You open your water bill in July and do a double-take. It is higher than usual, maybe a lot higher, and you cannot quite figure out why. You are not doing anything differently. Or are you?

Summer is one of the most common times for water bills to creep up, and most homeowners do not realize how many small things add up. The good news is that most causes are fixable, and some are easier to catch than you might think.

Why Water Usage Goes Up in the Summer

Before assuming something is wrong, it helps to understand why summer naturally drives higher water use. Lawn and garden watering, car washing, filling pools or sprinklers, and more frequent showers after outdoor activity all add up fast.

But when your bill jumps significantly, and you cannot explain it with lifestyle changes, that is when it is worth taking a closer look.

Common Plumbing Culprits Behind a High Summer Water Bill

A Running Toilet

A constantly running toilet can waste hundreds of gallons a day without making much noise. It is one of the most common and most overlooked causes of a high water bill. If you hear a faint trickling sound after flushing, that is your first clue.

A Leaking Hose Bib

Outdoor spigots take a beating in summer. A worn washer or loose connection on a hose bib can drip continuously, especially when a hose is left connected for long periods. Check your outdoor faucets and look for soft or damp soil around the base.

An Irrigation System Leak

If you have an in-ground sprinkler system, a cracked line or misaligned head can push a significant amount of water into your yard, or under it, without you ever noticing. Unusually green patches of grass can be a sign something is leaking underground.

A Slow Leak Inside the Home

Slow leaks under sinks, behind toilets, or at pipe joints are easy to miss until the bill arrives. A quick check under all your sinks and around your water heater can sometimes catch these before they turn into bigger problems.

An Aging or Inefficient Water Heater

Summer means more showers, more laundry, and more demand on your water heater. If your unit is older or not running efficiently, it may be working harder than it needs to, which shows up in both your water and energy bills.

How to Check If You Have a Leak

Here is a simple test. Turn off every water source in your home, including appliances, faucets, and irrigation. Then check your water meter. If the dial is still moving, water is going somewhere it should not be.

This does not tell you where the leak is, but it confirms one exists and gives you a good reason to call a plumber before the next bill arrives.

Small Fixes That Can Lower Your Bill

Not every spike requires a major repair. A few simple changes can make a noticeable difference:

  • Fix running toilets promptly; the flapper is usually the culprit and is inexpensive to replace
  • Check hose connections before and after heavy use
  • Water your lawn in the early morning to reduce evaporation
  • Install a low-flow showerhead if your household is showering more frequently

Why Seattle & Lynnwood Homeowners Trust Service Plumbing & Heating

Service Plumbing & Heating has been serving the Greater Seattle area for over 35 years, handling everything from minor leaks to full repiping and water heater replacement. Our team works with both residential and commercial clients across Seattle, Shoreline, Lynnwood, Bellevue, Kirkland, and surrounding communities.

What sets us apart is straightforward, honest service. No unnecessary upsells, no guesswork. Just experienced plumbers who show up, diagnose the problem correctly, and fix it right the first time. That reputation has made us a trusted name throughout Snohomish and King County for decades.

If your water bill has you scratching your head this summer,we are the team to call.

Contact Service Plumbing & Heating in the Greater Seattle Area

A high water bill is your home telling you something is off. The sooner you get it checked out, the sooner you can stop paying for water that is going to waste.

Request a Quote

Service Plumbing & Heating proudly serves Seattle, Shoreline, Lynnwood, Bellevue, Kirkland & the surrounding Greater Seattle area.

related news & insights.

  • April 1, 2026||Plumbing||2.6 min||

    How to Spot a Hidden Plumbing Leak Before It Becomes a Big Problem

  • March 1, 2026||Plumbing||3.9 min||

    How to Spot a Water Leak Before It Becomes a Costly Repair