Water Pressure Problems in Colorado Homes: Causes & Fixes

With dramatic elevation changes, hard water, and neighborhoods full of homes built in the early 1900s, water pressure problems are a common frustration for Colorado homeowners. If you’re dealing with weak showers, sputtering faucets, and toilets that take forever to refill, it can often be traced back to a specific issue within your plumbing system. Understanding what’s causing your pressure problem can help you take the steps toward restoring normal and determine whether it’s a simple fix or time to call the professionals at Sanders & Johnson.

Key Takeaways

• Water pressure problems in Colorado usually stem from the city’s elevation changes, hard water scale, and aging supply lines.
• Most homes should sit between 40 and 60 psi, with anything above 80 violating Colorado plumbing code.
• You can check your home’s water pressure using a hose bib pressure gauge from any hard water store.
• If your water pressure drops suddenly, affects every fixture, or rises above 80psi, it’s a clear sign of an underlying problem that requires professional repair from Sanders & Johnson.

What Is Normal Water Pressure for a House?

The normal water pressure for a house falls between 40 and 60 psi, with 50 being the comfortable target for most Front Range homes. Below 40 psi, you’ll start noticing weak showers and slow fixtures, while above 80 psi, you’re putting added stress on every joint and connection in the house and shortening the life of your entire plumbing system.

Any reading above 80 psi violates the Colorado Plumbing Code and requires homeowners to install a pressure-reducing valve to bring it back to a safe range. Most water heater and appliance warranties outline the same threshold, so running high pressure can even void your coverage. 

Why Denver and Front Range Homes Face Unique Water Pressure Challenges

Denver’s elevation, water chemistry, and century-old supply lines create unique water pressure challenges for local homeowners. Depending on the issue, your system’s pressure can either fall below the normal range or climb high enough to stress pipes, fixtures, and appliances.

Low water pressure problems

Curious what causes low water pressure in Front Range homes? The issue almost always comes from a restriction somewhere in your plumbing system. Some of the most common culprits that can leave you asking “why is water pressure low in my house” include:

• A partially closed main shutoff valve: Valves can get bumped during work or never fully reopened after a repair, causing a pressure drop throughout your house.
• Corroded supply lines: Many older homes in areas like Park Hill and Baker have aging galvanized supply lines that rust from the inside out and restrict flow.
• Mineral scale: Calcium and magnesium buildup on aerators and showerheads can cause low pressure at certain fixtures while the rest of your home runs normally.
• Hidden leaks: Undetected leaks in slabs or underground lines from Denver’s shifting clay soil or freeze-thaw cycles can cause water pressure to drop throughout your entire home. 

High water pressure problems

High water pressure problems often stem from your home’s location or the equipment installed. Because strong showers and powerful taps don’t stand out as a warning sign, these problems often go unnoticed until they cause a failing water heater or a burst supply line. 

Common causes include:

• Failing or absent PRV: Homes in lower elevation areas like Globeville and the Platte Valley need a properly sized PRV to keep pressure under 80 psi.
• Thermal expansion: Without an expansion tank, homes running on a closed system can spike up past their static reading every time a water heater turns on. 
• High municipal supply pressure: Some zones deliver water at over 80 psi right at the meter, which means the pressure was already high before it reached your plumbing. 

How to Check Your Home’s Water Pressure

You can perform a quick check of your home’s water pressure using a hose bib pressure gauge from your local hardware store. Here’s how:

• Step one: Find an outdoor hose bib or laundry tub faucet near where the water enters your house and attach the gauge hand-tight.
• Step two: Turn off your dishwasher, washing machine, ice maker, irrigation, and any running faucets so no water is moving through the system when measuring the pressure.
• Step three: Turn the valve all the way open and read the number on the gauge.
• Step four: Perform the test again at a different time of day to get a more accurate reading, since municipal pressure fluctuates throughout the day. 

When to Call a Plumber for Low Water Pressure

You need a plumber for low water pressure if your water pressure suddenly drops, the problem is affecting every fixture in your house, or the gauge reading doesn’t make sense for what you’re experiencing at the tap. Experienced professionals can perform a full pressure diagnostic and pinpoint the exact issue.

A few other warning signs that you need professional help include:

• Discolored or rusty-looking water.
• A pressure reading above 80 psi.
• Toilets that keep running or faucets that still drip after repair.
• Banging or knocking sounds from your pipes when a fixture turns off.

Schedule a Water Pressure Diagnostic with Sanders & Johnson

At Sanders & Johnson, we diagnose and repair water pressure problems across the Front Range. Our background-checked technicians have over 49 years of experience serving Colorado homes and can test your system, clearly explain what’s going on, and provide an honest, pressure-free estimate so you can make the right decision for your equipment.

Call us to learn more or schedule same-day service today! We proudly serve homes throughout Denver and surrounding Front Range communities, including:

• Lakewood
• Arvada
• Littleton
• Evergreen
• And more!

Frequently Asked Questions

How do I know if it’s my plumbing or the city’s water supply?

If the pressure at your outdoor hose bib reads normal but your indoor fixtures are weak, the problem is inside your plumbing. If the hose bib also reads low, the issue is likely stemming from your service line, meter, or municipal supply.

What is considered low water pressure in a house?

Anything below 40 psi is considered low water pressure in a house. Most homeowners start noticing warning signs around 45 psi, and once it falls below 30 psi, you’ll have trouble running two fixtures at once.

What is a pressure-reducing valve and do I need one in Denver?

A pressure-reducing valve is a bell-shaped fitting that’s installed on your main water line to bring down the municipal pressure to a safe level for your home. If your pressure is over 80 psi, which is common in lower-elevation areas of Denver like Globeville and Elyria-Swansea, you’ll need to install one to protect your water heater, appliances, and supply lines.

Can hard water cause low water pressure?

Hard water deposits scale inside aerators, showerheads, valves, and pipes, which restricts flow and causes water pressure to drop. Regular plumbing maintenance helps clear out any buildup and keep your pipes flowing freely.

Why is the pressure in my upstairs bathroom worse than downstairs?

The pressure in your upstairs bathroom is often worse than downstairs because of its position above the lower floor. You lose around 0.43 psi of water pressure for every foot of height.