Phoenix Heatwave: Is Copper Tap Drying Cycles?

By Franklin Everett Shaw

November 8, 2025

The relentless Arizona sun isn’t just tough on your skin; it’s a silent aggressor against your home’s plumbing, especially if you have copper pipes. Those pipes, the veins of your house, are vulnerable to the extreme temperature swings that Phoenix throws at them. But how do you know if that “drying cycle” sound you hear during a heatwave is normal expansion and contraction, or a sign of something sinister brewing beneath your slab? Let’s dive into the specifics of diagnosing copper pipe issues in the Phoenix heat.

First, let’s understand what a “drying cycle” sound even is. It’s that ticking, clicking, or even groaning noise you might hear coming from your walls or under your floors, particularly during the hottest parts of the day and as things cool down at night. This is often attributed to the expansion and contraction of copper pipes as they heat up and cool down. While some of this is normal, excessive or unusual noises can indicate problems.

Here’s a step-by-step guide to help you determine if your copper pipes are just singing the heatwave blues, or if they’re crying out for help:

Listen Carefully and Locate the Source: Don’t just dismiss the noise. Try to pinpoint where it’s coming from. Is it localized to one area of the house, or is it widespread? Does it seem to be coming from a specific pipe run? The more information you gather, the better.
Check for Obvious Leaks: This might seem obvious, but it’s crucial. Look for any signs of water damage around pipe access points, under sinks, and near appliances that use water. Even a small, slow leak can exacerbate problems during a heatwave. Remember, evaporation is rapid in Phoenix, so a leak might not be immediately obvious.
Assess Water Pressure: Fluctuations in water pressure can stress copper pipes, especially when combined with high temperatures. Check your water pressure at different times of the day. If you notice significant drops or surges, it could indicate a problem with your main water line, pressure regulator, or even mineral buildup within the pipes. A simple pressure gauge, available at most hardware stores, can help you with this.
Inspect Exposed Pipes: If you have any exposed copper pipes (e.g., in your garage or basement, if applicable), visually inspect them. Look for signs of corrosion, discoloration (especially green or blue), or bulging. These are all red flags.
The "Flush Test": This is a simple test to check for mineral buildup. Run water in a seldom-used faucet (like an outdoor spigot) for several minutes. If the water initially comes out discolored or with sediment, it suggests mineral deposits are present in your pipes. Phoenix water is notoriously hard, so mineral buildup is a common issue.
Consider the Age of Your Pipes: Older copper pipes are more susceptible to problems. If your home was built before, say, 1980, your pipes might be nearing the end of their lifespan.

Now, let’s talk about mineral buildup, a major culprit in Phoenix plumbing problems. The hard water in the Valley of the Sun is rich in minerals like calcium and magnesium. Over time, these minerals can accumulate inside your copper pipes, reducing water flow and creating hot spots that weaken the metal. This buildup also increases the likelihood of leaks, especially during temperature extremes.

Challenges and Pitfalls:

Ignoring the Problem: The biggest mistake Phoenix homeowners make is dismissing the “drying cycle” sound as normal. Don’t ignore it! Early detection can save you from costly repairs down the line.
DIY Repairs Without Expertise: Copper pipe repair requires specialized skills and tools. Attempting to fix a leak yourself without the proper knowledge can make the problem worse.
Using the Wrong Materials: Not all plumbing materials are created equal. In Phoenix, it’s crucial to use materials that are resistant to hard water and high temperatures.

When to Call a Plumber (and What to Look For):

If you observe any of the following, it’s time to call a licensed plumber specializing in copper pipes in desert climates:

Persistent or worsening “drying cycle” sounds.
Visible leaks or water damage.
Significant water pressure fluctuations.
Discolored water or sediment in your water.
Corrosion or damage to exposed pipes.

When choosing a plumber, ask about their experience with copper pipes in Phoenix and their knowledge of local water conditions. Don’t be afraid to get multiple quotes.

Preventative Measures:

Water Softener: Installing a water softener can significantly reduce mineral buildup in your pipes. This is a worthwhile investment for any Phoenix homeowner.
Insulate Exposed Pipes: Insulating exposed copper pipes can help regulate their temperature and reduce stress.
Regular Plumbing Inspections: Schedule regular plumbing inspections to catch potential problems early.
Consider PEX Piping for Replacements: When replacing sections of copper pipe, consider using PEX (cross-linked polyethylene) piping. PEX is more flexible, resistant to freezing, and less prone to mineral buildup.

Arizona State-Specific Rebate Programs:

Arizona offers several rebate programs to encourage water conservation. While not directly targeted at copper pipe maintenance, some programs can help you upgrade your plumbing system to be more water-efficient, which can indirectly benefit your pipes. Check the Arizona Department of Water Resources website and your local city’s water department for information on available rebates for things like:

Low-flow toilets: Reducing water usage can lessen the strain on your pipes.
Water-efficient appliances: Similar to low-flow toilets, these appliances reduce overall water consumption.
Smart irrigation controllers: These controllers help prevent overwatering, which can contribute to soil erosion and foundation problems that can affect your plumbing.

Don’t let the Phoenix heat turn your copper pipes into a ticking time bomb. By understanding the signs of trouble, taking preventative measures, and knowing when to call a professional, you can protect your home’s plumbing and avoid costly repairs. Remember, a little proactive maintenance can go a long way in the Arizona desert.