Published: January 30, 2026 | Category: Burst Pipe & Leaks | Reading time: 10 minutes
Opening your water bill to find an unexpectedly high amount is an unpleasant surprise that many Lawrenceville homeowners experience. While rates do increase over time, a sudden spike in your water bill usually indicates a problem that needs attention. Understanding the common causes can help you identify the issue quickly and prevent water waste that is costing you money every month.
How Much Is Too Much?
The average Lawrenceville household uses about 3,000 to 6,000 gallons of water per month, though this varies based on family size and water habits. If your usage has suddenly jumped by 30% or more without a clear reason, something is likely wrong. A bill that is double or triple your normal amount almost certainly indicates a significant leak or malfunction.
Before investigating, check whether your water utility has recently raised rates. Compare the gallons used on your current bill to previous months, not just the dollar amount. This tells you whether you are actually using more water or simply paying higher rates.
Hidden Leaks: The Most Common Culprit
Undetected water leaks are the leading cause of unexpectedly high water bills. Even small leaks can waste surprising amounts of water over time.
How Much Water Can a Leak Waste?
Consider these startling statistics from the EPA:
- A faucet dripping once per second wastes over 3,000 gallons per year
- A showerhead leaking 10 drips per minute wastes over 500 gallons per year
- A toilet running constantly can waste up to 200 gallons per day
- A slab leak can waste thousands of gallons per month
Even a small hidden leak can easily add $50 to $100 or more to your monthly water bill while remaining invisible to daily observation.
Where Hidden Leaks Typically Occur
- Under slabs and foundations - Slab leaks are invisible but can waste enormous amounts of water
- Behind walls - Pipe joints or corroded sections may leak into wall cavities
- In crawl spaces - Pipes running through crawl spaces can leak undetected
- Underground supply lines - The line from the meter to your home can develop leaks
- Water heater tanks - Slow leaks may go into a drain pan or evaporate
Running Toilets: The Silent Money Drainer
A running toilet is one of the most common and most costly sources of water waste in Lawrenceville homes. The problem is that a toilet can run continuously without making obvious noise, especially if the water level in the tank is just slightly too high.
Testing for a Running Toilet
Perform this simple test on each toilet in your home:
- Remove the tank lid and add several drops of food coloring to the water
- Wait 15-20 minutes without flushing
- Check the toilet bowl - if colored water appears, your flapper is leaking
A faulty flapper valve is the most common cause of running toilets and is an inexpensive fix. However, fill valve problems, overflow tube issues, and chain problems can also cause continuous running.
Irrigation System Problems
If you have an underground sprinkler system, it could be responsible for your high water bill. Irrigation systems use large volumes of water, so even small problems can significantly impact your bill.
Common Irrigation Issues
- Broken sprinkler heads - Damaged heads may spray continuously or leak underground
- Leaking underground pipes - Pipes between zones can crack or separate
- Malfunctioning valves - Zone valves that do not close completely allow continuous flow
- Controller problems - Timers may be set incorrectly or running extra cycles
- Improper scheduling - Watering too frequently or during heat of day wastes water
Check your irrigation controller settings and walk your property while the system runs to look for obvious problems like geysering heads or soggy areas.
Professional Leak Detection Services
Cannot find the source of your high water bill? Our professional leak detection services use advanced equipment to find hidden leaks quickly.
Leak Detection ServicesWater Meter and Billing Issues
Sometimes the problem is not with your plumbing at all. While rare, water meters can malfunction, and billing errors do occur.
Testing Your Water Meter
To determine if water is actually flowing through your meter when it should not be:
- Turn off all water fixtures in your home, including icemakers
- Locate your water meter (usually near the street or in a meter box)
- Watch the meter's leak indicator (often a small triangle or dial)
- If the indicator moves when all water is off, you have a leak
- If the indicator does not move but your bill is high, request a meter test
Most water utilities will test your meter for accuracy if you request it, though you may be charged if the meter turns out to be accurate.
Other Causes of High Water Bills
Water Softener Malfunction
If you have a water softener, it goes through regeneration cycles that use water. A malfunctioning softener may regenerate too frequently or continuously, wasting hundreds of gallons. Listen for constant cycling or check your softener's settings.
Water Heater Issues
A water heater with a faulty temperature and pressure relief valve may release water continuously. Check for water around the base of your water heater or at the discharge pipe.
Recent Changes in Usage
Consider whether any of these factors have changed recently:
- More people in the household
- Guests staying for extended periods
- New appliances that use more water
- Filling a swimming pool or hot tub
- Landscaping changes requiring more irrigation
- Seasonal changes in watering needs
What to Check First
Follow this troubleshooting checklist to identify the source of your high water bill:
- Check all toilets - Use the food coloring test on every toilet
- Inspect visible pipes - Look under sinks, around the water heater, and in the basement
- Check faucets and showerheads - Even small drips add up
- Monitor your water meter - With all water off, check for movement
- Inspect irrigation system - Run each zone and watch for problems
- Look for wet spots - Check the yard, walls, and floors for unexplained moisture
- Listen for running water - At night when the house is quiet
When to Call a Professional Plumber
If you have checked the obvious sources and still cannot identify the problem, it is time to call a professional. Hidden leaks behind walls, under slabs, or underground require specialized detection equipment.
Professional plumbers use electronic leak detection equipment, thermal imaging, and acoustic listening devices to pinpoint leaks without destructive investigation. The cost of professional detection is often far less than the cost of continued water waste and potential water damage.
Frequently Asked Questions
How much does a small leak really affect my bill?
A single dripping faucet can add $20-$50 per year to your bill. A running toilet can add $100-$200 per month. A slab leak or underground pipe leak can add hundreds of dollars monthly. The larger the leak, the faster costs accumulate.
Will my water company notify me of unusually high usage?
Many utilities now have systems that flag unusual usage patterns, but not all do. Smart meters can provide real-time data and alerts. Contact Gwinnett County or your local water provider to ask about usage alerts or online monitoring tools.
Can I get an adjustment on my bill if I had a leak?
Some water utilities offer leak adjustments if you can prove the leak has been repaired. Policies vary, so contact your water provider. Typically, you will need a plumber's invoice or other documentation of the repair.
How much does professional leak detection cost?
Leak detection services in Lawrenceville typically cost $150-$400 depending on the complexity and equipment needed. Many plumbers waive or reduce the detection fee if you hire them for repairs. The investment is worthwhile compared to continued water waste.
Frequently Asked Questions
Why did my water bill suddenly increase?
The most common cause is a running toilet, which can waste up to 200 gallons a day almost silently. Other frequent causes are a hidden leak in a supply line, an irrigation system fault, a failed water softener, or a leak in the service line between the meter and the house.
How do I check for a hidden water leak?
Turn off every fixture and appliance, then check your water meter. Note the reading or watch the small leak indicator dial, wait 30 minutes without using water, and check again. Any movement means water is escaping somewhere on your side of the meter.
How much water does a running toilet waste?
Up to 200 gallons a day, which is several thousand gallons over a billing cycle. Test it by adding food colouring to the tank without flushing and waiting 20 to 30 minutes. If colour appears in the bowl, the flapper is leaking and needs replacing.
Can a leak be underground and invisible?
Yes, and Georgia red clay hides them well because it absorbs water without the surface pooling you would see in sandy soil. Signs are an unusually green or soggy strip in the yard, a drop in pressure across the whole house, and a meter that keeps moving with everything off.
Should the water company adjust my bill for a leak?
Many utilities offer a one time leak adjustment if you can show the leak was repaired promptly by a licensed plumber. Keep the invoice and any detection report, and ask about their adjustment policy. It is not automatic, so you generally have to request it.