No water after pressure change

Quick Answer:

If your water went quiet after the utility changed pressure, first check indoor taps to see if pressure is down everywhere. Often the problem is trapped air, an isolation valve left partly closed, or a pressure regulator/check valve that reacted to the change. These steps will help you identify whether you can safely restore flow or whether you need the utility or a plumber. See related situations like No water after city outage or No water after turning main back on for other causes and actions.

Why This Happens

When the utility adjusts supply pressure, internal valves and regulators in your service line can move or close. That can leave pockets of air trapped in exterior lines or cause a pressure regulator (PRV) or check valve to stick. A stuck or damaged regulator can block flow to the house or to exterior feeds. A partly closed isolation valve that feeds the exterior can trap air and prevent water from reaching outside spigots until it is slowly bled out.

Step-by-Step What to Do

1. Check indoor taps for overall pressure

• Open a couple of indoor cold taps (kitchen and bathroom) and note whether pressure is reduced at all fixtures or only outside.
• If pressure is normal inside but no flow outside, the issue is likely confined to the exterior feed, isolation valve, or backflow/check valve serving outside lines.

2. Inspect the pressure regulator and meter from safe positions

• Look at the meter box and regulator for visible damage, leaks, or a stuck relief. Do not force or dismantle any meter or regulator fittings.
• If you see water spewing from a relief or a torn component, stop and call the utility or a plumber immediately.

3. Ask the utility to confirm outlet pressure at the meter

• Call your water provider and ask them to check the outlet pressure on their side of the meter. This tells you whether the issue is upstream (utility side) or downstream (your plumbing/regulator).
• Provide them clear observations: which fixtures are affected, any visible leaks, and whether the regulator or meter shows obvious damage.

4. Slowly reopen any isolation feeding the exterior to flush trapped air

• If an exterior isolation valve was shut during the pressure work, open it slowly—quarter turns with pauses—to let air and trapped debris escape without hammering the pipes.
• Start by opening an exterior tap slightly to allow a controlled bleed while you open the isolation. This helps push trapped air out without surging the system.

5. Look for pressure relief valve activity

• Some systems have a relief or bypass near the regulator that will vent if pressure spikes. Watch for dripping or venting at that point; it can indicate a regulator issue.
• Note the activity and report it to the utility or plumber—don’t try to adjust or block a relief device yourself.

What Not to Do

• Do not repeatedly cycle fixtures (turning taps on and off quickly) to chase pressure. That can force debris into regulators or create more air pockets.
• Do not adjust the pressure regulator yourself without guidance. Incorrect regulator adjustments can damage plumbing or create unsafe pressures.
• If multiple indoor fixtures show low pressure or you suspect the regulator or check valve is damaged, call a professional rather than continuing DIY attempts.

When to Call a Professional

Contact a licensed plumber or the utility if:

• Pressure is low at multiple indoor fixtures (not just outside). This suggests a regulator or main supply issue.
• You see active leaks, water spraying from the meter box, or relief valve discharge.
• The utility confirms normal outlet pressure at the meter but you still have no flow—this points to a problem on your side that may require a plumber to inspect the regulator, check valve, or buried exterior valve.

Safety Notes

• Never try to remove or tamper with the utility meter or any sealed fittings. The meter and its immediate fittings are utility property in many areas.
• Avoid working alone in traffic areas or wet, slippery meter pits. If the meter box is in the street, wait for the utility or a professional.
• If you smell gas or see electrical hazards near the meter, leave the area and call the appropriate emergency services—do not continue plumbing work.

Common Homeowner Questions

• Is this an emergency? If water is off to the whole house or you see active leaks or damage, treat it as urgent and call the utility or a plumber.
• Can I fix a failed pressure regulator myself? Minor adjustments should only be done by someone experienced; if you suspect failure, hire a licensed plumber.
• Will trapped air damage pipes? Trapped air alone usually won’t burst pipes, but pressure spikes and water hammer can harm fittings and appliances, so avoid abrupt cycling of valves.

More in this topic

For more related fixes and similar symptoms, see No Water at Exterior Faucets.