My Water Pressure Is Low

When the shower dribbles instead of sprays and faucets take forever to fill a pot, low water pressure makes everything harder. The fix depends on whether this is affecting the whole house or just one fixture — and whether it happened suddenly or gradually.

Quick Diagnosis (30-Second Checks)

1. One fixture or many? Test multiple faucets and showers. If only one fixture is affected, the problem is local to that fixture. If the whole house is low, the problem is in the supply.
2. Hot, cold, or both? If only hot water is low pressure, the problem is between the water heater and the fixture (or the water heater itself).
3. Did it happen suddenly or gradually? Sudden = something changed (valve, main break, PRV). Gradual = buildup or corrosion.
4. Ask your neighbors. If they're also experiencing low pressure, it's a municipal supply issue — call your water company.

Common Causes (Ranked by Likelihood)

1. Clogged Aerator (Single Fixture)

The aerator is the small screen at the tip of your faucet. Mineral deposits, sediment, and debris clog it over time, reducing flow. This is the most common cause of low pressure at a single faucet.

Fix: Unscrew the aerator (by hand or with pliers wrapped in tape to avoid scratching). Soak it in white vinegar for a few hours to dissolve mineral deposits. Rinse and reinstall. If it's badly corroded, replace it ($3-$8). Time: 5 minutes.

2. Shut-Off Valve Not Fully Open

There are two main shut-off valves: the one at the meter (street-side) and the main house valve (where the water line enters your home). Either one being partially closed dramatically reduces pressure throughout the house.

Signs: Sudden pressure drop, especially after recent plumbing work (a plumber may have closed and not fully reopened a valve).

Fix: Locate both valves and ensure they're fully open. Gate valves (round handle) should be turned fully counterclockwise. Ball valves (lever handle) should have the handle parallel to the pipe. This is free and takes 2 minutes.

3. Pressure Reducing Valve (PRV) Failure

Most homes have a PRV (a bell-shaped brass device on the main water line near where it enters the house). It reduces the municipal supply pressure (which can be 80-150 PSI) to a safe household level (40-60 PSI). When the PRV fails, it may restrict pressure too much.

Signs: Gradual pressure decline throughout the house. No change when you open valves fully. PRV is old and has never been serviced.

Fix: PRV replacement costs $200-$500 installed. Lifespan is typically 10-15 years. Some PRVs have an adjustment screw (clockwise to increase pressure), but if the internal parts are worn, adjustment won't help.

4. Corroded or Galvanized Pipes

Homes built before the 1970s often have galvanized steel pipes. Over decades, the interior corrodes and narrows, restricting flow. This gets progressively worse and eventually requires repiping.

Signs: Gradual decline over years. Rusty or discolored water when you first turn on faucets. Older home with original plumbing. Pressure worse at fixtures farthest from the main.

Fix: Repiping the house with copper or PEX. This is a major project: $4,000-$15,000 depending on house size and accessibility. But it's a permanent fix and adds value.

5. Water Main Issue

If the municipal supply has a problem — a main break, scheduled maintenance, or simply aging infrastructure — your pressure will suffer regardless of your home's plumbing.

Signs: Affects the whole neighborhood. Started suddenly. May coincide with utility work in the area.

Fix: Contact your water utility. Check their website or social media for service alerts. This is their problem to fix.

6. Leak in the Supply Line

A leak in the pipe between the meter and your house (or within the house) can reduce pressure. An underground leak may not be visible.

Signs: Water bill is higher than normal. Wet spots in the yard between the meter and house. Pressure drops are intermittent.

Fix: A plumber can pressure test the line and locate the leak. Underground supply line repair: $500-$2,500.

7. Clogged Showerhead (Single Fixture)

Similar to aerator buildup, showerheads accumulate mineral deposits that restrict flow.

Fix: Remove the showerhead and soak in vinegar overnight. Or fill a plastic bag with vinegar, rubber-band it over the showerhead in place, and let it soak. Rinse thoroughly. Time: 5 minutes active work.

DIY Fixes

• Clean or replace faucet aerators
• Soak showerheads in vinegar to dissolve mineral buildup
• Check and fully open the main house shut-off valve
• Check and fully open the meter shut-off valve (if accessible)
• Check individual fixture shut-off valves (under sinks, behind toilets)
• If you have a PRV with an adjustment screw, try a quarter-turn clockwise (don't exceed 60 PSI — use a hose bib gauge to check, $10 at hardware stores)

When to Call a Pro

• PRV needs replacement — requires cutting into the main line
• Galvanized pipes — repiping is a professional job
• Underground supply line leak — excavation and repair needed
• Pressure drops to zero — could indicate a break or valve failure
• Pressure is above 80 PSI after PRV adjustment — too high damages fixtures and can cause pipe failures
• Hot water pressure only is low — may indicate water heater or recirculation pump issue

Pro Detail

Diagnostic Procedures

1. Measure static pressure — Attach a gauge to an exterior hose bib (closest to the meter, no water running). Normal range: 40-60 PSI. Below 40 PSI indicates a supply issue or PRV problem.
2. Compare static vs dynamic pressure — If static is normal but pressure drops significantly when a faucet is opened, there's a restriction in the piping (corrosion, undersized pipe, partially closed valve).
3. Isolate sections — Close valves to isolate portions of the system and test each section independently.
4. Flow rate test — Measure flow in gallons per minute at fixtures. Minimum code: 2 GPM for showers, 1.5 GPM for faucets.
5. Visual pipe inspection — Cut a test section of galvanized pipe to check for internal corrosion/buildup.

Prevention

• Test water pressure annually with a hose bib gauge ($10 from any hardware store)
• Clean aerators and showerheads every 6-12 months (more often in hard water areas)
• Service or replace PRV every 10-15 years
• Install a whole-house water softener in hard water areas to reduce mineral buildup
• Know the age and material of your pipes — plan for repiping before an emergency

Cost Guide

| Service | Typical Cost | Notes | |---------|-------------|-------| | Aerator cleaning/replacement | $0-$8 | DIY | | Showerhead cleaning | $0 | DIY (vinegar soak) | | PRV replacement | $200-$500 | Installed | | Pressure gauge (hose bib) | $10 | DIY diagnostic tool | | Supply line repair | $500-$2,500 | Underground or in-wall | | Whole house repipe (copper) | $5,000-$15,000 | Depends on size | | Whole house repipe (PEX) | $4,000-$10,000 | Less expensive than copper | | Water softener installation | $1,000-$3,000 | Including equipment |

Shipshape Integration

SAM monitors water pressure to catch problems before they become disruptions:

• Pressure monitoring detects gradual decline that indicates PRV wear or pipe corrosion developing
• Water usage tracking identifies leaks that can cause pressure drops
• Maintenance reminders for PRV service, aerator cleaning, and softener salt
• Pipe material and age tracking — SAM knows when your plumbing is approaching its expected lifespan
• Dealer coordination for repiping consultations and PRV replacement scheduling