Published by Craftsman Plumbing
A high water bill is almost always caused by a plumbing problem, and the most common culprits are running toilets, leaky faucets, and hidden pipe leaks that can waste 10,000 gallons or more each month. This article covers the specific plumbing issues that drive up water costs, how to spot them, and what Dallas-area homeowners should do to get them fixed fast.
Identify the Most Common Plumbing Causes of a High Water Bill
Most spikes in water usage trace back to just a handful of plumbing problems. Knowing which ones to check first saves you time and money.
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Running toilet: A faulty flapper or fill valve can silently waste 200 to 400 gallons per day.
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Dripping faucet: A faucet dripping once per second wastes about 3,000 gallons per year.
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Leaking supply lines: The lines under sinks and behind appliances can crack and drip constantly.
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Slab leak: A pipe leak beneath your concrete foundation can go undetected for months while soaking the soil.
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Irrigation system leaks: Broken sprinkler heads or cracked irrigation lines are a leading cause of high bills in North Dallas neighborhoods.
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Water heater issues: A faulty pressure relief valve can discharge water continuously without any visible sign.
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Old or worn fixtures: Aging fixtures throughout the home add up to significant daily waste.
If your bill jumped by 30 percent or more in a single month and you have not changed your habits, one of the issues above is almost certainly the reason.
Understand How Much Water Common Plumbing Leaks Actually Waste
It helps to put real numbers behind each type of leak. The table below shows estimated daily and monthly water waste for the most frequent plumbing problems.
Dallas Water Utilities charges residential customers roughly $4 to $6 per 1,000 gallons depending on usage tier. A moderate irrigation leak can push you into a higher billing tier very quickly.
Frisco and Plano residents served by the North Texas Municipal Water District also face tiered pricing. Moving into a higher tier can double the per-gallon rate, meaning a single broken sprinkler head hits your bill harder than you might expect.
Check Your Toilet First When Asking Why Is My Water Bill So High Plumbing
Toilets account for nearly 30 percent of indoor water use, and a faulty flapper is the single most common reason why is my water bill so high plumbing complaints come up. The good news is that checking your toilet takes about 60 seconds.
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Remove the tank lid and add several drops of food coloring to the tank water.
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Wait 10 to 15 minutes without flushing.
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Look into the bowl. If color appears, your flapper is leaking.
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Also listen for a hissing sound after the tank fills. That points to a faulty fill valve.
A replacement flapper costs $5 to $15 at any hardware store and takes less than 10 minutes to swap out. If the fill valve is the problem, a full replacement kit runs $20 to $40.
If the problem persists after replacing those parts, the issue could be a cracked overflow tube or an older toilet that no longer seals properly. At that point, calling a licensed plumber is the right move.
Recognize the Warning Signs of a Slab Leak in Dallas Homes
Slab leaks are a serious concern throughout the Greater Dallas area, including neighborhoods like Lakewood, Preston Hollow, Richardson, and throughout Frisco and Plano. The expansive clay soil in North Texas shifts significantly with seasonal moisture changes, putting extra stress on copper and galvanized pipes embedded in concrete slabs.
A slab leak can silently waste hundreds of gallons daily with no visible drip anywhere in your home.
Watch for these warning signs:
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Warm or hot spots on your floor, especially on tile or hardwood
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The sound of running water when all fixtures are turned off
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Cracks developing in interior walls or the foundation
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Mold or mildew smell near baseboards without a visible moisture source
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Significantly higher water bills with no explanation
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Wet or damp carpet in a room that has never flooded
Craftsman Plumbing uses electronic leak detection equipment to locate slab leaks without unnecessary demolition. Early detection keeps repair costs far lower than waiting until structural damage sets in.
Compare Repair Costs for Common High-Bill Plumbing Issues
Understanding what repairs actually cost helps you budget and make informed decisions. The table below reflects typical pricing in the Dallas metro area, including Plano, Frisco, Garland, Irving, and surrounding communities.
Slab leak repair costs vary widely based on pipe access, depth, and method. Pipe rerouting is often more cost-effective than breaking up the slab, and a licensed plumber can help you choose the right approach for your home.
Inspect Your Irrigation System Before Summer in North Texas
Irrigation and sprinkler leaks are one of the top reasons homeowners in Frisco, Plano, Carrollton, Coppell, and Addison see their water bills spike dramatically from April through September. North Texas summers are long and hot, and irrigation systems run frequently.
A single broken sprinkler head can dump 25 gallons per minute. Run a zone for 20 minutes twice a week and that adds up to over 4,000 gallons wasted weekly from one broken head.
Do a quick seasonal inspection before you start running your system regularly:
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Turn on each zone manually and walk the full coverage area while it runs.
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Look for heads spraying sideways, geysering straight up, or not rotating correctly.
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Check for soggy patches or standing water after a dry period, which points to underground line leaks.
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Verify that your irrigation controller is set to appropriate seasonal run times and not stuck on a summer schedule year-round.
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Have a plumber or irrigation specialist check the backflow preventer annually. Texas regulations require tested backflow prevention devices on irrigation systems.
Craftsman Plumbing helps homeowners across the North Dallas area identify and repair irrigation-related leaks that inflate water bills every season.
FAQs on Why Is My Water Bill So High Plumbing
How do I know if a plumbing leak is causing my high water bill?
Turn off all water-using appliances and fixtures in your home, then check your water meter. If the meter dial or digital display is still moving, you have an active leak somewhere in your system. Mark the reading, wait two hours without using any water, then check again. Any change confirms a leak.
Can a running toilet really make my water bill that high?
Yes, absolutely. A toilet with a faulty flapper can waste 200 to 400 gallons every single day without making any noise loud enough to notice. Over a 30-day billing cycle, that is 6,000 to 12,000 gallons of pure waste. It is one of the most overlooked reasons for a high bill.
What is a slab leak and how common is it in Dallas?
A slab leak is a break or crack in a water line that runs beneath your home’s concrete foundation. It is very common in the Dallas metro area because the heavy clay soil expands and contracts with rain and drought cycles, stressing pipes over time. Older homes in areas like Highland Park, Lakewood, and Garland are especially prone to slab leaks.
Will my water company adjust my bill if I had a plumbing leak?
Many North Texas water utilities, including Dallas Water Utilities and the cities of Plano and Frisco, offer a one-time leak adjustment credit if you can show documented proof that a plumbing leak caused abnormal usage. You typically need a repair receipt from a licensed plumber and a written request submitted within a specific window after the bill date. Call your utility provider to ask about their specific policy.
How often should I have my plumbing inspected to prevent surprise high bills?
A plumbing inspection every one to two years is a smart preventive measure for most Dallas-area homeowners, especially those in older homes or homes with irrigation systems. Annual inspections can catch slow leaks, corrosion, and worn components before they become expensive problems. Many homeowners schedule inspections in the spring before peak irrigation season begins.
Can a water heater cause a high water bill?
Yes. A pressure relief valve on a water heater can open and discharge water if the heater is overheating or the valve has worn out. The discharge pipe usually runs to a floor drain, so you may never see the water loss. If your water heater is running more than usual or making odd noises, have a plumber inspect the pressure relief valve and thermostat.
Wrap Up and Next Steps
A high water bill almost always points to a fixable plumbing problem. Running toilets, leaky faucets, broken irrigation lines, and slab leaks are the most common culprits, and catching them early saves you both water and money.
If you are in the Dallas area, including Frisco, Plano, Carrollton, Irving, Rowlett, or anywhere else in the Greater Dallas Metroplex, Craftsman Plumbing can diagnose and repair the issue fast.
Call Craftsman Plumbing at 214-444-9816 to schedule a leak inspection or plumbing check today. Do not wait another billing cycle to find out what is draining your wallet.