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What causes low water pressure in Las Vegas homes?

Curb pressure in Las Vegas runs 70 to 110 PSI. Most home pressure issues trace to a failing PRV, scaled fixtures, or a leak somewhere in the supply, and the diagnostic order matters.

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Quick answer
  • Las Vegas municipal water arrives at the curb at 70 to 110 PSI; a failing pressure reducing valve is the most common cause of low pressure.
  • Aerator and showerhead scaling from 280+ ppm hard water restricts flow at individual fixtures while the rest of the house runs normally.
  • Slab leaks and supply line corrosion drop pressure system-wide and require diagnostic, not just fixture cleaning.
  • Older homes with original galvanized supply lines have permanently narrowed interior diameters from decades of mineral and rust buildup.
  • A simple PSI gauge on a hose bib will tell you in 30 seconds whether the issue is at the home or at a single fixture.
Section 01

Start at the pressure reducing valve

Las Vegas municipal water arrives at residential meters at pressures that vary by elevation and neighborhood but typically fall between 70 and 110 PSI, with some higher-elevation Henderson and Summerlin neighborhoods running above 100 consistently. That is significantly higher than what residential fixtures, water heaters, and supply lines are designed for, which is why almost every home in the valley has a pressure reducing valve, or PRV, installed just downstream of the main shutoff. The PRV's job is to step incoming pressure down to a working level in the 55 to 70 PSI range, where fixtures, water heater tanks, dishwasher solenoids, and washing machine valves are all rated to live their full lifespan. A failing PRV is the single most common cause of system-wide pressure complaints we respond to in Las Vegas homes, and it is also one of the cheapest things to test. With a standard pressure gauge screwed onto a hose bib, a homeowner can read static pressure at the home in under a minute. If the reading is below 45 PSI, the PRV is failing closed and choking flow. If the reading is above 80 PSI, the PRV is failing open and not regulating at all, which is its own problem because high pressure damages fixtures, ice makers, and water heater tanks upstream of the actual symptom. Either reading points to PRV service or replacement, typically a 30 to 60 minute job and a part cost of one to three hundred dollars depending on the valve specification and the access at the main.

Section 02

When the problem is at one fixture only

If pressure is fine at most of the house but low at one fixture, the cause is almost always local, not system-wide. The most common culprit is mineral buildup inside aerators and showerheads from Las Vegas's 280+ ppm hard water. The aerator on a kitchen or bathroom faucet is a small mesh screen that mixes air with water to create a steady, even stream; calcium scale will completely clog one in 12 to 24 months on raw municipal water. Unscrew the aerator, soak it in white vinegar for an hour, and reinstall. Showerheads scale up the same way and respond to the same treatment, though a heavily scaled head is often cheaper to replace than to clean. Angle stops, the small shutoff valves under sinks and behind toilets, are the next most common single-fixture cause. They scale shut over time and reduce flow even when fully open. A failing toilet fill valve creates a slow-fill problem that looks like a pressure issue but is actually a metering problem inside the toilet tank. If pressure is low at every hot tap but normal at every cold tap, the issue is the water heater itself: either a partially closed inlet shutoff, sediment buildup at the dip tube area, or a failing dip tube depositing plastic shards into the hot lines. Knowing which symptom pattern matches your house turns a system-wide diagnostic into a 10 minute fix, and we routinely talk customers through these checks over the phone before they need a service call.

Section 03

System-wide pressure loss diagnostics

When pressure is low everywhere in the home, after the PRV has been verified as working correctly, the next category of cause is supply-line restriction or a system leak. A slab leak, even a small one, bleeds enough flow off the supply to drop usable pressure measurably at every fixture. Confirming this is the leak indicator on the water meter; if it moves with every fixture off, the system is leaking. Galvanized supply lines from older 1950s through 1970s homes corrode and scale internally to the point where a half-inch line has an effective inside diameter of three-eighths or less, and there is no fixing it short of repipe. Copper lines do not lose flow capacity to the same degree but can develop calcium scale inside if the home has never had a softener and the water has been raw municipal feed for decades. The main shutoff valve at the home itself can fail partially closed, especially older gate valves that have not been operated in years. Pulling the handle to full open is the first thing to verify; if the symptom shifts, the valve is the cause. Finally, the meter itself can occasionally be the limit, particularly in older central Las Vegas homes with five-eighths-inch service taps that were appropriate for the original 2 bathroom build but undersized for a remodel that added a master suite and an outdoor kitchen. The Las Vegas Valley Water District can upsize a meter on request when this is the documented cause.

When to call us

The next step.

If your pressure has dropped across the whole house, your PRV gauge reads outside the 55 to 70 PSI window, or you are seeing a hot-only or fixture-only pattern that does not respond to cleaning, JMAC's plumbing side will diagnose it in one visit. We have been working on Las Vegas pressure issues for 30 years and we know the neighborhood patterns: where PRVs typically fail, where galvanized is still in the walls, where the meter taps are undersized. The free second opinion offer applies to any pressure-related quote you have already received elsewhere.

Book a Free 2nd Opinion702-227-5622
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