grit and replace or service any valves that show debris damage or failed seating. If several fixtures leak or you see major damage, call a professional.
Why This Happens
When water service is shut off and then restored, air can be trapped in pipes and debris that settled while flow stopped can be pushed through as pressure resumes. Sudden pressure changes can force grit or small particles into valve seats, damage soft seals, or lift worn washers. That can make a previously tight spigot drip or spray. A brief surge can also expose existing weaknesses in older valves or check valves.
For homeowners who see trouble right after service returns, this is similar to a Leak after pressure change scenario: trapped air and moving debris are the usual culprits rather than an immediately failed pipe.
Step-by-Step What to Do
1. Open the main or indoor faucets slowly
- Start at a sink on the top floor and open one or two indoor faucets slowly to a steady stream — do not crank them full open.
- This lets air escape gradually and reduces the chance of a pressure surge that can push debris into outdoor fixtures.
2. Bleed air from outdoor spigots
- Once indoor faucets run smoothly and without sputtering, open the outdoor spigot slowly to let any trapped air and initial grit out. A slow start limits pressure shock.
- If your spigot has a hose attached, remove it first so grit can flush freely.
3. Inspect the backflow preventer and check valves
- Visually check the outdoor backflow device and any check valves for visible debris, bent parts, or damaged seals.
- If a check valve is making noise, leaking, or won’t seat, it may have grit or a damaged seal that needs cleaning or replacement.
4. Flush the supply lines
- After initial bleeding, run a strong flow from an indoor faucet for a minute or two to clear remaining grit from the line.
- Then run the outdoor spigot to flush out any remaining particles. Use a bucket to capture water if you’re concerned about runoff.
5. Replace or service any failing valves
- If the spigot still leaks after flushing, disassemble the spigot or backflow device per the manufacturer’s guidance and look for worn seats, torn washers, or embedded grit.
- Replace small parts like washers or seals if you are comfortable. If a valve seat or check valve shows debris damage or failed seating, plan to replace or have it serviced by a plumber.
If the leak appeared immediately after a recent plumbing service, consider that it may relate to that work — a situation similar to a Leak started after plumbing repair. Inspect connections and any parts the technician touched.
What Not to Do
- Avoid immediately cranking everything back to full pressure without flushing the system first — that can push debris into valves and cause or worsen leaks.
- Don’t ignore multiple leaks; if more than one fixture leaks after service restoration, don’t try to fix everything yourself without checking for underlying damage.
- Don’t force or hammer valves open if they stick — that can break parts and make repairs more difficult.
- Call a pro when you suspect a pressure surge caused damage or when multiple fixtures leak after service restoration.
When to Call a Professional
- Call a plumber if multiple fixtures leak, if a backflow preventer is damaged, or if a valve won’t seat after cleaning.
- If you see water spraying under pressure, hear continuous hammering noise, or find wet damage inside walls or under the house, get professional help right away.
- Professional service is also a good choice if you’re not comfortable disassembling outdoor valves or backflow devices yourself.
Safety Notes
- Turn off water at the main only if you need to stop a major leak; do not close it repeatedly as a routine step unless instructed by a pro.
- Wear gloves and eye protection when disassembling valves — grit and water can eject suddenly.
- If you detect any electrical hazards (e.g., water near outlets), shut power to the area and call an electrician or plumber immediately.
Common Homeowner Questions
- Q: How long should I run faucets to clear grit?
A: Run indoor faucets for a minute or two until the water runs clear, then flush outdoor spigots briefly. - Q: Can a pressure surge permanently damage a spigot?
A: Yes—surges can damage seals and seats; minor damage may be repaired, but severe damage may require valve replacement. - Q: Is it safe to replace a backflow preventer myself?
A: Only if you’re experienced and follow local codes; otherwise hire a licensed plumber, because backflow devices are regulated in many areas.
More in this topic
For more related fixes and similar symptoms, see Outdoor Spigot Leaks Under Load.