If you live in Denver, Colorado, chances are you’ve experienced plumbing issues due to mineral buildup or hard water. One part of your system especially vulnerable to these problems is the pressure relief valve on your water heater.

This small valve has a big job—releasing pressure if it gets too high. But over time, it can clog, stick, or corrode. Regular cleaning keeps it working and your home safe.

In this blog, we’ll walk you through how to clean a pressure relief valve, explain the common causes of valve issues, and highlight why expert heater service from a plumber in denver Colorado is essential.

What Does the Pressure Relief Valve Do?

The temperature and pressure relief (T&P) valve is a safety feature found on all water heaters. If your system builds up too much pressure, the valve opens to release it. Without this mechanism, your water heater could burst.

Unfortunately, in cities like Aurora, Thornton, and Commerce City, the valve can easily get clogged due to mineral-rich water. That’s why cleaning the valve is a key part of heater maintenance.

Why Do Relief Valves Need Cleaning?

Let’s start with the common causes of valve problems:

1. Mineral Buildup

Denver is known for hard water. Over time, minerals like calcium and magnesium collect in the valve, restricting flow.

2. Sediment Blockage

If your water heater hasn’t been flushed regularly, sediment can block the valve and stop it from releasing pressure.

3. Corrosion

Moisture, air, and minerals lead to rust, which can damage the valve spring or make the mechanism stick.

4. Thermal Cycling

Constant heating and cooling weakens the valve’s parts, especially if debris is present.

If you're experiencing constant leaks or strange noises from your valve, it's time for a clean—or even a replacement from a trusted plumber in Denver Colorado.

Cities in Denver, Colorado with Frequent Valve Issues

Water conditions and heater maintenance patterns in several cities make them prone to valve issues:

  • Aurora – Hard water accelerates mineral buildup in valves

  • Lakewood – Older heaters suffer from sediment clogs

  • Thornton – Fluctuating water pressure strains the valve

  • Commerce City – High corrosion rates in older systems

  • Golden – Poor flushing habits lead to valve sticking

  • Arvada – Excess pressure leads to premature valve failure

  • Englewood – Worn-out valves are common in historic homes

If you live in any of these areas, your valve may already be compromised.

How to Clean a Pressure Relief Valve: Step-by-Step

Cleaning your relief valve doesn’t require specialized tools, but it does require care. Follow these steps for a safe and effective clean.

Step 1: Turn Off Power and Water

  • For electric heaters: Turn off the power at the breaker box

  • For gas heaters: Switch the thermostat to “Pilot”

  • Turn off the cold water supply valve going into your water heater

Step 2: Let the Tank Cool

Wait at least 2 hours. This prevents burns from hot water or steam during cleaning.

Step 3: Locate the Valve

It’s typically found near the top or side of the water heater. Look for a small brass valve with a lever on top.

Step 4: Open the Valve

Place a bucket underneath the discharge pipe. Lift the lever gently—water should pour out. If nothing comes out, or it trickles slowly, the valve is likely clogged.

Step 5: Flush Debris

Lift and release the lever several times. This can dislodge mineral deposits or rust. You might see white flakes or brown water—this is normal and shows debris is being cleared.

Step 6: Remove and Soak (Optional)

For deep cleaning, turn off water at the main shut-off valve. Unscrew the valve using a wrench. Soak it in vinegar for 30 minutes to dissolve limescale. Rinse thoroughly.

Note: If unsure, call a licensed plumber in Denver Colorado to remove the valve for you.

Step 7: Reinstall the Valve

Apply Teflon tape on threads before screwing the valve back in place. Ensure it’s snug but not overtightened.

Step 8: Turn Everything Back On

  • Turn the cold water back on

  • Restore power or set the gas control to “On”

  • Let the tank refill and heat before testing the valve again

When Cleaning Isn't Enough

Sometimes, a pressure relief valve is too far gone. Here’s when to replace the valve instead of cleaning it:

  • It’s leaking constantly

  • Rust or corrosion is visible

  • Water pressure remains erratic after cleaning

  • You hear grinding or hissing noises

  • The valve won’t reset or open manually

If you’re unsure, call for heater service from a professional plumber in Denver Colorado. They’ll inspect your system and replace faulty parts safely.

Preventive Maintenance Tips

You can reduce future valve issues with these simple maintenance practices:

1. Annual Water Heater Flush

Flush your tank every 12 months to remove sediment and prolong heater life.

2. Bi-Annual Valve Test

Lift the valve lever twice a year to keep the mechanism moving freely.

3. Install a Water Softener

A softener helps reduce mineral deposits in cities like Golden, Lakewood, and Aurora.

4. Schedule Professional Inspections

Even if your heater seems fine, a yearly check-up from a plumber in Denver Colorado can catch early signs of valve failure.

Final Thoughts

Cleaning your pressure relief valve is a crucial part of heater service—especially in areas like Denver, Colorado, where hard water is common. Neglecting this task can lead to poor performance, leaks, or dangerous pressure buildup.

Knowing how to clean a pressure relief valve gives you control over your system’s safety and efficiency. But if you're unsure or spot damage, don’t risk it—contact a licensed plumber in Denver Colorado for a full inspection or valve replacement.