You turn on the kitchen faucet to fill a pot, and instead of the strong stream you are used to, you get a sad trickle. Or maybe the shower that woke you up every morning for years now feels more like a light rain. Sudden water pressure drops are one of the most common plumbing complaints we hear from Treasure Valley homeowners, and the cause can range from a five-minute fix to a buried problem that has been quietly getting worse for months.
The first thing to figure out is whether the drop is affecting one fixture or the whole house. That single question narrows the diagnosis dramatically, and it is the same question we ask when a customer in Boise, Meridian, or Nampa calls us about pressure problems.
When It Is Just One Fixture
If only the kitchen sink, one bathroom, or a single shower head has lost pressure, the problem is almost always local to that fixture. The most common culprit is a clogged aerator, which is the little mesh screen threaded onto the end of most faucets. Treasure Valley water is hard enough that mineral scale, sediment, and the occasional flake of corroded pipe will pack into that screen over time and choke off the flow. Unscrewing it, soaking it in vinegar overnight, and rinsing it out solves the problem more often than people expect.
Shower heads suffer the same fate, and the fix is identical. If the aerator or shower head is clear but the pressure is still weak, the next suspect is the shutoff valve under the sink or behind the wall, which can get partially closed by accident or seize up over time. A failing cartridge inside a single-handle faucet can also restrict flow without any obvious symptoms.
When the Whole House Lost Pressure
This is where things get more interesting. If every fixture in the house dropped at once, the issue is somewhere upstream, in the lines that feed the entire home. There are a handful of likely causes.
The first to check is the pressure regulator, also called a PRV. Most Boise-area homes have one installed where the main water line enters the house. Its job is to step the high municipal supply pressure down to a safe level for residential plumbing. When a PRV fails, it usually fails in one of two directions: either pressure climbs uncomfortably high, or it crashes. A failing regulator is one of the most common whole-house pressure complaints we see, and the fix is straightforward once it is diagnosed.
A second possibility is a hidden leak somewhere in the supply line. A leak large enough to drop your house pressure is also large enough to do real damage, whether it is under a slab, in the yard between the meter and the house, or inside a wall. If your pressure dropped and your most recent water bill spiked, that is a strong signal.
Aging galvanized pipes are a third cause, especially in older North End, Boise Bench, and downtown homes. Galvanized steel corrodes from the inside out, slowly choking off the interior diameter of the pipe until the flow can no longer keep up. There is no spot fix for this. Once galvanized lines reach that stage, a whole home repipe is the only real solution. We currently have a 5% off whole home repipe special running, which makes a job like this more manageable for homeowners who have been putting it off.
If You Are on a Well
Homes outside the city limits running on private wells have their own short list of pressure suspects. A waterlogged pressure tank, a failing pressure switch, or a well pump that is on its last legs will all show up as a sudden whole-house pressure drop. Short-cycling, where the pump kicks on and off rapidly every time you open a tap, is a common warning sign. Our team handles well pump and pressure tank service throughout the area, and these issues tend to be much cheaper to address before the pump fails completely.
What To Do Right Now
If the drop is affecting one fixture, start with the aerator or shower head and see if a quick clean solves it. If the whole house is affected, check around the water meter and along the main line for any visible wet spots or sinking ground, and take a look at your most recent water bill for unusual spikes. Then give us a call. Diagnosing a pressure problem properly takes the right gauges and a tech who has seen the failure pattern before, and guessing wrong can mean replacing parts that were never the issue.
Call (208) 362-6200 or request service online to get a Drake technician out for a proper diagnosis. We will figure out what is actually causing the drop and walk you through the fix without pressure to upsize the job. Fast. Friendly. Fixed. Just Drake it.
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