If you’ve noticed a decrease in water pressure throughout your home or at specific fixtures like your shower head or kitchen faucet, you’re not alone. As Kalispell’s trusted plumbing experts for 34 years, we’ve diagnosed and resolved countless water pressure issues for homeowners across the Flathead Valley. To help with your low flow woes, our plumbers have put together a list of the most common causes of low water pressure and their solutions.
Common Causes of Low Water Pressure Throughout Your Home
1. Main Water Valve Issues
Your home’s main water valve controls the overall water flow into your property. Sometimes, this valve can remain partially closed after maintenance work. A main valve left partly closed is a common cause of whole-house low water pressure. Check both your home’s shutoff valve (typically located near the foundation where water enters your home) and the municipal water meter valve.
2. Hard Water Buildup
Hard water is common in the Flathead Valley. High levels of minerals like calcium and magnesium in the water can accumulate in your pipes over time, gradually narrowing your pipes’ diameter, reducing water flow and pressure throughout your home. Installing a water softener can prevent future buildup and protect your plumbing system.
3. Failing Pressure Regulator
A pressure regulator is a control valve that reduces the incoming water pressure from municipal water lines to a safe level for your home. The Uniform Plumbing Code, which Montana adopted in its 2024 edition effective September 26, 2026, requires a pressure regulator where the water pressure coming into the home is more than 80 psi. When this device fails, it can cause either extremely high or low water pressure throughout your entire home. Not every home has a pressure regulator. Once a regulator is set, it should not need adjusting. If pressure swings between high and low with no middle ground, the regulator may need to be replaced.
4. Corroded Plumbing
Older homes with galvanized steel pipes often experience decreased water pressure due to internal corrosion and mineral buildup. The buildup gradually restricts water flow, leading to decreased pressure throughout the home.
Localized Water Pressure Issues
1. Clogged Aerators
If you’re experiencing low water pressure at a single faucet, the aerator might be clogged with mineral deposits. Soaking aerators in vinegar dissolves the minerals and help keep them clean. Many aerators can also be replaced if the buildup becomes severe.
2. Water Heater Problems
Low hot water pressure specifically can indicate issues with your water heater. Sediment buildup in the tank or problems with the shut-off valve are common culprits. Sediment buildup can significantly reduce water heater efficiency and pressure. Rheem suggests draining a few quarts from the tank every month to prevent buildup.
3. Leaking Pipes
Hidden leaks can cause pressure drops at specific fixtures or areas of your home. Signs of leaking pipes include:
- Unexplained increases in water bills
- Damp spots on walls or ceilings
- Musty odors
- Sound of running water when all fixtures are off
How to Narrow Down the Cause
First, make sure only one fixture is running. Two fixtures running at once split the water supply, so a shower loses pressure while the washing machine fills. If that is the only issue, wait until the washer finishes.
Next, note how far the problem reaches: one fixture, one room, one floor or the whole house. Knowing the scope helps trace the cause. Low pressure at a single fixture may have a simple cause, such as a leaky valve. Low pressure throughout the house may point to a more serious plumbing problem.
- Check every fixture: sinks, toilets, showers, tubs, the dishwasher, the washing machine, and outdoor faucets and hose hookups.
- Test hot and cold water separately at each fixture. If the pressure is low only on the hot side, the water heater is the likely cause.
- If a few related fixtures are low, rust, lime or sediment may be blocking them, or the fixtures may be worn out and ready for replacement.
Why Hire a Licensed Plumber?
While some water pressure issues can be diagnosed through visual inspection, many require professional expertise and specialized equipment to properly identify and repair. Here’s why you should trust the licensed plumbers at Central Heating Cooling Plumbing Electrical:
- Proper Diagnosis: A misdiagnosed plumbing problem can lead to costly secondary damage. Professional plumbers have the training and tools to accurately identify the root cause of pressure problems.
- Code Compliance: Licensed plumbers understand and adhere to local building codes and regulations. The Montana Department of Labor & Industry requires all plumbing work to meet strict safety and quality standards.
- Warranty Protection: Professional plumbing repairs typically come with warranties, protecting your investment and ensuring long-term peace of mind.
- Safety: Working with water systems can be dangerous and may involve electrical components, high-pressure lines, or contaminated water. Professional plumbers are trained in safety protocols and carry proper insurance.
Solving Low Water Pressure Problems
Don’t let low water pressure affect your daily routine. With 34 years of experience serving the Flathead Valley, Central Heating Cooling Plumbing Electrical’s licensed plumbers have the expertise to quickly diagnose and resolve your water pressure issues. Contact us today for service.
