What Causes Low Water Pressure, and How to Fix It

There’s nothing more frustrating than turning on your shower and getting only a weak trickle of water. Low water pressure is a common issue for homeowners in Oro Valley, and while it might seem minor, it often points to an underlying plumbing problem.

At 520 Plumbing LLC, we’ve helped countless homeowners in Oro Valley, Marana, and Northwest Tucson identify and fix the real causes behind poor water flow, from simple valve adjustments to full repipes. Here’s what you should know about why your water pressure may be low and how to get it back to normal.

1. Hard Water and Mineral Buildup

Oro Valley’s water supply is known for being hard, which means it contains high levels of minerals such as calcium and magnesium. Over time, these minerals can build up inside your pipes and fixtures, restricting water flow.

How to fix it:
Remove and clean shower heads and faucet aerators with vinegar to dissolve buildup.
If buildup happens often, consider installing a whole-home water softener to protect your plumbing system and improve water pressure.

2. Partially Closed Main Water Valve

If your home’s main shut-off valve isn’t fully open, it can cause low pressure throughout the house, especially after plumbing work or maintenance.

How to fix it:
Find your home’s main shut-off valve, usually located near your water meter or where the main line enters your home, and ensure it’s fully open. If you’re unsure, a licensed plumber from 520 Plumbing can help you locate and check it safely.

3. Faulty Pressure-Reducing Valve (PRV)

Many Oro Valley homes are equipped with a pressure-reducing valve, which regulates the flow of water from the municipal line. When these valves wear out, they can cause either very low or very high water pressure.

How to fix it:
If your water pressure suddenly drops, your PRV may need to be adjusted or replaced. Our experienced plumbers can test your home’s pressure and replace the valve if needed.

4. Leaks in Your Plumbing System

Even a small leak can reduce water pressure across your entire home, and Oro Valley’s clay-rich soil can make underground leaks harder to spot.

Signs of a hidden leak include:
Unexplained increases in your water bill, wet spots or cracks in flooring or walls, and hissing or dripping sounds when water isn’t running.

How to fix it:
Turn off all water fixtures and check your water meter. If it’s still spinning, you likely have a hidden leak. 520 Plumbing LLC can assist in leak detection and repair for Oro Valley homes, saving you from costly water damage.

5. Corroded or Aging Pipes

Older homes in Oro Valley, particularly those built before the early 1980s, may still have galvanized or polybutylene pipes that corrode and restrict water flow over time.

How to fix it:
If you’re noticing low pressure in multiple areas, it may be time to repipe your home with modern materials such as copper or PEX. This upgrade improves both water pressure and overall plumbing reliability.

6. Issues with Oro Valley’s Municipal Water Supply

Sometimes, the issue isn’t inside your home at all. The Town of Oro Valley or Tucson Water, depending on your service area, may be performing maintenance or system flushes that temporarily reduce pressure.

How to fix it:
Check your provider’s website or community notices for any ongoing maintenance before scheduling a service call.

🛠️ When to Call a Professional Plumber

If you’ve ruled out simple fixes and your water pressure is still low, it’s time to call a professional. A licensed Oro Valley plumber can test your home’s water pressure, inspect PRVs, detect hidden leaks, flush lines to clear sediment buildup, and recommend long-term solutions such as repiping or softener installation.

Restore Water Pressure with 520 Plumbing LLC

At 520 Plumbing LLC, we’re a veteran-owned, licensed, bonded, and insured plumbing company serving Oro Valley, Marana, and Northwest Tucson. Whether your water pressure issue is caused by a small leak, old pipes, or a faulty regulator, our experienced team will get your water flowing strong again.

📞 Call or text (520) 328-5846 today.

We’re here to bring reliable, professional plumbing service to Oro Valley homeowners, done right the first time.