Why Is My Water Pressure Low?
Low water pressure is one of the most common plumbing complaints across Bountiful and South Davis County. The cause is almost always one of three things: corroded supply lines, a failing pressure-reducing valve, or hard water mineral buildup. Here is how to diagnose which one you have — and what to do about it.
How to Tell If Your Water Pressure Is Actually Low
Before troubleshooting causes, confirm the problem is genuine low pressure — not just a clogged aerator or a partially closed shutoff valve. Here is a fast field test any Bountiful homeowner can perform:
Kitchen Faucet Flow Test
Remove the faucet aerator, open the cold water valve fully, and fill a 1-gallon container. A healthy residential line delivers 2.0 to 2.5 gallons per minute (GPM). If it takes longer than 30 seconds to fill one gallon, your supply pressure is below the acceptable threshold.
Multiple Fixtures Affected
If only one faucet is weak, the problem is likely a clogged aerator or a local shutoff valve. If every fixture in the house is weak, the cause is systemic — on the main supply line.
Gradual vs. Sudden Loss
Gradual: Corroded pipes or mineral buildup slowly constricting flow over months. Sudden: A failed PRV, a burst pipe, or a municipal main break.
Hot Water Only?
Low hot water pressure with normal cold water indicates water heater mineral scale. It can also point to a restricted heater supply valve.
Gauge Test: 40–80 PSI Normal
Thread a hose bib pressure gauge onto an outdoor spigot. Below 40 PSI indicates a supply problem. Above 80 PSI means a failing PRV is letting dangerous municipal overpressure through.
Corroded & Rusted Supply Lines
Hundreds of Bountiful homes built before 1980 still run on original galvanized steel supply pipes. The zinc coating that protected these pipes from corrosion breaks down over 40–60 years, exposing raw steel to oxygenated culinary water.
The result is tuberculation — internal rust mounds that accumulate inside the pipe walls. A 3/4-inch supply line can constrict to an effective 1/8-inch opening. This throttles flow to a trickle whenever multiple fixtures run simultaneously.
checklist Warning Signs of Corroded Supply Lines
- arrow_rightReddish-brown or rusty water from the cold tap, especially first thing in the morning
- arrow_rightPressure drops dramatically when a second fixture opens (shower + kitchen)
- arrow_rightRust stains on porcelain sinks, toilet bowls, and laundry
- arrow_rightMetallic taste in the drinking water
- arrow_rightHome was built before 1980 with original galvanized plumbing
build The Engineering Solution
When galvanized pipes corrode past repair, spot patching redirects hydraulic stress to the next weakest point. The permanent solution is whole-home repiping with modern Uponor PEX-A expansion pipe. This corrosion-proof material provides 300% freeze expansion and a mirror-smooth interior that resists scale buildup.
build Learn About Whole-Home Repiping arrow_forward40–60
Year Galvanized Lifespan
85%+
Flow Loss in Severe Cases
dangerous PRV Jams Shut — Sudden Low Pressure
A worn rubber diaphragm or corroded spring inside the PRV can seize the valve in a partially closed or fully closed position. When this happens, the entire home loses pressure suddenly — every faucet, shower, and toilet fill valve runs at a trickle. This is the most common cause of sudden whole-house low water pressure in Bountiful.
emergency PRV Blows Open — Dangerous Over-Pressure
The opposite failure mode is equally dangerous. A ruptured PRV diaphragm stops regulating pressure entirely. It allows full municipal pressure (100–140 PSI along the Wasatch bench) to blast through the home. This overpressure causes water hammer, blows water heater T&P relief valves, and creates pinhole leaks.
Failing Pressure Reducing Valve (PRV)
Davis County storage tanks deliver municipal water at 100 to 140 PSI. This is far above the safe residential threshold of 50 to 65 PSI. The pressure-reducing valve (PRV), a brass regulator on your main water line, reduces incoming pressure to protect your plumbing.
PRV diaphragms wear out every 7 to 12 years. When they fail, your home either loses pressure entirely or receives dangerously high pressure — both requiring immediate professional diagnosis.
Hard Water Mineral Buildup
Bountiful and South Davis County culinary water contains 12 to 18 grains per gallon (GPG) of dissolved minerals. Water quality standards classify this Wasatch mountain aquifer supply as extremely hard.
As mineral-laden water flows through plumbing, calcium carbonate precipitates on pipes, valve seats, aerators, and cartridges. Over years, this accumulation physically narrows the pipe lumen, reducing flow capacity progressively. The buildup accelerates in hot water lines because minerals drop out of solution faster at higher temperatures.
Many Bountiful homeowners notice low pressure at kitchen faucets first. Narrow aerator screens clog with calcium flakes long before main supply lines become noticeably constricted.
water_drop The Cascade Effect
Hard water does not just reduce pressure. It triggers a cascade of plumbing damage:
shield The Preventative Solution
A properly sized demand-initiated metered water softener exchanges calcium and magnesium ions for sodium ions before the water enters your home's plumbing. This stops new scale formation entirely and allows existing light buildup to slowly dissolve.
water_drop Explore Water Softener Systems arrow_forwardHow to Identify Your Low Pressure Cause
Use these symptom patterns to narrow down which of the three causes is affecting your Bountiful home:
| Symptom Pattern | Corroded Pipes | Failed PRV | Mineral Buildup |
|---|---|---|---|
| Onset speed | Gradual (months/years) | Sudden (hours/days) | Gradual (months/years) |
| Fixtures affected | Whole house | Whole house | Starts at aerators, spreads |
| Water color | Rusty/brown (morning draw) | Clear | Clear, white flakes in aerator |
| Hot vs. cold | Both equally | Both equally | Hot water worse |
| Home age indicator | Pre-1980 galvanized | PRV older than 10 years | No softener installed |
| Gauge reading | Low (20–35 PSI) | Very low OR very high | Normal PSI, low GPM flow |
| Solution → | Whole-Home Repiping | Leak Detection & PRV | Water Softener System |
When Low Water Pressure Requires a Licensed Plumber
A clogged aerator is a simple homeowner fix. These warning signs are not — they indicate structural plumbing problems that require professional diagnosis and licensed repair.
Slab Moisture or Warm Flooring
Hot spots under vinyl or tile flooring indicate an under-slab copper supply line pinhole leak caused by corrosive local soils or mineral scale pitting.
Discolored or Rusty Water
Persistent brown, yellow, or rusty water — especially from the cold tap — signals advanced internal pipe corrosion that will not resolve without repiping.
Unexplained Utility Bill Spike
A water bill doubling without extra usage indicates a hidden leak. Potential sources include an under-slab pipe, a failed wall joint, or a running toilet.
Visible Pipe Corrosion
Green patina stains on copper joints, white calcium deposits on exposed pipe, or flaking galvanized sections in the basement indicate systemic corrosion.
Water Hammer & Pipe Banging
Violent banging when faucets shut off indicates a failed PRV. The valve allows 100+ PSI municipal pressure to stress pipe joints and appliance connections.
Ready for Diagnosis?
Our licensed master plumbers perform electronic pressure diagnostics, HD video pipe inspections, and thermal imaging to pinpoint the exact cause.
call Call (801) 798-5926Low Water Pressure Questions Answered
Expert answers from licensed Bountiful master plumbers on diagnosing and fixing water pressure problems.
Is low water pressure dangerous to my plumbing system? expand_more
Can hard water cause low water pressure in my Bountiful home? expand_more
How do I test my home water pressure without a plumber? expand_more
Why do I only have low water pressure on hot water? expand_more
What is a pressure-reducing valve (PRV) and does my Bountiful home have one? expand_more
Should I repipe my entire home or just fix the low-pressure section? expand_more
Services That Fix Low Water Pressure
Each of the three causes above requires a different licensed plumbing solution. Choose the service that matches your diagnosis:
Whole-Home Repiping
Replace corroded galvanized or polybutylene pipes with modern Uponor PEX-A. Restores full pressure and eliminates rust contamination permanently.
For Cause #1: Corroded Pipes
Leak Detection & PRV Testing
Electronic pressure diagnostics, acoustic listening, and thermal imaging to pinpoint PRV failures, hidden leaks, and slab line ruptures.
For Cause #2: Failing PRV
Water Softener Installation
Custom-sized demand-initiated softeners to neutralize Bountiful's 12–18 GPG hard water and prevent mineral scale buildup in your plumbing system.
For Cause #3: Mineral Buildup
Still Not Sure What Is Causing Your Low Water Pressure?
Our licensed master plumbers perform a comprehensive pressure audit. We test your PRV, inspect piping, check water hardness, and pinpoint the exact cause.