Start with the water meter and main shutoff valve

Low water pressure often starts at the meter or the main shutoff valve — the valve that controls water flow into your entire house. If either is partially closed, it restricts pressure throughout your home. Locate your water meter (usually in a basement, crawl space, or outside near the street) and look for a valve next to it. Turn it fully counterclockwise — it should move freely and stop on its own. Do the same for the main shutoff valve, which is typically near where the water line enters your house.

If the valve is stuck or will not turn, do not force it. A stuck valve often means mineral buildup inside, and forcing it can break the valve and create a bigger problem. In that case, call a plumber to replace it. If the valve turns easily and you see when ready improvement in pressure, the problem is solved. If not, move to the next step.

Key Takeaways

  • Check your main shutoff valve and water meter valve first — both should be fully open, and a partially closed valve is the fastest fix.
  • Sediment buildup in aerators and showerheads can cut pressure dramatically, and cleaning or replacing them costs almost nothing.
  • If pressure is low only in one room or fixture, the problem is local to that line; if it is low everywhere, the problem is in the main line or meter.
  • Pressure regulators wear out over time and can be replaced by a plumber for under $300 in most cases.
  • Leaks in the main line or supply pipes reduce pressure throughout the house and require professional repair.

Clean or replace aerators and showerheads

Aerators are the small screens at the end of faucet spouts. Showerheads have similar screens inside. Both collect sediment, mineral deposits, and debris that narrow the opening and reduce flow. This is one of the most common causes of low pressure and one of the easiest to fix.

Unscrew the aerator from the faucet (usually by hand, or with pliers if it is stuck). Rinse it under running water and use an old toothbrush to scrub away sediment. If the screen is heavily clogged or corroded, replace it — aerators cost $2 to $5 at any hardware store and come in standard sizes. For showerheads, unscrew the head from the arm, soak it in white vinegar for an hour to dissolve mineral buildup, then scrub and rinse. If cleaning does not restore pressure, replace the showerhead for $10 to $30.

Test each fixture after cleaning. If pressure improves at that one faucet or shower but remains low elsewhere, you have found a local problem. If pressure is still low everywhere, the issue is upstream in your main line.

Identify whether the problem is everywhere or in one location

Turn on every faucet, shower, and outdoor spigot in your house at the same time. If pressure drops at all of them, the problem is in your main water line or meter. If pressure is low in only one room, one bathroom, or one fixture, the problem is in the line serving that area.

For a single-location problem, check whether that line has its own shutoff valve (many do, especially for bathrooms). If it does, make sure it is fully open. If it is already open and pressure is still low, sediment may be clogging that specific line. A plumber can flush the line or replace the affected section, usually for $200 to $500.

For a whole-house problem, the cause is typically a failing pressure regulator, a partially closed main valve, sediment in the meter, or a leak in the main line. The next sections cover each.

Check the pressure regulator

A pressure regulator is a bell-shaped device usually located on the main water line just after the meter. It keeps water pressure from the street (which can be 60 to 80 pounds per square inch) at a safe level for your home's pipes (usually 40 to 60 psi). If the regulator fails, pressure either drops to almost nothing or spikes dangerously high.

Look for the regulator on your main line — it is often brass or gray metal and about the size of a fist. Some have a screw adjustment on top. If you see one, you can try a small adjustment: turn the screw clockwise one-quarter turn, wait a few minutes, and check pressure at a faucet. If pressure improves, stop. If it does not, turn it back and call a plumber. Do not guess at regulator adjustment — a wrong setting can damage your pipes or appliances.

A failing regulator usually needs replacement, not repair. A plumber can replace one for $150 to $300 in most cases. If you do not see a regulator on your main line, your house may not have one, which is common in older homes. In that case, pressure problems are more likely caused by a leak or sediment.

Look for leaks in the main line or supply pipes

A leak in the main water line reduces pressure throughout your house because water is escaping before it reaches your fixtures. Leaks are often hidden underground or inside walls, so you may not see water. The signs are a sudden drop in pressure, a wet spot in your yard or basement, a spike in your water bill, or the sound of running water when no faucet is on.

Check your water meter: turn off every faucet and appliance in your house, then look at the meter dial. If it is moving, water is leaking somewhere. If you see a wet spot in your yard, basement, or crawl space, or if you hear water running inside a wall, call a plumber when ready. Main line leaks require professional repair and can cost $500 to $2,500 depending on location and severity.

If you suspect a leak but see no obvious signs, a plumber can use a listening device to locate it. This diagnostic call usually costs $100 to $200 and is worth the cost if pressure has dropped suddenly.

Flush sediment from the water meter

Sediment can accumulate inside your water meter, narrowing the opening and reducing flow. This is more common in older homes or in areas with hard water. Flushing the meter is a job for a plumber, but it is straightforward and inexpensive — usually $100 to $200.

A plumber will shut off the main valve, disconnect the meter, and flush it with high-pressure water to clear sediment. If sediment is the problem, pressure usually improves when ready. If sediment returns quickly, it may indicate a problem upstream at the water main or treatment plant — in that case, your water provider should be notified.

Consider your water provider's pressure

Water pressure from the street varies by location, time of day, and demand. In some areas, street pressure is naturally low — 30 to 40 psi instead of the typical 50 to 60 psi. If you have ruled out all problems on your side of the meter (valves, aerators, regulator, leaks), low pressure may straightforward be what your water provider delivers.

Call your water provider and ask about typical pressure in your area. If street pressure is low, you have two options: install a pressure booster pump (which costs $1,000 to $3,000 installed) or accept lower pressure. A booster pump pulls water from the main line and pushes it through your home at higher pressure. It is a permanent solution but a significant investment.

Frequently Asked Questions

Why is my water pressure low only in the morning?

Morning pressure dips are common when many people in your neighborhood are using water at the same time. Pressure usually returns to normal by mid-morning. If low morning pressure is the only problem you have, it is not worth fixing. If pressure stays low all day, follow the steps above.

Can I increase water pressure by adjusting the pressure regulator myself?

You can try a small adjustment — turn the screw clockwise one-quarter turn and wait a few minutes to see if pressure improves. Do not make large adjustments. If one small turn does not help, stop and call a plumber. Wrong regulator settings can damage pipes and appliances.

How much does it cost to fix low water pressure?

Cleaning aerators costs nothing to $5. Replacing a pressure regulator runs $150 to $300. Flushing a meter costs $100 to $200. Repairing a main line leak can cost $500 to $2,500. Start with the free and cheap fixes first — valve adjustment and aerator cleaning — before paying for professional work.

What is normal water pressure for a house?

Normal household water pressure is 40 to 60 pounds per square inch (psi). Anything below 40 psi feels noticeably weak. Above 80 psi can damage pipes and appliances. If you want to measure your pressure, buy a pressure gauge at a hardware store for $10 to $20 and screw it onto an outdoor spigot.

Should I call a plumber or my water provider?

Call a plumber first if pressure is low only in your house. Call your water provider if pressure is low throughout your neighborhood or if you suspect a problem at the main. Your provider can tell you the street pressure and whether there is a known issue in your area.