A sudden spike in your water bill can be alarming, especially when your daily usage hasn’t changed. In most cases, a high water bill is more than just a fluke — it’s a sign of a hidden plumbing issue silently wasting water behind your walls, under your floors, or even beneath your home’s foundation. Homeowners across Southern California, from Los Angeles to Orange County, often face these hidden leaks due to aging pipes and shifting soil.

Understanding the root causes of your high water bill and knowing how to detect leaks early can save you thousands of dollars in wasted water and potential repairs. Let’s explore the common causes, tell-tale signs, and the best ways to solve these hidden problems before they worsen.

Common Causes of a High Water Bill in Southern California

Hidden leaks aren’t always easy to spot. Some can run for weeks or even months before they become visible. Here are a few common culprits that could be driving up your water costs:

1. Slab Leaks Under the Foundation

In many Southern California homes, particularly those built on concrete slabs, leaks can develop in the pipes beneath the foundation. These slab leaks are often caused by pipe corrosion, shifting soil, or high water pressure. Because they’re underground, the only early warning signs may be warm spots on the floor, damp carpet, or an unexplained rise in your water bill.

Pro Tip: A slab leak can waste thousands of gallons of water every month. Early leak detection can prevent structural damage and save you thousands in repair costs.

2. Silent Toilet Leaks

That faint hiss from your toilet tank could be costing you hundreds of dollars. A worn or misaligned toilet flapper can allow water to run continuously into the bowl without a sound. Over a month, this can account for thousands of wasted gallons — contributing to a high water bill.

Try this: Add a few drops of food coloring to your toilet tank. If color appears in the bowl after 15 minutes (without flushing), you have a leak.

3. Irrigation Line Leaks

Southern California’s dry climate means sprinklers and irrigation systems work overtime. Unfortunately, leaks in underground sprinkler lines or fittings often go unnoticed because they happen outdoors. Look for soggy patches, unusually green spots on your lawn, or a continuously running pump.

4. Dripping Faucets and Outdoor Spigots

It may seem minor, but a dripping faucet or outdoor spigot can waste more water than you think. A single faucet dripping once per second can waste over 3,000 gallons in a year. Check faucets, garden hoses, and outdoor connections regularly — especially after freezing or hot spells.

5. Pinholes in Copper Pipes

Many older Southern California homes feature copper piping, which can corrode over time. Small pinhole leaks often form inside walls or ceilings, slowly releasing water and driving up your water usage. If you notice low water pressure, discoloration in your walls, or strange water sounds, it might be time to call for pipe repair services.

How to Troubleshoot and Detect Hidden Plumbing Leaks

Before scheduling an inspection, try these quick steps to confirm a potential hidden water leak:

If these steps suggest a leak but you can’t find the source, it’s time to call an expert in leak detection near you.

Why Professional Leak Detection Matters

At A-1 Performance Rooter & Plumbing, we use advanced leak detection technology to locate hidden leaks with pinpoint accuracy — without unnecessary digging or damage. Our experienced technicians service homes and businesses across Los Angeles, Orange County, Long Beach, and surrounding Southern California areas.

With specialized equipment like acoustic sensors and thermal imaging, we can identify everything from slow pinhole leaks to major slab leaks, ensuring you get fast and lasting repairs.

Benefits of Professional Leak Detection:

Prevent Future High Water Bills

Once leaks are fixed, take steps to keep your water bill in check:

Conclusion: Don’t Ignore That High Water Bill

If your water bill has suddenly spiked, it’s usually not a coincidence — it’s the hidden plumbing issue you can’t see. From slab leaks under your foundation to silent toilet leaks, catching these problems early prevents costly damage and saves water in the process.

For fast, professional leak detection and slab leak repair in Southern California, call the trusted experts at A-1 Performance Rooter & Plumbing. Our licensed plumbers are available throughout Los Angeles, Orange County, Long Beach, and beyond.

Call us today at 800-997-3090 for expert leak detection and repair services to get your water bill — and your plumbing — back under control!