Water Pressure Services We Handle
- Water pressure testing at the hose bib, washing machine connection, or main line
- Pressure-reducing valve (PRV) inspection, adjustment, and replacement
- Diagnosis of pipe corrosion, sediment, and clogs affecting flow
- Whole-home repiping when old galvanized lines are restricting flow
- Water heater flushing when sediment buildup is dragging down hot water pressure
Signs You Have a Pressure Problem
- Weak flow at the faucets or a shower that feels underpowered — signs of low pressure
- Water spraying from fixtures or fittings, or banging noises in the walls — signs pressure is running too high
- Frequent leaks or unexplained water damage, which high pressure accelerates over time
- Pressure that swings up and down without you touching a tap
- A noticeably higher water bill with no change in usage, which can point to a hidden leak
What Normal Pressure Looks Like
Most residential systems run best between 40 and 60 psi. Above that range, pipes, fittings, and appliances take on more stress than they're built for — water heaters, dishwashers, and washing machines all have pressure limits, and running much above that range shortens their life. Below 40 psi, everyday tasks like showering or running the dishwasher get noticeably harder.
What Causes High or Low Pressure
- Pipe issues. Older galvanized pipe corrodes and narrows from the inside, and sediment or debris can build up enough to restrict flow. In severe cases, repiping is the only real fix.
- A failing PRV. A pressure-reducing valve that's stuck or wearing out can let pressure climb too high, or restrict it more than it should.
- A bad shutoff or other valve. A valve that isn't fully open, or one that's failing, causes inconsistent flow throughout the house.
- Water heater sediment. A tank with heavy sediment buildup restricts hot water flow specifically, even when cold water pressure tests normal.
Adjusting the PRV
If your home has a pressure-reducing valve — usually located near where the main line enters the house — adjusting it means turning the screw on top clockwise to raise pressure or counterclockwise to lower it, then rechecking with a gauge after every turn. A pressure gauge attached to an outdoor hose bib or washing machine connection gives an accurate reading of what's actually reaching your fixtures; guessing from how a shower feels isn't reliable enough to act on. If there's no PRV installed, or adjustments aren't holding, that's usually a sign the valve itself needs replacing rather than more adjustment.
Common Mistakes Homeowners Make Adjusting Pressure
Turning the screw too far in one move and not rechecking with a gauge afterward is the most common error — it's easy to overshoot and push pressure past a safe range without realizing it until something leaks. Over-tightening the valve itself can also cause leaks or, in worse cases, damage that leads to a pipe failure down the line. Adjustments should happen gradually, with a pressure check after each turn, and if pressure won't stabilize in the normal range, that's the signal to call a plumber rather than keep adjusting.
What Ignoring a Pressure Problem Costs You
High pressure that goes unaddressed puts ongoing stress on every fitting, appliance, and seal in the house, and it's a common contributor to pipe bursts and premature appliance failure. Low pressure is more of a daily annoyance than a structural risk, but it's often a symptom of a bigger issue — a hidden leak, failing pipe, or a valve that isn't fully open — that gets more expensive to fix the longer it goes unchecked.
When Repiping Is the Real Fix
Older homes across the Treasure Valley still have sections of galvanized steel pipe, and that material corrodes and narrows from the inside over decades — adjusting the PRV won't fix pressure loss caused by pipe that's physically restricted. If pressure testing traces the problem to corroded or undersized pipe rather than the PRV or a valve, repiping the affected section is the fix that actually holds, instead of chasing symptoms with repeated valve adjustments that never quite solve it.
DIY Testing vs. Calling a Plumber
Checking pressure with a gauge at an outdoor hose bib is something most homeowners can do themselves, and it's worth doing before calling anyone — it tells you whether the problem is even a pressure issue versus a clog at a single fixture. Adjusting a PRV is also within reach for a comfortable DIYer, as long as you recheck with the gauge after every small turn. Where it's time to call a plumber: no PRV installed and pressure is still out of range, adjustments that won't hold, or any sign of a leak alongside the pressure problem — those point to something a valve adjustment can't fix.
Treasure Valley Water Pressure Service
We test and adjust water pressure across Caldwell, Boise, Meridian, Nampa, and the rest of the Treasure Valley from our shop on Commercial Way in Caldwell.
Call (208) 366-5771 and a real person answers — no phone tree, no call center. Family-owned, veteran-owned, and Treasure Valley-based since day one. Same-day service when you call early.
Frequently asked questions
Why is water pressure testing important?
Water pressure is the force at which water moves through the pipes and into fixtures like faucets, showers, and appliances. High water pressure puts extra stress on pipes and fixtures and can lead to leaks and water damage, while low water pressure results in insufficient flow that affects everyday tasks like washing dishes or showering. Regular testing helps confirm the plumbing system is operating at a safe, efficient pressure before either extreme causes damage.
How often should I have my water pressure tested?
It's recommended to test water pressure at least once a year. Testing should happen more often if there are noticeable changes in water flow or pressure fluctuations, and it's also a good idea after new plumbing installations, repiping projects, or when moving into a new home.
What signs indicate I might have a water pressure problem?
A weak flow at the faucets or a shower that feels less powerful than it should are signs of low water pressure. Water spraying from fixtures or unusual noises like banging pipes can point to high water pressure instead. Frequent leaks or water damage are also reasons to have the pressure checked before the underlying issue gets worse.
What is considered normal water pressure for a home?
Optimal water pressure for a residential plumbing system typically falls between 40 and 60 psi. If a measurement comes in higher than that range, the pressure-reducing valve near where the water line enters the home can usually be adjusted to bring it back down, though a licensed plumber should be consulted if there's no pressure-reducing valve or the problem doesn't resolve.
What can cause high or low water pressure in my home?
Older plumbing often suffers from corrosion that narrows the pipes, and clogs from sediment buildup or foreign objects can also restrict flow, both leading to low pressure. Valve problems play a role too: a malfunctioning pressure-reducing valve can cause high pressure, while a faulty shut-off valve can cause inconsistent flow. A water heater with sediment buildup or other issues can also restrict hot water flow and lower pressure at fixtures that rely on it.
